- 1 Class 10 Science Chapter 6 Important Questions with Answers Life Processes
- 1.1 Life Processes Class 10 Important Questions Very Short Answer Type
- 1.2 Life Processes Class 10 Important Questions Short Answer Type I
- 1.3 Life Processes Class 10 Important Questions Short Answer Type II
- 1.4 Life Processes Class 10 Important Questions Long Answer Type
Solved the very best collection of Life Processes Class 10 Science Important Questions and Answers Chapter 6 Pdf from the latest NCERT edition books, It will help you in scoring more marks in CBSE Exams.
Class 10 Science Chapter 6 Important Questions with Answers Life Processes
Class 10 Chemistry Chapter 6 Important Questions with Answers Life Processes
Life Processes Class 10 Important Questions Very Short Answer Type
Name the form in which the energy derived from the food is stored in humans. (2014)
Chemical energy (ATP).
Define photosynthesis. (2015)
The process by which green plants make their own food (like glucose) from carbon dioxide and water by using solar energy in the presence of chlorophyll is called photosynthesis.
Life Processes Class 10 Important Questions Short Answer Type I
Why do herbivores have longer, small intestine than carnivores? (2014)
The length of the small intestine differs in various animals depending on the type of food they eat. Cellulose is a carbohydrate food which is digested with difficulty. So the herbivorous animals like cows which eat grass need a longer small intestine to allow the cellulose present in grass to be digested completely.
(i) Name two waste products which are stored in old xylem in plants.
(ii) Name the process by which plants get rid of excess water. Name the pores through which this process takes place. (2015)
(i) Resin and gums are the two wastes which are stored in old xylem in plants.
- Transpiration is the process by which plants get rid of excess water.
- Stomatal pores are the pores through which transpiration takes place.
Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Write the first step from where such a type of reproduction begins. Draw first two stages of this reproduction. (2017 D)
The type of asexual reproduction in which two individuals are formed from a single parent and parental identity is lost is called Binary fission.
The first step of this reproduction is elongation of cells and its nucleus.
Draw in sequence (showing the four stages), the process of binary fission in Amoeba. (2017 OD)
Life Processes Class 10 Important Questions Short Answer Type II
(a) Explain with the help of diagram, how amoeba takes its nutrition.
(b) Assume that you are a veterinary surgeon and you had removed a good length of the small intestine of a bear that was suffering from an intestinal tumor. Now, would you suggest a plant based or a meat based diet for the bear after its recovery? Give reason for your answer.
(c) Do you think plant based food should be preferred over non-vegetarian food? (2012)
(a) Amoeba takes in the food particles with the help of its finger like projections called pseudopodia. Inside its cell a food vacuole is formed around the food particle. Inside the food vacuole, complex substances are broken down into simpler ones which are then diffused into the cell cytoplasm. The remaining undigested material is sent to the surface of the cell and thrown out. The process of nutrition in Amoeba is called Endocytosis.
(b) I would suggest a meat based diet for the bear after its recovery because meat based food can be digested easily in a smaller sized small intestine.
(c) We should encourage vegetarian food over non-vegetarian food.
Name three different glands associated with the digestive system in humans. Also name their secretions. (2012)
Three glands associated with the digestive system are as follows:
1. Salivary glands in the mouth produce saliva. Saliva contains an enzyme called salivary amylase which digests the starch present in food into sugar.
2. Liver is the largest gland which secretes bile and pours its secretion in the duodenum (part of the small intestine). Bile makes the acidic food coming from the stomach alkaline so that pancreatic enzymes can act on it. Bile salts also break the fats present in the food into small globules.
3. Pancreas is also a large gland which secretes pancreatic juice into the duodenum. Pancreatic juice contains
- pancreatic amylase which breaks down the starch.
- Trypsin digests the protein.
- lipase which breaks down the emulsified fats.
- Pancreatic juice acts on alkaline medium.
