Life Processes — Class 10 Science

1. Which process converts light energy into chemical energy?

A) Respiration B) Transpiration C) Photosynthesis D) Fermentation

2. What is the main role of acid in the human stomach?

A) To digest fats B) To kill bacteria and activate pepsin C) To digest carbohydrates D) To neutralize bile

3. Which enzyme is primarily responsible for protein digestion in the stomach?

A) Amylase B) Pepsin C) Lipase D) Trypsin

4. Why do herbivores generally have longer small intestines than carnivores?

A) They eat less food B) Cellulose digestion requires longer time C) They have a faster metabolism D) They need more water absorption

5. Which secretion from the liver helps make the acidic food from the stomach alkaline in the small intestine?

A) Pancreatic juice B) Bile juice C) Saliva D) Gastric juice

6. What is the primary function of villi in the small intestine?

A) Absorption of digested food B) Secretion of bile C) Mechanical digestion D) Storage of food

7. Which sequence correctly represents aerobic respiration?

A) Glucose → Pyruvate → CO₂ + H₂O + Energy B) Glucose → Ethanol + CO₂ C) Glucose → Lactic acid only D) Glucose → Water only

8. What causes muscle cramps during sudden or intense activity?

A) Formation of lactic acid B) Excess ATP production C) Too much oxygen D) Buildup of bile

9. Which organism commonly performs alcoholic fermentation?

A) Yeast B) Human red blood cell C) Fish D) Amoeba

10. Which molecule is called the energy currency of the cell?

A) Glucose B) ATP C) NADH D) DNA

11. In humans, gas exchange (O₂ and CO₂) takes place mainly across the walls of the:

A) Bronchi B) Alveoli C) Trachea D) Larynx

12. Which respiratory pigment in human blood carries oxygen?

A) Chlorophyll B) Myoglobin C) Haemoglobin D) Keratin

13. Why do fishes open and close their mouths rapidly?

A) To pass water over the gills for oxygen uptake B) To chew food C) To cool their bodies D) To make sounds

14. What structural feature prevents collapse of the human trachea?

A) Rings of cartilage B) Smooth muscles C) Cilia only D) Alveoli

15. Which component of blood mainly transports digested food and dissolved wastes?

A) Plasma B) Red blood cells C) White blood cells D) Platelets

16. Which chamber of the heart pumps oxygenated blood to the rest of the body?

A) Left ventricle B) Right atrium C) Left atrium D) Right ventricle

17. What prevents backward flow of blood in veins?

A) Valves B) Thick walls C) Elastic recoil D) Cilia

18. Which of the following is considered a normal blood pressure reading for adults?

A) 120/80 mm Hg B) 80/120 mm Hg C) 200/100 mm Hg D) 60/40 mm Hg

19. What is the principal function of platelets in blood?

A) Blood clotting B) Transport oxygen C) Fight infection D) Produce hormones

20. What is lymph?

A) Colourless fluid which drains tissue fluid and transports absorbed fats B) Red fluid that carries oxygen C) Digestive juice in plants D) Liquid stored in alveoli

21. Which plant tissue is primarily responsible for transport of water and minerals?

A) Xylem B) Phloem C) Epidermis D) Cortex

22. Which plant tissue is responsible for translocation of food?

A) Xylem B) Phloem C) Cambium D) Endodermis

23. Loss of water vapour from the aerial parts of a plant is called:

A) Transpiration B) Translocation C) Respiration D) Photosynthesis

24. Movement of products of photosynthesis from leaves to other parts of the plant is called:

A) Transpiration B) Transfusion C) Transportation D) Translocation

25. Which organs filter the blood and form urine in humans?

A) Kidneys B) Liver C) Spleen D) Pancreas

26. What is the functional unit of the kidney?

A) Nephron B) Alveolus C) Neuron D) Hepatocyte

27. Which tubes carry urine from the kidneys to the urinary bladder?

A) Ureters B) Urethra C) Nephrons D) Fallopian tubes

28. Which gaseous waste is eliminated from the body by the lungs?

A) Carbon dioxide B) Urea C) Glucose D) Oxygen

29. What is the main nitrogenous waste excreted in human urine?

A) Urea B) Ammonia C) Uric acid D) Nitrogen gas

30. How do plants commonly get rid of or manage metabolic waste products?

A) Store wastes in vacuoles, resins or shed leaves B) Excrete urine like animals C) Breathe out urea D) Convert wastes to oxygen

Class 10 Science — Life Processes Part 1

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