Life Processes

CBSE Class 10 Science · every board question from this chapter, 2022–2026

• Which structure in a leaf is mainly responsible for gaseous exchange?2026
• Pravin was given a list of characteristics associated with the process of anaerobic respiration in humans, in the table given…2026
• Identify the part that controls the closing and opening of the stomatal pore in leaves of plants. Select the correct option.2026
• Observe the given figure and select the statement that correctly states how these fungi obtain nutrition.2026
• Observe the figure given below and identify the incorrect step for the activity set-up:2026
• If the stomatal pore is open, it indicates which situation from the following?2026
• The carbohydrates, which are not used immediately in plants, are stored in the form of 'a', which serves as an internal energy…2026
• Select the option that represents the correct balanced equation for the process of photosynthesis:2026
• Pancreas secretes pancreatic juice which contain certain enzyme that helps in digestion of food. Choose the correct option from…2026
• The following events occur during the process of photosynthesis. Choose the option that indicates the correct events. (i)…2026
• Following are the statements about the different parts of the brain. Select the correct statements. (i) The thinking part of the…2026
• Study the given diagram of the heart, with blood vessels marked '1' and '2'. From the following statements, establish the…2026
• In plants, the role of cytokinin is to/in:2026
• The reasons for excessive generation of wastes are: (i) Use and throw policy. (ii) Increased availability of packaged food. (iii)…2026
• In human beings the oxygen rich blood is pumped out to the body by:2026
• Opening of stomata is regulated by:2026
• Plants use variety of techniques to get rid of their waste materials. Some are mentioned below. Identify the incorrect one:2026
• Assertion: Arteries have valves as they have to withstand high pressure. Reason (R): Arteries are vessels which carry blood away…2026
• Assertion: Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory pigments. Reason…2026
• Assertion: The basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood capillaries.…2026
• Assertion: In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R): Haemoglobin has a very…2026
• Give a diagrammatic representation of nutrition in Amoeba.2026
• What is the function of diaphragm in human respiratory system? Where is it present in human body?2026
• Why is bile juice considered to be very important for digestion, even though it doesn't contain any digestive enzymes? Name some…2026
• "Transpiration in plants is a necessary evil." Comment on the statement giving two reasons.2026
• What kind of respiration provides more energy and why?2026
• The leaves of a plant first prepares food 'P' by photo-synthesis. Food 'P' is then converted to food 'Q', which is stored in the…2026
• Why the lungs always contain a residual volume of air?2026
• State two differences between the act of chewing food and salivation on sight of food. OR State two differences between…2026
• Varun is diabetic. His latest ultrasound reports showed a blockage in his pancreatic duct. How will this affect the dual…2026
• Separation of right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing. Various…2026
• Observe the following diagrams: Case P Case Q Case R What change will be observed in Cases 'P', 'Q' and 'R'? Give reasons. In…2026
• In xylem tissue, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of…2026
• Draw a neat diagram of the human respiratory system and label its lungs, trachea, bronchi and alveoli. State the roles of the…2026
• Complete the pathways given below, showing the breakdown of glucose. Identify 'A', 'B', 'C', 'D', 'E' and 'F'.2026
• Give differences between the following: Nephron and neuron Sensory nerve and motor nerve Consumers and decomposers2026
• Give reasons for the following: Plants do not have an excretory system so how they excrete their wastes? Why do mammals and birds…2026
• Give reasons for the following: 3 × 1=3 Herbivores have a longer small intestine. Inner lining of small intestine has numerous…2026
• Kidneys help to regulate the volume of fluid and various metabolites waste products in the body. Normally, kidney filter about…2026
• The pH of the gastric juices released during digestion is:2026
• Give reasons: 3 × 1=3 (i) Potato chips manufacturers fill the packet of chips with nitrogen gas. (ii) Respiration is an…2026
• The essential element taken up from the soil by the plants to synthesize proteins is:2025
• Select TRUE statements about lymph from the following: A. Lymph vessels carry lymph through the body and finally open into larger…2025
• The essential element used in the synthesis of proteins is:2025
• Select the correct option from the following statements about the functioning of the human heart.2025
• The opening and closing of stomata is regulated by:2025
• One-cell thick blood vessels are known as:2025
• Secretion of less saliva in mouth will effect the conversion of:2025
• Listed below are the steps of nutrition in Amoeba. Select the correct sequence of these steps: (i) Diffusion of simple nutrients…2025
• Parasitic mode of nutrition is observed in:2025
• Temporary finger-like extensions on the cell surface to take in food is formed in:2025
• The gastric glands present in the wall of the stomach release:2025
• Which one of the following is not an excretory product in plants?2025
• The basic filtration unit of the excretory system in human beings is:2025
• In human alimentary canal, the digestive juice secreted by the gastric glands are2025
• In aerobic respiration, the steps are: breakdown of glucose to pyruvate and its further conversion to carbon dioxide. Both…2025
• The breakdown of glucose has taken the following pathway: Glucose →(a) Pyruvate + Energy →(b) Lactic acid + Energy The sites 'a'…2025