(a) What is translocation? Why is it essential for plants? (2013)
(b) Where are the substances translocated by the phloem delivered?
(a) The movement of food from leaves to other parts of the plant in phloem is called translocation. The translocation is necessary because every part of the plant needs food for obtaining energy, for building its parts and maintaining its life.
(b) The movement of food in phloem is transported upwards or downwards depending on the needs of the plant, for example, in spring, even the sugar stored in the root or stem tissue of a plant would be transported through phloem to the buds which need energy to grow.
(i) Which organ secretes a hormone when the blood sugar rises? Name a digestive enzyme released by this organ.
(ii) Why pancreas helps in digestion and also regulates blood sugar? (2013)
(i) Pancreas secretes insulin (hormone) when the blood sugar rises. Pancreas secretes pancreatic juice which contains ciigestive enzymes.
(ii) Pancreas secretes enzymes like pancreatic amylase which breaks down starch, trypsin which breaks down proteins and lipase breaks down emulsified fats.
Pancreas also secretes a hormone called insulin which controls the metabolism of sugar. Therefore it lowers the blood sugar level. So pancreas is both an exocrine and an endocrine gland.
Give reasons for the following:
(a) Arteries are thick walled.
(b) Blood goes only once through the heart in fishes.
(c) Plants have low energy needs. (2013)
(a) Arteries have thick walls because these vessels carry blood from the heart to all the parts of the body and blood emerges from the heart under high pressure.
(b) A fish has a two chambered heart and has gills to oxygenate blood. In a fish, the heart pumps deoxygenated blood to gills where oxygenation of blood takes place. The oxygenated blood from the gills is supplied to the body parts of the fish where oxygen is utilised and carbon dioxide enters into it, making it deoxygenated. This deoxygenated blood returns to the heart to be pumped into gills again. Thus blood passes through the heart of fish only once in one complete cycle.
(c) Plants are fixed at a place and do not show any locomotion. Plants are less active. Their cells do not need to be supplied with materials so quickly. Therefore plants have low energy needs and respire at a slow rate.
(a) With the help of a neat labelled diagram show how amoeba captures its food?
(b) What is the mode of nutrition in amoeba? (2013)
(b) Mode of nutrition in Amoeba is holozoic.
(a) What happens to the heart when muscles work harder?
(b) Which body system is directly affected when a person has heart disease?
(c) Which cells increase in number during infection? (2013)
(a) When muscles work harder, the heart beats faster because the muscles need more energy than the
normal requirement. The faster beating of heart pumps blood more rapidly to the muscles which supplies more oxygen to the muscle cells for rapid respiration to produce more energy.
(b) Human circulatory system is directly affected when a person has heart disease.
(c) White blood cells (WBCs) increase in number during infection.
The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air from nostrils to the lungs in human beings. (2014)
The animals which live in water (aquatic animals) use the oxygen dissolved in water to carry out respiration. Since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore, the rate of breathing in aquatic animals is much faster than in terrestrial animals. A faster rate of breathing provides more oxygen to aquatic animals.
Pathway of air in human beings:
Nostrils → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Lungs
(a) State the purpose of formation of urine. (2014)
(b) What will happen if there is no tubular reabsorption in the nephrons of kidney?
- Urea is produced as a waste by decomposition of unused proteins in the liver. Our body must get rid of these waste materials because their accumulation in the body is poisonous and harmful for us.
- Kidneys are the organs which remove the poisonous substance urea, other waste salts and excess water from the blood and excrete them in the form of a yellowish liquid called urine.
(b) During filtration, the substances like glucose, amino acids, salts, water and urea etc. present in the blood pass into Bowman’s capsule and then enter the tubule of nephron. When the filtrate containing useful substances as well as the waste substances passes through the tubule, the useful substances like glucose, amino acids, most salts and most water etc. are reabsorbed into blood through blood capillaries surrounding the tubule.
Only the waste substances like urea, some unwanted salts and excess water remain behind in the tubule. Therefore, reabsorption in the nephrons of kidneys is important.
