Plants carry out vital life processes like photosynthesis, respiration, transpiration, and transportation of food and water. This chapter explains how plants make their own food, exchange gases, and maintain balance in nature. The following MCQs will help you test your knowledge of Class 7 Science Chapter 10: Life Processes in Plants.
MCQ for Class 7 Science Chapter 10 Life Processes in Plants with Answers
Question 1: What is the process by which green plants prepare their own food?
a) Respiration
b) Photosynthesis
c) Transpiration
d) Germination
Answer:
b) Photosynthesis — It is the process by which green plants prepare their own food using sunlight, water, and carbon dioxide.
Question 2: Which gas is released during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer:
b) Oxygen — Plants release oxygen during the process of photosynthesis.
Question 3: What is the green pigment present in leaves that helps in photosynthesis?
a) Hemoglobin
b) Chlorophyll
c) Carotene
d) Xanthophyll
Answer:
b) Chlorophyll — Chlorophyll absorbs sunlight to enable photosynthesis.
Question 4: Which part of the plant primarily carries out photosynthesis?
a) Roots
b) Stem
c) Leaves
d) Flowers
Answer:
c) Leaves — Leaves are the main site of photosynthesis in plants.
Question 5: Stomata are present mainly on which part of the leaf?
a) Upper surface
b) Lower surface
c) Stem
d) Roots
Answer:
b) Lower surface — Stomata are tiny pores present mainly on the lower surface of leaves.
Question 6: Which process in plants involves the loss of water as vapor through stomata?
a) Respiration
b) Photosynthesis
c) Transpiration
d) Osmosis
Answer:
c) Transpiration — It is the process of water loss as vapor through stomata.
Question 7: Which tissue transports water and minerals from roots to leaves?
a) Phloem
b) Xylem
c) Epidermis
d) Cortex
Answer:
b) Xylem — Xylem transports water and minerals in plants.
Question 8: Which tissue carries prepared food from leaves to other parts of the plant?
a) Xylem
b) Phloem
c) Cambium
d) Cortex
Answer:
b) Phloem — Phloem transports food to different plant parts.
Question 9: Which gas do plants absorb during photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer:
b) Carbon dioxide — Plants absorb carbon dioxide from air for photosynthesis.
Question 10: What is the primary source of energy for photosynthesis?
a) Water
b) Sunlight
c) Oxygen
d) Minerals
Answer:
b) Sunlight — Sunlight provides energy for photosynthesis.
Question 11: Transpiration helps in which of the following?
a) Seed germination
b) Transport of minerals
c) Cooling of plant
d) All of these
Answer:
d) All of these — Transpiration helps in cooling, mineral transport, and water movement.
Question 12: Which of the following is NOT required for photosynthesis?
a) Carbon dioxide
b) Water
c) Oxygen
d) Sunlight
Answer:
c) Oxygen — Oxygen is not required but released during photosynthesis.
Question 13: In which part of the plant does most respiration occur?
a) Roots
b) Leaves
c) Flowers
d) All parts
Answer:
d) All parts — Respiration occurs in all living parts of the plant.
Question 14: Which type of plants use nitrogen-fixing bacteria in their roots?
a) Leguminous plants
b) Non-leguminous plants
c) Conifers
d) Grasses
Answer:
a) Leguminous plants — They form root nodules with nitrogen-fixing bacteria.
Question 15: Which plant part absorbs water and minerals from the soil?
a) Leaves
b) Stem
c) Roots
d) Flowers
Answer:
c) Roots — Roots absorb water and minerals from the soil.
Question 16: The loss of water in liquid form from leaf margins is called?
a) Transpiration
b) Photosynthesis
c) Guttation
d) Absorption
Answer:
c) Guttation — Water is lost in liquid form through hydathodes.
Question 17: Which part of the leaf captures sunlight for photosynthesis?
a) Veins
b) Stomata
c) Chloroplasts
d) Cuticle
Answer:
c) Chloroplasts — They contain chlorophyll to capture sunlight.
Question 18: What is the process of food transportation in plants called?
a) Diffusion
b) Translocation
c) Transpiration
d) Photosynthesis
Answer:
b) Translocation — Phloem carries food by translocation.
Question 19: The opening and closing of stomata is controlled by?
a) Root hairs
b) Guard cells
c) Veins
d) Mesophyll cells
Answer:
b) Guard cells — Guard cells control stomatal opening and closing.
Question 20: Which form of energy is used in photosynthesis?
a) Chemical energy
b) Solar energy
c) Heat energy
d) Electrical energy
Answer:
b) Solar energy — Solar energy is converted into chemical energy.