• The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem…2025
• Assertion: In large animals, oxygen can reach different parts of the animal's body easily. Reason (R): Respiratory pigments take…2025
• Assertion: Xylem tissue moves water and minerals obtained from the soil by the roots. Reason (R): Xylem tissue is found only in…2025
• Assertion (A): Animals will not get energy if they eat (consume) coal as food. Reason (R): Specific enzymes are needed for the…2025
• Assertion: All organisms can make organic compounds like sugar and starch from inorganic substances using radiant energy of the…2025
• State the main function of veins in human circulatory system. Why do they not need thick walls?2025
• Name the tissues which form the vascular bundle. State their function in plants.2025
• How is lymph formed? State its important function. OR Identify 'X' in the figure of human nephron shown below. What role does it…2025
• Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel? Name the component of blood which…2025
• "In human alimentary canal the small intestine is designed to absorb the digested food." Justify this statement.2025
• "Plants use a variety of techniques to get rid of waste material." Justify this statement giving any four ways.2025
• State the main function of arteries. Why do they have thick and elastic walls?2025
• Write the percentage of the energy of sunlight captured by green plants, to convert it into food energy. Explain the fate of this…2025
• Explain why respiration is considered as an exothermic reaction. Give the chemical equation for this reaction.2025
• Name the blood vessel that brings (i) oxygenated blood (ii) deoxygenated blood, to the human heart. Also name that chamber of the…2025
• The digestion of food in human alimentary canal is a complex process. State the enzyme/salt present in the following and mention…2025
• Write the name and one function of respiratory pigment found in human beings. Why do lungs always contain a residual volume of…2025
• What is the first step of cellular respiration? In which part of the cell does it occur? Write the equation for the process of…2025
• Why is blood circulation in vertebrates known as "double circulation"? Trace its path in the form of a flow chart.2025
• On the basis of the characteristics of the processes given in the brackets in each case, differentiate between the following:…2025
• Enlist any two nitrogenous waste products removed from the blood of human kidney. Name the capillary cluster formed by the branch…2025
• List three raw materials required by terrestrial plants for photosynthesis. Explain how nature provides these raw material to the…2025
• Give reasons for the following: Rate of breathing in aquatic animals is much faster than terrestrial organisms. Rings of…2025
• (i) "The length of the small intestine in various animals depends on the food they eat." Justify the statement. (ii) Discuss the…2025
• The maintenance functions of all living organisms must go on even when they are not doing anything particular. Even when we are…2025
• The acid produced in our stomach during digestion and the base used to neutralise the excess acid during indigestion respectively…2024
• The process in which transport of soluble products of photosynthesis takes place in plants is known as:2024
• In human beings, when the process of digestion is completed, the (i) proteins, (ii) carbohydrates, and (iii) fats are…2024
• Which of the following statement(s) is (are) true about human heart? Right atrium receives oxygenated blood from lungs through…2024
• In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be:2024
• Which one of the following statements is TRUE for Hydra, Amoeba and Spirogyra?2024
• Which of the following statement (s) is (are) true about human heart? Right atrium receives oxygenated blood from lungs through…2024
• A stomata closes when: (i) it needs carbon dioxide for photosynthesis. (ii) it does not need carbon dioxide for photosynthesis.…2024
• A stomata closes when: (i) it needs carbon dioxide for photosynthesis. (ii) it does not need carbon dioxide for photosynthesis.…2024
• Assertion: Most of the plants close their stomata at night. Reason (R): Closing of stomata helps to conserve water as large…2024
• Assertion: In the human heart ventricles have thicker muscular walls than atria. Reason (R): Ventricles have to pump the blood…2024
• Assertion: The rate of breathing in aquatic organisms is much faster than in terrestrial organisms. Reason (R): The amount of…2024
• State one role of each of the following in human digestive system: (i) Hydrochloric acid (ii) Villi (iii) Anal Sphincter (iv)…2024
• Photosynthesis takes place in the leaves and the food prepared by it reaches other parts of the plants. Name the process involved…2024
• Name the blood vessel which brings blood to the kidneys. Why is nephron called a basic filtration unit of kidney? Write the role…2024
• (i) Give reason why herbivorous animals have longer, small intestine than carnivorous animals? (ii) Although 'Pepsin' and…2024
• Two test tubes A and B are taken, each containing one mL of starch solution. Add 1 mL of saliva to test tube 'A' only and leave…2024
• We need to water the soil in plants on a regular basis. But it ultimately reaches the leaves of the plant. Explain how this takes…2024
• Sometimes while running, the athletes suffer from muscle cramps. Why? How is the respiration in this case different from aerobic…2024
• Mention the pathway of urine in our body starting from the organ of its formation to its excretion. What will happen if the…2024
• Give reasons for the following: (i) Alveoli in lungs are richly supplied with blood capillaries. (ii) Respiratory pigment in the…2024
• (i) Why is respiratory pigment needed in multicellular organisms with large body size? (ii) Give reasons for the following: Rings…2024
• Give reasons for the following: (i) Alveoli in lungs are richly supplied with blood capillaries. (ii) Respiratory pigment in the…2024
