LIFE PROCESSES – 2020 Important Questions


Q1. Why is energy is required by an organism even during sleep.

Q2. Give an example of an organism which derives nutrition from plants or animals without killing them. What are these organisms called?

Q3. In an experiment, saliva is added to the test tube containing pieces of bread (powdered). What will you observe?

Q4. What are the end products obtained on digestion of carbohydrates and proteins?

Q5. Name the cell organelle in which breakdown of pyruvate to give CO2, water and energy takes place.               

Q6.  It is seen that during aerobic respiration more energy is released as compared to the anaerobic respiration. Why?

Q7. During breathing cycle, what is the advantage of residual volume of air in lungs?

Q8. Why carbon dioxide is mostly transported in dissolved form?       

Q9. Why the walls of ventricles are thicker than the walls of atria?

Q10. What will happen if platelets are absent in the blood?

Q11.  Leakage of blood from vessels reduces the efficiency of pumping system. How is the leakage prevented?              

Q12. Why is right kidney placed slightly lower in position as compared to the left kidney?

Q13. Which substance is selectively reabsorbed by the tubular part of nephron?

Q14.  Out of about   170L of fluid filtered by the kidneys every day. How much is excreted in urine?

Q15. Name the substance which is present at a higher concentration in renal artery than in renal vein.

Q16. Why is urine yellow in colour?

Q17. Kidneys help in the process of osmoregulation? Explain.                    

Q18. Name two excretory products in plants other than oxygen and carbon dioxide.

Q19. Name a common nutrient that is absorbed in the small intestine and reabsorbed by the kidney tubules.

Q20. Where does digestion of fat takes place in our body?

Q21. What is the role of acid in our stomach?

Q22. Name the respiratory pigment in human beings. Where is this pigment found?  

Q23. Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

Q24.Name the process of loss of water in the form of vapour from the aerial parts of the plants.

Q25. How is the amount of urine produced regulated?

Q26. How would the digestion of food be affected if the bile duct is completely blocked?

Q27. Name the structure marked as ‘X’ in the given figure and also mention the functions of this structure.


Q28.  Which raw material is responsible for the release of O2 in photosynthesis?

Q29.   What is mainly digested by stomach of man?

Q30.  What is common between respiration and transpiration process in plants?

Q31.  What will happen if a human being starts taking air with mouth instead of nose?

Q32.  What stops blood from flowing backwards through the heart?

Q33. When the right atrium contracts, blood flows from it to which part of the heart?       

Q34.What is the systolic and diastolic pressure of a normal man?

Q35.   Name the excretory organs in unicellular organisms.

Q36.   What are the major constituents of urine?

Q37.  State the process by which chemical from blood enter the dialysing fluid?

Q38.   Name the substance which is present in the blood, but not in the urine of a healthy person?

Q39. What is the main function of kidneys in humans?

Q40. Fishes die when taken out of water. Why?

Q41. Why does a piece of bread start tasting sweeter after it is chewed for sometime?

Q42. How is urine produced?

Q43.  What will happen if the liver of a person gets damaged?

Q44.  Compare between the process of respiration in plants during night and day time.

Q45.       Enumerate the difference between translocation and transpiration.

Q46.   Tabulate two differences between renal artery and renal vein.   

Directions (0.  Nos.47-51) In the following questions,  a statement of Assertion is followed by a statement of Reason. Mark the correct choice as

(a) If both Assertion and Reason are true, and Reason is the correct explanation of Assertion

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

(c) If Assertion is true, but Reason is false

(d) If Reason is true, but Assertion is false

(e) If both Assertion and Reason are false

Q47. Assertion: Lungs always contain a residual volume of air.

            Reason: It is so to ensure enough time for the release of CO2 and for the absorption of O2 .

Q48. Assertion: In a healthy adult, the initial filtrate in the kidneys is about 180 L daily, but the actual volume excreted is only a litre a day.

            Reason: Most of the filtrate is lost from the body in the form of sweat.

Q49. Assertion: Respiration is opposite of Photosynthesis

            Reason: In Photosynthesis food is made from energy and in Respiration food is converted to energy.

Q50. Assertion: The four chambered heart does not mix oxygenated and deoxygenated blood.

            Reason: Four chambered heart is found in mammals with advanced body functions.

Q51. Assertion: Translocation of food occurs in Plants.

            Reason: Xylem tissue is responsible for Translocation.

Q52.  Select the incorrect pair.