Question 21: Which of these is the food prepared during photosynthesis?
a) Proteins
b) Starch
c) Vitamins
d) Minerals
Answer:
b) Starch — Plants prepare starch (carbohydrates) during photosynthesis.
Question 22: What is the main function of root hairs?
a) Photosynthesis
b) Absorption of water and minerals
c) Transpiration
d) Storage of food
Answer:
b) Absorption of water and minerals — Root hairs increase surface area for absorption.
Question 23: Which element is essential for the synthesis of chlorophyll?
a) Nitrogen
b) Calcium
c) Iron
d) Magnesium
Answer:
d) Magnesium — Magnesium is a key element in chlorophyll.
Question 24: Which process releases energy in plants?
a) Photosynthesis
b) Transpiration
c) Respiration
d) Germination
Answer:
c) Respiration — Respiration releases energy in plants.
Question 25: What is the by-product of respiration?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Water vapor
Answer:
b) Carbon dioxide — Respiration produces carbon dioxide and water.
Question 26: Which of the following is an example of a climbing plant?
a) Mango
b) Pea
c) Banyan
d) Neem
Answer:
b) Pea — Pea is a climbing plant.
Question 27: Which of the following factors affects photosynthesis?
a) Light
b) Water
c) Carbon dioxide
d) All of these
Answer:
d) All of these — Photosynthesis is affected by light, water, and CO₂.
Question 28: Which part of the leaf transports water?
a) Stomata
b) Xylem veins
c) Cuticle
d) Epidermis
Answer:
b) Xylem veins — They transport water to leaves.
Question 29: What is the process of conversion of water into vapor from aerial parts of the plant?
a) Transpiration
b) Photosynthesis
c) Respiration
d) Guttation
Answer:
a) Transpiration — Loss of water vapor through aerial parts.
Question 30: Which plant structure anchors the plant to the soil?
a) Stem
b) Roots
c) Leaves
d) Flowers
Answer:
b) Roots — Roots fix the plant in the soil.
Question 31: What is the role of phloem?
a) Transport of water
b) Transport of minerals
c) Transport of food
d) Absorption of nutrients
Answer:
c) Transport of food — Phloem transports food prepared in leaves.
Question 32: Which process enables exchange of gases in leaves?
a) Stomatal activity
b) Phloem
c) Xylem
d) Diffusion in roots
Answer:
a) Stomatal activity — Stomata allow gas exchange.
Question 33: Which part of the plant conducts food to non-green tissues?
a) Cambium
b) Phloem
c) Xylem
d) Cortex
Answer:
b) Phloem — Phloem transports food to all tissues.
Question 34: What type of energy transformation occurs in photosynthesis?
a) Chemical to heat
b) Solar to chemical
c) Electrical to heat
d) Heat to chemical
Answer:
b) Solar to chemical — Solar energy is converted to chemical energy.
Question 35: Which of the following gases is produced during respiration?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer:
c) Carbon dioxide — Respiration produces carbon dioxide.
Fill in the Blanks Questions for Class 7 Science Chapter 10 Life Processes in Plants MCQ
1. The process by which green plants prepare their own food is called ___.
Answer:
Photosynthesis
2. The green pigment present in leaves that captures sunlight is ___.
Answer:
Chlorophyll
3. During photosynthesis, plants take in ___ gas from the air.
Answer:
Carbon dioxide
4. The gas released during photosynthesis is ___.
Answer:
Oxygen
5. Tiny pores on the surface of leaves through which exchange of gases takes place are called ___.
Answer:
Stomata
6. The process by which plants lose water vapor through stomata is called ___.
Answer:
Transpiration
7. The tissue that transports water and minerals from roots to leaves is called ___.
Answer:
Xylem
8. The tissue that transports food prepared in leaves to other parts of the plant is called ___.
Answer:
Phloem
9. The process of transportation of food in plants is known as ___.
Answer:
Translocation
10. The energy required for photosynthesis is obtained from ___.
Answer:
Sunlight
11. The liquid water lost from the edges of leaves in the early morning is due to ___.
Answer:
Guttation
12. The energy stored in the food prepared by plants is in the form of ___ energy.
Answer:
Chemical
13. The cells that control the opening and closing of stomata are called ___.
Answer:
Guard cells
14. Magnesium is an essential element for plants because it is a part of ___ molecule.
Answer:
Chlorophyll
15. The carbohydrate stored in plants as a result of photosynthesis is ___.
Answer:
Starch
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