• In the context of the statement "chlorophyll is necessary for photosynthesis" answer the following questions: (i) What are…2024
• Give reasons for the following: (i) Alveoli in lungs are richly supplied with blood capillaries. (ii) Respiratory pigment in the…2024
• Write the main difference between aerobic and anaerobic respiration. State the pathway which is common for both. Write the…2024
• (i) Which organisms have a three-chambered heart? Why do they have three-chambered hearts? (ii) List two functions of lymph.2024
• Design an experiment to demonstrate that carbon dioxide is essential for photosynthesis. Write the observation and conclusion of…2024
• Design an experiment to demonstrate that carbon dioxide is essential for photosynthesis. Write the observation and conclusion of…2024
• Human digestive system is a tube running from mouth to anus. Its main function is to breakdown complex molecules present in the…2024
• Kidneys are vital organs for survival. Several factors like infections, injury or restricted blood flow to kidneys reduce the…2024
• Which of the following is an example of endothermic process?2023
• In the given diagram of a closed stomata: (1), (2), (3) and (4) respectively are2023
• Given below are two columns, Column I shows enzymes secreted by the glands in the alimentary canal of human beings and Column II…2023
• Select endothermic reaction from the following:2023
• The process in which loss of water in the form of vapours from the aerial parts of plants takes place is X, which helps in Y.…2023
• Sphincter muscles are present at the exit of:2023
• Observe the following diagram and identify the process and its significance from the following options:2023
• An organism which breaks down the food material outside the body and then absorbs it is2023
• In the following diagram, identify the cells through which massive amounts of gaseous exchange takes place for photosynthesis:2023
• As compared to terrestrial organisms, the rate of breathing in aquatic organisms is:2023
• Consider the following statements about small intestine and select the one which is NOT correct:2023
• Water in the root enters due to:2023
• Opening and closing of stomata is due to:2023
• One of the events that does not occur during photosynthesis is:2023
• In plants the role of cytokinin is:2023
• Assertion: The anaerobic respiration which takes place in yeast, has one of the end products as an acid. Reason (R): During…2023
• Assertion: Blood clotting prevents excessive loss of blood. Reason (R): Blood clotting is due to blood plasma and white blood…2023
• Assertion: The walls of atria are thicker than those of the ventricles. Reason (R): Ventricles have to pump blood into various…2023
• Assertion: Amoeba takes in food using finger like extensions of the cell surface. Reason (R): In all unicellular organisms, the…2023
• Assertion: The inner walls of the small intestine have finger like projections called villi which are rich in blood. Reason (R):…2023
• Assertion: Left atrium receives oxygenated blood from pulmonary vein. Reason (R): Right atrium transfers deoxygenated blood to…2023
• Why is it important to prevent oxygenated and deoxygenated blood from mixing in birds and mammals? Which animals can tolerate…2023
• What will happen if: Xylem tissue in a plant is removed? We are injured and start bleeding?2023
• State the role of the following in the process of digestion: Bile juice and bile salts Pancreatic enzymes2023
• Give the name of the enzyme present in the fluid in our mouth cavity. State the gland which produces it. What would happen to the…2023
• Write one specific function each of the following organs in relation with excretion in human beings: (i) Renal Artery (ii)…2023
• What will happen if: Xylem tissue in a plant is removed? We are injured and start bleeding?2023
• Name the type of blood (oxygenated / deoxygenated) transported by each of the following mentioning the path (i.e. from one organ…2023
• Why is it important to prevent oxygenated and deoxygenated blood from mixing in birds and mammals? Which animals can tolerate…2023
• List the events in proper sequence that take place during the process of photosynthesis. OR Explain in brief two ways by which…2023
• In the process of digestion of food in human beings, two protein-digesting enzymes are secreted. Name the enzymes along with the…2023
• Write one important function each of the following in the human respiratory system: Rings of Cartilage Alveoli Haemoglobin Lining…2023
• Name the part of the human excretory system where nephrons are found. Write the structure and function of nephrons.2023
• Give two reasons, why bile juice is considered to be an important secretion of liver in the process of digestion?2023
• Explain the process of transport of oxygenated and deoxygenated blood in a human body.2023
• Suggest one remedial measure each to counteract the change in pH in human beings in following cases: (i) Production of too much…2023
• (i) State the role of ATP in cellular respiration. (ii) What ensures sufficient exchange of gases in plants? (iii) State the…2023
• With the help of an activity, explain the action of saliva on the food we eat. Why is bile juice important in the process of…2023
• (i) How does Paramecium obtain its food? (ii) List the role of each of the following in our digestive system: Hydrochloric acid…2023
• (i) What is meant by excretion? (ii) Name the organ that connects the kidneys with the urinary bladder. State its function. (iii)…2023
• (i) What is the first step in the breakdown of glucose during aerobic and anaerobic respiration? Where does it take place? (ii)…2023
• (i) How does Paramecium obtain its food? (ii) List the role of each of the following in our digestive system: Hydrochloric acid…2023
• Differentiate between binary fission in Amoeba and binary fission in Leishmania. How does reproduction take place in malarial…2022

Answers come from CBSE’s own marking schemes. How we source them.