Explain how water and minerals are transported in plants? (2014)
Most plants secure their water and minerals from their roots. Minerals travel dissolved in water. Water and minerals are transported through xylem cells from the soil to the leaves. The xylem cells of roots, stem and leaves are interconnected to form a conducting channel. The root cells take ions from the soil.
This creates a difference between the concentration of ions of roots and soil. Therefore, there is a steady movement of water into xylem. An osmotic pressure is formed and water and minerals are transported form one cell to the other due to osmosis. The continuous loss of water takes place due to transpiration.
Draw a neat diagram of excretory system of human beings and label on it:
Kidney, Urinary bladder, Ureter (2014)
Name any three glands associated with digestion in humans. Write the names of enzymes secreted by them. (2015)
|1. Salivary glands|
|3. Gastric glands|
Bile juice does not contain any enzyme but bile salts are important for digestion and absorption of fats. State reason. (2015)
Bile is a digestive juice secreted by the liver. Although it does not contain any digestive enzymes, it plays an important role in the digestion of fats.
Bile is alkaline and contains salts which help to emulsify or break the fats (or lipids) present in the food. Thus, bile performs two functions:
- Makes the acidic food coming from the stomach alkaline so that pancreatic enzymes can act on it.
- Bile salts break the fats present in the food into small globules making it easy for the enzymes to act and digest them.
(a) State reason for the following: (2015)
(i) Rings of cartilage are present in the trachea.
(ii) Plants look green in colour.
(b) Write other names of the following:
(i) Alveolar sac
(ii) Voice box
(a) (i) The air coming from the nostrils during breathing passes through the trachea. The trachea does
not collapse even when there is no air in it because it is supported by rings of soft cartilages.
(ii) Plants look green in colour because of the presence of a green pigment called chlorophyll in their chloroplasts.
(b) (i) Alveolar sac → Alveoli
(ii) Voice box → Larynx
Describe the structure and functioning of nephron. (2017 D)
Structure of nephron. Nephron is the basic filtration unit in the kidney. It consists of a tubule which is connected with a collecting duct at one end and a cup shaped structure at the other end, called Bowman’s capsule.
Every Bowman’s capsule contains a cluster of capillaries called glomerulus within the cup-shaped structure. The blood enters into glomerulus through afferent arteriole of renal artery and leaves it through efferent arteriole.
Basic functions of Nephrons:
- Filtration: Filtration of the blood takes place in Bowman’s capsule in the capillaries of the glomerulus. Then this filtrate passes into the tubular part of the nephron. The filtrate contains glucose, amino acids, urea and uric acid and a large amount of water.
- Reabsorption: The filtrate flows along the tubule and useful substances such as glucose, amino acids, salts and some water are re-absorbed into the blood by the capillaries surrounding the nephron tubule.
- Urine: The filtrate which remains after the re-absorption is called the urine, which is collected from nephron by the collecting duct to carry it to the urinary bladder and then to the urethra.
Explain the nutrition process in Amoeba. (2017 OD)
Amoeba takes in the food particles with the help of its finger like projections called pseudopodia. Inside its cell a food vacuole is formed around the food particle. Inside the food vacuole, complex substances are broken down into simpler ones which are then diffused into the cell cytoplasm. The remaining undigested material is sent to the surface of the cell and thrown out.
This process of nutrition in Amoeba is called Endocytosis.
Draw a labelled diagram of human heart. (2017 OD)
Life Processes Class 10 Important Questions Long Answer Type
Draw the diagram of sectional view of human heart and on it name and label the following parts:
(a) The chamber of the heart that pumps out deoxygenated blood.
(b) The blood vessel that carries away oxygenated blood from the heart.