(a) Respiration- – Oxidation of food to obtain energy

(b) Nutrition – Obtaining and utilising nutrients

(c) Transportation- Response to stimuli

(d) Excretion – Removed of waste by-products

Q53.  Which one of the following juices secreted in the human body does not contain any enzyme?

(a) Salivary juice

(b) Bile juice

(c) Gastric juice  

(d) Pancreatic juice

Q54.  Rings of cartilage present in the throat ensure that

(a) the air passage collapses

(b) the air passage does not collapse

(c) the air is filtered entering the nostrils

(d) None of the above

Q55. The function of the lymph fluid is to

(a) drains excess fluid from extracellular space back into the blood

(b) carries digested and absorbed fat from intestine

(c) circulates around the body and help in clotting of blood

(d) Both (a) and (b)


Q1. What are the adaptations of leaf for photosynthesis?

Q2.  State the function of the following in the alimentary canal

(i)   Liver (ii)   Gall bladder             (iii) Villi

Q3. (i) A product is formed in the cytoplasm of our muscles due to breakdown of glucose when there is a lack of oxygen. Name the product and also mention the effect of build-up of this product.

         (ii) Differentiate between fermentation in yeast and aerobic respiration on the basis of end products formed.

Q4. What is the logic behind the heavy breathing as we climb up a mountain?

Q5.  What is the role of respiratory pigment in respiration? Give one example.

Q6. State reason for the following:

               (i) Arteries have thick and elastic walls

               (ii) Arteries form capillaries

Q7. Describe translocation?  How does translocation take places in plants?         

Q8. Major amount of water is selectively reabsorbed by the tubular part of nephron. Write the factors on which the amount of water reabsorbed depends?          

Q9.         (i)  Write the important functions of the structural and functional unit of kidney.

                 (ii)   Write any  one  function  of  an  artificial kidney:             

Q10. State the necessary conditions for autotrophic nutrition and name the by-product. Mention the source of this by-product.

Q11. Enumerate three events which occur during the process of photosynthesis.

Q12. Sweet tooth may lead to tooth decay. Explain why? What is the role of toothpaste in preventing cavities?

Q13. Name three different glands associated with the digestive system in humans. Also, name their secretions.

Q14. List the role of each of the following in our digestive system:

(i) Muscles of Stomach wall

(ii) Hydrochloric acid

(iii) Mucus.

Q15. A variegated leaf with green and yellow patches is used for an experiment to prove that chlorophyll is required for photosynthesis.   Before the experiment, the green portions (A), and the pale-yellow portions (B), are observed. What will be the colour of ‘A: just before and after the starch test? Also write the equation of photosynthesis and mark, as well as validate from which molecule the by-product is obtained.

Q16. Define breathing. Explain the mechanism of breathing in human beings.

Q17. List three characteristics of lungs which make it an efficient respiratory surface.

Q18. Define transpiration. State its two functions.

Q19. (a) How does the transport of materials in xylem and phloem occurs?

           (b) What is translocation?

Q20. (a) What is lymph?

            (b) How is composition of lymph different from blood plasma?

            (c) List two functions of lymphatic system.

Q21. (i) Why do ventricles have thicker, muscular walls than atria?

            (ii) What are peristaltic movements?

           (iii) ‘Stomata remain closed in desert plants during day time.’ How do they do photosynthesis?

Q22. Give reasons for: –

(i) Oxygenated and deoxygenated bloods are separate in the heart of mammals.

(ii) Ventricles are thick-walled.

(iii) Herbivores have longer small intestine as compared to carnivores.

Q23. Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their functioning and structure.

Q24. How do leaves of plants aid in excretion?

Q25. (a) Why does the transport of food in plants require living tissues and energy?

            (b) Name the components of food that are transported by the living tissues.

Q26.  Given below is a diagram showing a section of the human heart.

(a) Identify the parts labelled as X, Y and Z in the above figure.

(b) Among the following given blood vessels, identify those

          (i) which carry oxygenated blood.

         (ii) which carry deoxygenated blood.

‘Pulmonary artery, Pulmonary vein, Aorta, Vena cava.’

Q27. Our body produces various waste products through different processes. List the waste products with the organs involved in their removal.

Q28. (a) The diagram given below shows parts of the human respiratory system. Identify and name the parts labelled as A-B in the figure.

        (b) Explain the working of lungs as organs of excretion.

Q29.  Which feature(s) help the plants to make food by the process of photosynthesis?

Q30.  ‘Aerobic respiration produces more ATP than anaerobic respiration’. Justify this statement.

