ICSE Class 6 Biology - The Leaf - Test 3 (Advanced)
1. If a plant receives very low sunlight, photosynthesis will:
A. Increase rapidly
B. Decrease
C. Remain same
2. A leaf turns blue-black with iodine solution because it contains:
A. Protein
B. Fat
C. Starch
3. Why is a plant kept in darkness before a photosynthesis experiment?
A. To remove stored starch
B. To increase chlorophyll
C. To speed up growth
4. In a variegated leaf, photosynthesis occurs only in:
A. White parts
B. Green parts
C. Stem parts
5. Stomata are more on the lower surface mainly to:
A. Increase food production
B. Help root growth
C. Reduce water loss
6. Desert plants usually have small leaves because they:
A. Reduce water loss
B. Increase photosynthesis only
C. Store food
7. Floating leaves of aquatic plants help the plant by:
A. Increasing root growth
B. Providing buoyancy
C. Stopping photosynthesis
8. Shade leaves are usually adapted to:
A. Store water
B. Reduce transpiration completely
C. Capture more light
9. Many plants close stomata during midday to:
A. Reduce water loss
B. Increase food storage
C. Absorb minerals
10. Wilting of leaves mainly occurs due to:
A. Excess sunlight
B. Loss of water from cells
C. Extra oxygen
11. If food transport in a plant is blocked, it mainly affects:
A. Water absorption
B. Oxygen release
C. Growth of plant parts
12. Leaf veins mainly help in:
A. Mechanical support
B. Seed formation
C. Root absorption
13. Guttation in leaves occurs through:
A. Stomata
B. Hydathodes
C. Root hairs
14. Without light, chlorophyll cannot:
A. Absorb water
B. Form roots
C. Make food
15. Removing leaves from a plant will:
A. Reduce food production
B. Increase root growth
C. Improve flowering instantly
16. Water rises in plants mainly due to:
A. Gravity
B. Transpiration pull
C. Soil pressure
17. If carbon dioxide is removed, a plant will:
A. Grow faster
B. Produce more oxygen
C. Stop making food
18. Leaves are specially adapted for:
A. Food production
B. Movement
C. Digestion
19. Leaf adaptations mainly depend on:
A. Animal feeding
B. Environment
C. Soil color
20. Difference between desert and rainforest leaves is mainly due to:
A. Flower type
B. Root size
C. Water availability