Life Processes: Class 10 Previous Year Questions

Life Processes questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. Which structure in a leaf is mainly responsible for gaseous exchange ? 1. (A) Xylem (B) Stomata (C) Phloem (D) Cuticle
   Board 20261 markMCQ
2. Human brain has various parts or regions that help in different actions, responses and coordination. From the following, identify the part responsible for precision of voluntary actions : (A) Cerebrum (B) Cerebellum (C) Medulla (D) Pons Pancreas secretes pancr…
   Board 20261 markMCQ
3. (a) (i) “The length of the small intestine in various animals depends on the food they eat.” Justify the statement. (ii) Discuss the role of the pancreas and bile juice in the digestion of food in human beings. (iii) How is the small intestine designed to abso…
   Board 20255 markslong answer
4. The maintenance functions of all living organisms must go on even when they are not doing anything particular. Even when we are just sitting in a class or even asleep, this maintenance job has to go on. These maintenance processes require energy to prevent dam…
   Board 20254 marksshort answer
5. One-cell thick blood vessels are known as : (A) Alveoli (B) Capillaries (C) Arteries (D) Veins
   Board 20251 markMCQ
6. Assertion (A) : Animals will not get energy if they eat (consume) coal as food. Reason (R) : Specific enzymes are needed for the breakdown of a particular food.
   Board 20251 markAssertion-Reason
7. (i) Why is respiratory pigment needed in multicellular organisms with large body size ? Give reasons for the following : (ii) (a) Rings of cartilage are present in the throat. (b) Lungs always contain a residual volume of air. (c) The diaphragm flattens and ri…
   Board 20243 marksshort answer
8. (a) Give reasons for the following : (i) Alveoli in lungs are richly supplied with blood capillaries. (ii) Respiratory pigment in the blood takes up oxygen and not carbon dioxide. (ii) During anaerobic respiration, a 3-carbon molecule is formed as an end produ…
   Board 20243 marksshort answer
9. State one role of each of the following in human digestive system : 22. (i) Hydrochloric acid (i) Villi (ii) Anal Sphincter (iv) Lipase
   Board 20242 marksshort answer
10. Photosynthesis takes place in the leaves and the food prepared by it reaches other parts of the plants. Name the process involved and explain it. 13 (a) 24. (b) 3× 108/ 2V 12 () 1 · 3 f fa 1 28. 14
    Board 20242 marksshort answer
11. A stomata closes when : (i) it needs carbon dioxide for photosynthesis. (i) it does not need carbon dioxide for photosynthesis. (ii) water flows out of the guard cells. (iv) water flows into the guard cells. The correct reason(s) in this process is/are : (a) (…
    Board 20241 markMCQ
12. Which of the following statement(s) is (are) true about human heart ? (a) pulmonary artery. (b) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body. (c) Right atrium receives deoxygenated blood through vena cava…
    Board 20241 markMCQ
13. Name the part of the human excretory system where nephrons are found. Write the structure and function of nephrons.
    Board 20232 marksshort answer
14. Assertion (A) : Blood clotting prevents excessive loss of blood. Reason (R) : Blood clotting is due to blood plasma and white blood cells present in the blood.
    Board 20231 markAssertion-Reason
15. State the role of ATP in cellular respiration. 29. (i) (a) (i) What ensures sufficient exchange of gases in plants ? (iii) State the conditions on which the direction of diffusion of gases in plant depend upon. OR (b) (i) What is the internal energy reserve in…
    Board 20233 marksshort answer
16. H 16 H 30. S>amdZr n[apñW{V`m| _| _mZdm| _| _wº$ hmoZo dmbo hm°_m}Z H$m Zm_ Am¡a Cg hm°_m}Z H$mo òm{dV H$aZo dmbr J«§{W H$m Zm_ {b{IE & n[apñW{V H$m gm_Zm H$a gH$Zo Ho$ {bE eara {H$g àH$ma AZw{H«$`m H$aVm h¡ ?
    Board 20233 marksshort answer
17. (a) Write the role of insulin in regulating blood sugar levels in human body. Mention the disease caused due to it. (b) How is the timing and the amount of release of insulin in the blood regulated ?
    Board 20232 marksshort answer
18. (a) Name the type of blood (oxygenated / deoxygenated) transported by each of the following mentioning the path (i.e. from one organ (which place) to another (which place). (i) Vena cava (i) Pulmonary artery OR (b) With the help of a schematic flow chart, show…
    Board 20232 marksshort answer
19. H 13 H 22. (a) Why is it important to prevent oxygenated and deoxygenated blood from mixing in birds and mammals ? (b) Which animals can tolerate some mixing of the oxygenated and deoxygenated blood streams ? On what factor does the body temperature of these a…
    Board 20232 marksshort answer
20. Consider the following statements about small intestine and select the one which is NOT correct : (a) The length of the small intestine in animals differs as it depends on the type of food they eat. (b) The small intestine is the site of complete digestion of …
    Board 20231 markMCQ

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