(c) The blood vessel that receives deoxygenated blood from the lower part of our body. (2012)
(a) The chamber of the heart that pumps out deoxygenated blood – Right ventricle
(b) The blood vessel that carries away oxygenated blood from the heart – Aorta
(c) The blood vessel that receives deoxygenated blood from the lower part of our body – Inferior Vena Cava
(a) Draw a diagram of human alimentary canal and label the following parts:
(i) largest gland.
(ii) Gland that secretes digestive enzymes and hormone.
(iii) Part where HCl is produced.
(iv) Part where digested food is absorbed.
(b) What are villi? Explain their function in the digestive system. (2012)
(a) (i) Largest gland – Liver
(ii) Gland that secretes digestive enzymes and hormone – Pancreas
(iii) Part where HCl is produced – Stomach
(iv) Part where digested food is absorbed – Small intestine
(b) The small intestine is especially adapted for absorption of digested food. The inner surface of small intestine has millions of tiny, finger like projections called villi which provide the inner walls of small intestine a very large surface area. The large surface area helps in the rapid absorption of digested food. The villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body.
Draw the human respiratory system and label the following parts: (2013)
(a) Trachea (b) Alveoli (c) Respiratory bronchioles (d) Larynx
Describe in brief the role of lungs in the exchange of gases.
Human respiratory system:
Role of lungs:
1. When we breathe in air, the diaphragm contracts which results in the increase of chest cavity. Due to this expansion of chest cavity, the air pressure in the lungs decreases. Thus, air from outside rushes into the lungs through nostrils, trachea and bronchi. Thus sacs of lungs get filled with air when we breathe in. The exchange of gases between alveoli and blood takes place by the process of diffusion.
2. Now the air present in air sacs of the lungs is rich in CO2. When we breathe out air, the diaphragm relaxes which results in the decrease of chest cavity. This contraction pushes the air from the lungs into the trachea, nostrils and then out of the body into air. Breathing in of air is called inhalation and breathing out of air is called exhalation.
(a) Compare the length of small intestine in herbivore and carnivore animal. (2013)
(b) Mention any two structural modifications in small intestine which helps in absorption.
(a) The length of the small intestine differs in various animals depending on the type of food they eat. For example, cellulose is a carbohydrate food which is digested with difficulty. So, the herbivorous animals like cow which eat grass need a longer ‘small intestine’ to allow the cellulose present in grass to be digested completely. On the other hand, meat is a food which is easier to digest. So, the carnivorous animals like tigers which eat meat, have a shorter ‘small intestine’.
(b) The inner surface of small intestine has millions of tiny, finger-like projections called villi. The presence of villi gives the inner walls of the small intestine a very large surface area and the large surface area of small intestine helps in the rapid absorption of digested food.
(a) Explain how the separation of oxygenated and deoxygenated blood is useful in humans?
(b) Why is double circulation of blood necessary in humans? (2015)
(a) Humans have a four chambered heart which consists of two atria and two ventricles. In a four chambered heart, the left side and right side of the heart are completely separated to prevent the oxygenated blood from mixing with deoxygenated blood. Such a separation allows a highly efficient supply of oxygen to the body cells which is necessary for producing a lot of energy. This energy is useful for a warm blooded animal (like humans) which has high energy needs to maintain body temperature.
(b) All the animals having four chambered hearts have double circulation in which the blood passes through the heart ‘twice’ in one complete cycle of the body. This ensures the separation of oxygenated blood from deoxygenated blood.
Double circulation. The blood travels twice through the heart in one complete cycle of the body and is called double circulation. It involves two circulations:
1. Pulmonary circulation. The pathway of the blood from the heart to the lungs and back to the heart is called pulmonary circulation. It is a small circulation. Deoxygenated blood in the right ventricle flows into the vascular system of the lungs, becomes oxygenated and returns to the hearts left atrium through pulmonary veins.
2. Systemic circulation. The pathway of the blood from the heart to the rest of the body and back to the heart is called systemic circulation. It is a large circulation. Left ventricle sends the blood into the aorta. Aorta divides into arteries, arterioles and capillaries and supplies oxygenated blood to various parts of the body. From there the deoxygenated blood is collected by venules, which join to form veins and finally vena cava and pours blood back into the right atrium.
