Grade 4 Science Green Plants

Here’s a Grade 4 Science Test Paper on “Green Plants,” followed by an Answer Key with explanations.

Grade 4 Science Test: Green Plants

Section A: Multiple Choice Questions (MCQs) (1 mark each)

1. Which part of a plant absorbs water and nutrients from the soil?
   1. Leaf
   2. Root
   3. Stem
   4. Flower
2. The green color of leaves is due to the presence of:
   1. Hemoglobin
   2. Chlorophyll
   3. Melanin
   4. Carotene
3. What is the process through which plants make their food?
   1. Respiration
   2. Germination
   3. Photosynthesis
   4. Pollination
4. Which gas do plants take in during photosynthesis?
   1. Oxygen
   2. Nitrogen
   3. Carbon dioxide
   4. Hydrogen
5. The food prepared by plants is stored in the form of:
   1. Protein
   2. Sugar
   3. Starch
   4. Fat

Section B: Fill in the Blanks (1 mark each)

6. Plants take in carbon dioxide through tiny openings called _______.
7. The process of losing water in the form of vapor from the leaves is called _______.
8. _______ is the primary source of energy for plants during photosynthesis.
9. The part of the plant responsible for transporting water from roots to leaves is the _______.
10. The food prepared by plants is transported to different parts through _______.

Section C: True or False (1 mark each)

11. Green plants can survive without sunlight.
12. Plants release oxygen during photosynthesis.
13. The stem helps absorb water from the soil.
14. Chlorophyll is found in flowers.
15. Photosynthesis takes place in plant roots.

Section D: Short Answer Questions (2 marks each)

16. Why are leaves called the “food factory” of plants?
17. Mention any two functions of roots.
18. How does transpiration help plants?
19. Explain the importance of photosynthesis for life on Earth.
20. What would happen if plants stopped photosynthesis?

Answer Key & Explanations

Section A: Multiple Choice Questions

1. b) Root – Roots absorb water and nutrients needed for plant growth.
2. b) Chlorophyll – This pigment captures sunlight for photosynthesis.
3. c) Photosynthesis – Plants make food using sunlight, carbon dioxide, and water.
4. c) Carbon dioxide – Plants take in carbon dioxide to convert into glucose.
5. c) Starch – Excess food in plants is stored as starch.

Section B: Fill in the Blanks

6. Stomata – Tiny pores in leaves help gas exchange.
7. Transpiration – This process releases excess water vapor into the air.
8. Sunlight – Plants use sunlight as the main energy source for photosynthesis.
9. Stem – It transports water from roots to leaves.
10. Phloem – Phloem carries food to different parts of a plant.

Section C: True or False

11. False – Without sunlight, photosynthesis cannot occur.
12. True – Oxygen is released during photosynthesis.
13. False – Roots, not stems, absorb water from the soil.
14. False – Chlorophyll is found in leaves, not flowers.
15. False – Photosynthesis takes place in leaves.

Section D: Short Answer Questions

16. Leaves contain chlorophyll, which captures sunlight and helps in photosynthesis. They prepare food for the plant, earning them the name “food factory.”
17. Roots help absorb water and nutrients from the soil and anchor the plant.
18. Transpiration helps cool the plant, maintain moisture balance, and facilitate water movement.
19. Photosynthesis produces oxygen and food, sustaining plant life and supporting all living organisms.
20. Without photosynthesis, plants would die, leading to a collapse in the food chain as animals and humans rely on plants for food and oxygen.

This test paper covers all key concepts of green plants for Grade 4 😊