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Biology - Exemplar

13. Photosynthesis in Higher Plants

1. The Living World
2. Biological Classification
3. Plant Kingdom
4. Animal Kingdom
5. Morphology of Flowering Plants
6. Anatomy of Flowering Plants
7. Structural Organisation in Animals
8. Cell : The Unit of Life
9. Biomolecules
10. Cell Cycle and Cell Division
11. Transport in Plants
12. Mineral Nutrition
13. Photosynthesis in Higher Plants
14. Respiration in Plants
15. Plant Growth and Development
16. Digestion and Absorption
17. Breathing and Exchange of Gases
18. Body Fluids and Circulation
19. Excretory Products and Their Elimination
20. Locomotion and Movement
21. Neural Control and Coordination
22. Chemical Coordination and integration
Model Question Paper

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Q. 20

Suppose Euphorbia and Maize are grown in the tropical area.

a. Which one of them do you think will be able to survive under such conditions?

b. Which one of them is more efficient in terms of photosynthetic activity?

c. What difference do you think are there in their leaf anatomy?

Class 11th Biology - Exemplar 13. Photosynthesis in Higher Plants

Answer :

a) Euphorbia is a CAM plant. It fixes CO₂ during night and uses it in daytime. It will be able to survive in hot tropical climate. Maize is a tropical plant. It undergoes C4 cycle and can easily survive in hot climate.

b) Maize being a C4 plant is more efficient in terms of photosynthetic activity C4 plants have low CO₂ compensation point (0-10 ppm) and rate of carbon assimilation is rapid. Rate of photorespiration is negligible. C4 plants can perform photosynthesis even when the stomata are closed.

c) Euphorbia has large sized succulent cells and stomata having reniform guard cells closed during the day. Maize plant leaves have kranz anatomy. Stomata possess dumbbell shaped guard cells. The stomata remain open during the day.

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PREVIOUSA cyclic process is occurring in C3 plant, which is light dependent, and needs O2. This process doesn’t produce energy rather it consumes energy.a. Can you name the given process?b. Is it essential for survival?c. What are the end products of this process?d. Where does it occur?NEXTIs it correct to say that photosynthesis occurs only in leaves of a plant? Besides leaves, what are the other parts that may be capable of carrying out photosynthesis? Justify.

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