Describe double circulation in human beings. (2017 D)
(a) Why is it necessary?
(b) How are arteries different from veins?
(a) Double circulation of blood means, that the blood enters twice in the heart during its one circulation in other parts of the body. First time oxygenated blood from lungs enters the left atrium and second I time de-oxygenated blood enters the right atrium through two main vena cava. Double circulation of blood is necessary to separate the oxygenated blood from the de-oxygenated blood to provide more energy for efficient working of body organs.
- Arteries are thick walled.
- Arteries carry blooci from the heart to different organs of the body.
- Arteries do not have valves.
- Arteries are deeply placed.
- Veins are thin walled.
- Veins carry the blood from body organs to the heart.
- Veins have valves in them.
- Veins are superficially placed.
"How do we know what we claim to know?" is quite easily the most important question in science. In fact, the scientific method is designed precisely to answer that question.What is life processes Class 10 in simple words? ›
There are certain basic vital processes, which are essential for an organism to stay healthy and to maintain the proper functioning of the body's organ systems. They are necessary for survival. These basic essential activities performed by an organism are called life processes.What is respiration class 10 chapter 6? ›
Respiration: The process by which a living being utilises the food to get energy, is called respiration. Respiration is an oxidation reaction in which carbohydrate is oxidized to produce energy. Mitochondria is the site of respiration and the energy released is stored in the form of ATP (adenosine triphosphate).What are the 7 key life processes? ›
Life processes: These are the 7 processes all living things do - movement, reproduction, sensitivity, nutrition, excretion, respiration and growth.What are the main 5 life processes? ›
The basic processes of life include organization, metabolism, responsiveness, movements, and reproduction.What are 3 good scientific questions? ›
- What is the universe made of? Astronomers still cannot account for 95% of the universe. ...
- How did life begin? ...
- Are we alone in the universe? ...
- What makes us human? ...
- What is consciousness? ...
- Why do we dream? ...
- Why is there stuff? ...
- Are there other universes?
What happens to us after we die? How did so much life appear on our planet when others seem devoid of any species at all? Who, if anyone, pulls the strings of our universe? Is it some all-powerful god in control or are there physical and mathematical principles driving the engine of our existence?What is the importance of life processes Class 10? ›
∙ All these processes are important for the survival of the organism. Out of all of this, the most important is nutrition which helps the organism function and reproduction which maintains the number of organisms. Was this answer helpful?How many topics are there in life processes Class 10? ›
There are six life processes that all living organisms perform. They are movement, respiration, growth, reproduction, excretion and nutrition.
Life processes are the series of actions, such as movement, respiration, sensitivity, growth, reproduction, excretion and nutrition that are essential for a living being to sustain.What is the topic of respiration? ›
Respiration is the process of gas exchange between the air and an organism's cells. Three types of respiration include internal, external, and cellular respiration. External respiration is the breathing process. It involves inhalation and exhalation of gases.What is the difference between breathing and respiration? ›
Breathing is a mechanical process where the air volume changes in the chest cavity. On the other hand, respiration is a biochemical process where oxygen is introduced into the bloodstream and carbon dioxide is expelled from the body.What is the answer of respiration? ›
The transfer of oxygen from the outside environment to cells within tissues, as well as the removal of carbon dioxide in the opposite way, is referred to as respiration. It is a biological reaction that takes place within the cells of living organisms.What is the definition of life? ›
Life is defined as any system capable of performing functions such as eating, metabolizing, excreting, breathing, moving, growing, reproducing, and responding to external stimuli.What is respiration class 10 science? ›
“Respiration is defined as a metabolic process wherein, the living cells of an organism obtains energy (in the form of ATP) by taking in oxygen and liberating carbon dioxide from the oxidation of complex organic substances.”What are the 5 types of life? ›
Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.What are 10 living things? ›
- Human beings.
