Life Process

Here are 20 multiple-choice questions (MCQs) from the chapter "Life Processes" (Class 10 Science):

1. Which of the following is NOT a life process?

a) Respiration
b) Excretion
c) Photosynthesis
d) Reproduction

2. What is the main purpose of nutrition in living organisms?
a) To remove waste materials
b) To release energy
c) To provide energy and materials for growth
d) To transport oxygen

3. Which type of nutrition is observed in amoeba?
a) Holozoic
b) Saprophytic
c) Parasitic
d) Autotrophic

4. Which pigment is responsible for photosynthesis in plants?
a) Haemoglobin
b) Chlorophyll
c) Keratin
d) Melanin

5. The energy-rich molecule produced in respiration is:
a) DNA
b) ATP
c) RNA
d) NADPH

6. Which part of the plant absorbs water for photosynthesis?
a) Stem
b) Leaves
c) Roots
d) Flowers

7. In which organelle does photosynthesis occur?
a) Mitochondria
b) Ribosome
c) Chloroplast
d) Nucleus

8. Which gas is released during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen

9. Which type of respiration occurs in the absence of oxygen?
a) Aerobic respiration
b) Anaerobic respiration
c) External respiration
d) Internal respiration

10. What is the main function of the human circulatory system?
a) To digest food
b) To transport oxygen and nutrients
c) To absorb nutrients
d) To release energy

11. Which blood vessel carries oxygenated blood from the lungs to the heart?
a) Pulmonary artery
b) Pulmonary vein
c) Aorta
d) Vena cava

12. Which part of the human digestive system absorbs nutrients?
a) Stomach
b) Large intestine
c) Small intestine
d) Liver

13. The main excretory organ in humans is:
a) Lungs
b) Kidneys
c) Heart
d) Intestine

14. Which structure prevents food from entering the windpipe?
a) Diaphragm
b) Epiglottis
c) Trachea
d) Alveoli

15. What is the role of haemoglobin in blood?
a) Transport carbon dioxide
b) Transport oxygen
c) Clot blood
d) Fight infections

16. What is the main function of stomata in plants?
a) Water absorption
b) Gaseous exchange
c) Photosynthesis
d) Transport of nutrients

17. Where does aerobic respiration take place in cells?
a) Nucleus
b) Chloroplast
c) Mitochondria
d) Golgi body

18. Which blood component helps in clotting?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma

19. The enzyme present in saliva that helps in digestion is:
a) Pepsin
b) Trypsin
c) Amylase
d) Lipase

20. Which process helps in the removal of metabolic waste from the body?
a) Circulation
b) Excretion
c) Digestion
d) Respiration

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Here are the answers to the 20 MCQs from the chapter "Life Processes" (Class 10 Science):

Answers

1. d) Reproduction (It is not an essential life process for an individual's survival.)

2. c) To provide energy and materials for growth

3. a) Holozoic (Amoeba engulfs food particles through phagocytosis.)

4. b) Chlorophyll (It captures sunlight for photosynthesis.)

5. b) ATP (Adenosine Triphosphate stores and transfers energy.)

6. c) Roots (They absorb water and minerals from the soil.)

7. c) Chloroplast (Site of photosynthesis in plants.)

8. b) Oxygen (A by-product of photosynthesis.)

9. b) Anaerobic respiration (It occurs in the absence of oxygen.)

10. b) To transport oxygen and nutrients (Blood carries these throughout the body.)

11. b) Pulmonary vein (It carries oxygenated blood from the lungs to the heart.)

12. c) Small intestine (It absorbs nutrients into the bloodstream.)

13. b) Kidneys (They filter waste and excess water from blood.)

14. b) Epiglottis (It prevents food from entering the trachea.)

15. b) Transport oxygen (Haemoglobin binds with oxygen for transport.)

16. b) Gaseous exchange (Stomata help in CO₂ and O₂ exchange in plants.)

17. c) Mitochondria (The powerhouse of the cell, where aerobic respiration occurs.)

18. c) Platelets (They help in blood clotting.)

19. c) Amylase (Salivary amylase breaks down starch into maltose.)

20. b) Excretion (It removes metabolic waste from the bod

y.)

Let me know if you need explanations for any answers!