Q31.    Write the pathway of oxygen travelling from atmosphere into the human body.

Q32.  ‘Diffusion pressure cannot deliver oxygen all over the body in bigger animals’.  Comment on this statement.

Q33.   Blood does not clot in the blood vessels. Give reason.

Q34.   How is double circulation different from single circulation?

Q35.   Explain, how the circulatory system carries waste products from liver to the kidneys?                    

Q36.  Explain the process by which plants get rid of their excretory products?


Q1. What are the many different ways in which glucose is oxidised to provide energy in various organisms?             

Q2. Describe the breathing process in human beings. 

Q3.   (i) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label following parts on it.

Lung to capillaries, pulmonary artery to lungs, aorta to body, pulmonary veins from lungs.

        (ii)  What is the advantage of having separate channels of heart for oxygenated and deoxygenated blood in mammals and birds?           

Q4.  What according to you is the advantage of having a four- chambered heart?

Q5.         (i)  Draw   the structure of a nephron and label the following parts on it.

(a) Renal artery  

(b) Bowman’s capsule

(c) Glomerulus   

(d) Collecting duct

               (ii)  Name four substances in the initial filtrate which are selectively reabsorbed as the filtrate floor along the tubule.

Q6. Waste products of plants are useful for human beings. Is it true? Explain.

Q7. (a) State the form in which the following are stored:

(i)   Unused carbohydrates in plants

(ii)  The energy derived from food in humans.

       (b) Describe the process of nutrition in Amoeba with the help of diagram.

       (c) How does Paramecium obtain its food?

Q8. (i) Name the process and explain the type of nutrition found in green plants. List the raw materials required for this process. Give chemical equation for the mentioned process.

        (ii) Write three events that occur during this process.

Q9. (a) Write the reaction that occurs when glucose breaks down anaerobically in yeast.

         (b) Write the mechanism by which fishes’ breath in water.

         (c) Name the balloon likes structures present in lungs. List its two functions.

         (d) Name the respiratory pigment and write its role in human beings.

Q10. (a) Draw diagram of cross-section of the human heart and label the following parts:

(i)   Right ventricle

(ii)   Aorta

(iii)  Left atrium

(iv)  Pulmonary arteries.

          (b) Give reasons for the following:

(i) The muscular walls of ventricles are thicker than the walls of atria.

(ii) Arteries have thick elastic walls.

Q11. (a) Mention any two components of blood.

            (b) Trace the movement of oxygenated blood in the body.

           (c) Write the function of valves present in between atria and ventricles.

           (d) Write the structural difference between the composition of artery and veins.

Q12. (a) Draw a diagram of human excretory system and label the following parts on it:

(i) Right Renal Artery       

(ii) Vena cava.

(iii) Urinary bladder  

(iv) Left kidney

           (b) List two vital functions of the kidney.   

Q13. (a) Define excretion.

            (b) Name the basic filtration unit present in the kidney.

            (c) Draw excretory system in human being and label the following organs of excretory system which perform following functions:

(i) form urine

(ii) is a long tube which collects urine from kidney.

(iii) store urine until it is passed out.

 Q14. (a) Draw a diagram of human excretory system and label the following:

(i)  part in which urine is produced

(ii)  part which stores the urine

(iii) part which connects (i) and (ii)

(iv) part from which urine is passed out.

           (b) Name the factors on which the amount of water reabsorbed along the tubular part of nephron depend on?

Q15. (a) In which form are oxygen and CO2 transported in the blood?

            (b) What happens to the muscles of the diaphragm, the external intercostal muscles and the position of diaphragm during inspiration and expiration?

           (c) Why do the walls of trachea not collapse, when there is less air in it?

Q16.  Santosh told his father that plants give out a lot of water in the form of vapour through leaves. Define this process.  What is its importance? How do stomata help in this process?

Q17.  Explain the digestion of a roti in human beings. Draw a diagram depicting human alimentary canal.

Q18.       Name a circulatory fluid in the human body other than blood. State its functions. How does it differ from blood?

Q19.       Explain how deoxygenated blood travel from body to lung for purification. Draw well-labelled diagram in support of your answer.         

Q20.       Plants absorb water from the soil. How does this water reach to the top of the tree? Explain in detail.

Q21.       (i)  How does food prepared by leaves is utilised by roots? Explain.

                 (ii)  Water is absorbed by roots and lost through leaves. How does this happen?

Q22.    What is the difference between excretion and defecation? Explain the process of excretion in humans.


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