These basic processes are known as the life processes and include nutrition, metabolism, transportation, respiration, excretion and reproduction.What are basic science questions? ›
- Why is the sky blue? ...
- How much does the earth weigh? ...
- How far away is the sun? ...
- What is a black hole? ...
- How do airplanes fly? ...
- How do flies walk on the ceiling? ...
- How are rainbows made? ...
- Are sharks mammals?
Moral judgments, aesthetic judgments, decisions about applications of science, and conclusions about the supernatural are outside the realm of science.What are the top 10 questions science can t answer? ›
- Space. What came before the big bang? ...
- Physics. How does a bicycle stay upright? ...
- Space. Is the universe infinite or just very big? ...
- Physics. How long does a proton live? ...
- Physics. Why is ice slippery? ...
- Physics. What is glass? ...
- Physics. Can we get energy from nothing? ...
One of the great frustrations of science is that most scientific questions cannot be answered completely. There are certain questions that may not be scientific at a given time, but they may become so in the future.What is an example of a question that science can answer? ›
The questions that are testable can be answered through science by experiments, observations, or surveys. For instance, whether a river can move a huge rock is a matter of science because the answer is testable.What are the 4 types of questions that science can not answer? ›
- What is the nature of dark matter? ...
- What is the nature of dark energy? ...
- What happened before the Big Bang? ...
- Are we alone in the Universe? ...
- The puzzle of the human brain and consciousness.
- Are gender traits completely a result of societal expectations?
- Are there any parts of the human body that get oxygen directly from the air and not from the blood?
- Are there nuclear reactions going on in our bodies?
- Can humans ever directly see a photon?
- Can I turn my cat into a diamond?
- 1 Do some example problems.
- 2 Go through some flashcards.
- 3 Make a concept map from memory.
- 4 Try explaining the material in simple terms.
- 5 Remember concepts with mnemonic devices.
- 6 Take practice quizzes.
- 7 Rewrite your notes in your own words.
- 8 Read and summarize textbook chapters.
Photosynthesis is the process by which green plants produce carbohydrates using carbon dioxide, and water in the presence of sunlight. This process can be termed as the most important life process in the ecosystem as it enables the conversion of light energy of the sun to chemical energy in the form of carbohydrates.What is photosynthesis class 10? ›
Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.What is the difference between nutrition and respiration? ›
i) Nutrition :– is the process of taking food by an organism and its utilization by the body for life processes. ii) Respiration :– is the process by which food is burnt in the cells of the body with the help of oxygen to release energy.
Reproduction is not regarded as a life process because it is not required to sustain life. Although reproduction is required to maintain an organism's lineage, an individual organism can live even without reproduction. Reproduction is a feature or characteristic shared by all living organisms.What is excretion class 10? ›
Excretion is a biological process that separates and removes wastes and non-useful products from the body.What is study of life process called? ›
Thus, the answer is option (B) Physiology.What is called nutrition? ›
Nutrition is about eating a healthy and balanced diet. Food and drink provide the energy and nutrients you need to be healthy. Understanding these nutrition terms may make it easier for you to make better food choices.What are the 4 types of respiration? ›
- Pulmonary Ventilation. moving air into and out of the lungs. ...
- External Respiration.
- Transport. transport of oxygen and carbon dioxide between the lungs and tissues.
- Internal Respiration. diffusion of gases between the blood of the systemic capillaries and cells.
- Aerobic Respiration — Takes place in the presence of oxygen.
- Anaerobic Respiration –Takes place in the absence of oxygen.
