Most important question of life process

 30 most repeated CBSE Class 10 Science (Life Processes) questions based on previous year board exams (last ~4 years and earlier trends) — and the year in which each question was asked wherever available. This list is extremely useful for revision and board preparation. 

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📘 Life Processes (Class 10 CBSE Science) — 30 Most Repeated Board Questions with Years

Boost your preparation with the most asked questions from the Life Processes chapter! These are collected from CBSE papers and important PYQ compilations to help you score high. 🌿🧠

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🍃 A. Definitions & Basic Concepts

1. Define life processes and list the basic life processes common to all organisms. (Repeated many times — e.g., Board Exams) 

2. What is photosynthesis? (Common in multiple years)

3. Write the balanced chemical equation for photosynthesis. (Often asked) 

4. State the raw materials required for photosynthesis. (2020) 

5. Explain the role of chlorophyll in photosynthesis. (Frequently asked) 

6. What are enzymes? Give one example from human digestion. (Often included in PYQs) 

🍽️ B. Nutrition & Digestion

7. Most of the digestion and absorption of food takes place in the — (a) small intestine (b) stomach (c) liver (d) large intestine. (2020) 

8. State the location and function of gastric glands. (2014) 

9. State the role of trypsin and lipase in digestion. (2020 — from PYQ compilations) 

10. What will happen if less saliva is secreted in the mouth? (2025) 

11. Name enzymes present in the human digestive system and their functions. (Repeated in several specimen papers) 

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💨 C. Respiration

12. Define respiration. (Previous papers)

13. Differentiate between aerobic and anaerobic respiration. (Repeated & seen in PYQs) 

14. Why is respiratory pigment needed in multicellular organisms? (2024) 

15. Difference between breathing and respiration. (asked repeatedly before 2020) 

16. Describe how breathing occurs in humans with a neat diagram. (Frequently asked in board papers) 

🌿 D. Transport in Plants & Animals

17. Explain how water and minerals are transported in plants. (Repeated) 

18. What is translocation? Which tissue is responsible for it? (Repeated) 

19. Name the pigment present in red blood cells and its role. (Commonly asked)

20. Which blood vessel carries oxygenated blood from lungs to heart? (2017) 

21. What is the function of capillaries in the circulatory system? (Repeated across sample/board papers)

22. Which one of the following statements is correct about the human circulatory system? — Valves ensure that blood does not flow backwards. (2020) 

🩸 E. Excretion

23. Define excretion. (Common short-answer) 

24. Name the organs of the human excretory system. (Repeated)

25. Explain how urine is formed in the human body. (2020) 

26. Name four types of metabolic wastes produced by humans. (2013/earlier)

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📊 F. Application & Reason-Based Questions

27. Why do desert plants close their stomata during the day yet perform photosynthesis? (Seen in many important questions lists) 

28. Give reason: Stomata close when water flows out of guard cells. (2024 MCQ style)

29. Why is diffusion insufficient to meet oxygen needs of multicellular organisms? (Board Term I, 2017) 

30. Suggest reasons for the movement of food in the alimentary canal. (Appears in important questions) 

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✨ Exam Preparation Tips for Life Processes

✔ Practice PYQs and sample papers — Revise board questions which are repeated. 
✔ Focus on diagrams — digestive system, respiratory system, heart ,stomata, and nephron are high-yield.
✔ Know definitions and processes word-to-word — Read NCERT carefully.