Diaphragmatic breathing requires contraction of the diaphragm and is also called deep breathing. Costal breathing requires contraction of the intercostal muscles and is also called shallow breathing.Why is breathing called respiration? ›
Breathing is a process through which air containing oxygen and carbon dioxide is taken into the body. The oxygen is then taken into the blood from the lungs and is transported to all the cells. Cells use this oxygen to obtain energy from the nutrients in the food we eat. This process is called respiration.Is breathing equal to respiration? ›
Breathing and respiration are two completely different but interrelated body processes that assist body organs to function properly. Breathing is the physical process of exchanging gases whilst respiration is a chemical process that takes place at a cellular level and produces energy.What is difference between photosynthesis and respiration? ›
|1. Photosynthesis is an anabolic process where a new molecule (glucose) is produced.||1. Respiration is a catabolic process in which the molecule (glucose) is broken down.|
This of 2 types : When respiration takes place in the presence of oxygen it is called aerobic respiration.What does 4 the word respiration mean? ›
respiration. noun. res·pi·ra·tion ˌres-pə-ˈrā-shən. : the movement of respiratory gases (as oxygen and carbon dioxide) into and out of the lungs. : a single complete act of breathing.Is o2 a respiration? ›
Oxygen is a critical component of Aerobic respiration in many animals.Which of the following is the most important life process? ›
Respiration is an important process, by the intake of oxygen and release of carbon dioxide that is required to produce energy in the cells of all organisms.Which life processes are not important? ›
Reproduction, unlike other life processes, is not essential to maintain the life of an individual organism.What is the most important life sustaining process? ›
Photosynthesis is the process by which green plants produce carbohydrates using carbon dioxide, and water in the presence of sunlight. This process can be termed as the most important life process in the ecosystem as it enables the conversion of light energy of the sun to chemical energy in the form of carbohydrates.What is the most important process in the world? ›
Photosynthesis is the single most important process on earth, for without it neither plants nor animals (including humans) could survive.What are the major elements of life which is the most important? ›
Scientists believe that about 25 of the known elements are essential to life. Just four of these – carbon (C), oxygen (O), hydrogen (H) and nitrogen (N) – make up about 96% of the human body.Which is the most important chemical of life? ›
1: The Chemical Basis of Life. Carbon is the most important element to living things because it can form many different kinds of bonds and form essential compounds.What are the important definitions of life process? ›
Life processes are the series of actions, such as movement, respiration, sensitivity, growth, reproduction, excretion and nutrition that are essential for a living being to sustain.
Animal performs respiration through gills, lungs, skin, and other respiratory organs. The food is stored in the form of starch. The food is stored in the form of glucose. A plant has a cell wall, chloroplast, plasmodesmata, plastids, and different organelles.What is the difference between respiration and excretion? ›
Excretion is the process of removing waste products from the body, while respiration is the process to remove energy from food. Respiration and excretion are also processes that plants go through.Why is reproduction not a life process class 10? ›
Reproduction is not regarded as a life process because it is not required to sustain life. Although reproduction is required to maintain an organism's lineage, an individual organism can live even without reproduction. Reproduction is a feature or characteristic shared by all living organisms.Why is photosynthesis so important? ›
They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel. These primary producers form the base of an ecosystem and fuel the next trophic levels. Without this process, life on Earth as we know it would not be possible.Why is water important for life? ›
Liquid water is an essential requirement for life on Earth because it functions as a solvent. It is capable of dissolving substances and enabling key chemical reactions in animal, plant and microbial cells. Its chemical and physical properties allow it to dissolve more substances than most other liquids.Why is respiration important? ›
Humans get the oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells the ability to break down food in order to get the energy we need to survive. Although other animals may use different organs to breathe with, they all get oxygen into their bodies through respiration.What is more important photosynthesis or respiration? ›
Nevertheless, PHOTOSYNTHESIS is still the most important biological process on earth! Without photosynthesis, virtually all plants and animals would become extinct. Process of making energy of food available in the cell…What if photosynthesis stopped? ›
If photosynthesis ceased, there would soon be little food or other organic matter on Earth, most organisms would disappear, and Earth's atmosphere would eventually become nearly devoid of gaseous oxygen.What is needed for photosynthesis? ›
To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots.