NCERT Class 11 Biology Photosynthesis in Higher Plants

PHOTOSYNTHESIS IN HIGHER PLANTS

SHORT ANSWER TYPE QUESTIONS

1. Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic CO₂ requirements?

2. Chlorophyll ‘a’ is the primary pigment for light reaction. What are accessory pigments? What is their role in photosynthesis?

3. Do reactions of photosynthesis called, as ‘Dark Reaction’ need light? Explain.

4. How are photosynthesis and respiration related to each other?

5. If a green plant is kept in dark with proper ventilation, can this plant carry out photosynthesis? Can anything be given as supplement to maintain its growth or survival?

6. Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions?

7. In tropical rain forests, the canopy is thick and shorter plants growing below it, receive filtered light. How are they able to carry out photosynthesis ?

8. What conditions enable Rubis CO to function as an oxygenase? Explain the ensuing process.

9. Why does the rate of photosynthesis decrease at higher temperatures?

10. Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon.

11. Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar.

12. Six turns of Calvin cycle are required to generate one mole of glucose. Explain. 

13. Complete the flow chart for cyclic photophosphorylation of the photosystem-I

14.5. If a green plant is kept in dark with proper ventilation, can this plant carry out photosynthesis? Can anything be given as supplement to maintain its growth or survival?

6. Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions?

7. In tropical rain forests, the canopy is thick and shorter plants growing below it, receive filtered light. How are they able to carry out photosynthesis ?

8. What conditions enable Rubis CO to function as an oxygenase? Explain the ensuing process.

9. Why does the rate of photosynthesis decrease at higher temperatures?

10. Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon.

11. Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar.

12. Six turns of Calvin cycle are required to generate one mole of glucose. Explain.

13. Complete the flow chart for cyclic photophosphorylation of the photosystem-I

14. In what kind of plants do you come across ‘Kranz’ anatomy? To which conditions are those plants better adapted? How are these plants better adapted than the plants, which lack this anatomy?

15. A process is occurring throughout the day, in ‘X’ organism. Cells are participating in this process. During this process ATP, CO2 and water are evolved. It is not a light dependent process.

a. Name the process.

b. Is it a catabolic or an anabolic process?

c. What could be the raw material of this process?

16. Tomatoes, carrots and chillies are red in colour due to the presence of one pigment. Name the pigment. Is it a photosynthetic pigment?

17. Why do we believe chloroplast and mitochondria to be semi-autonomous organelle?

LONG ANSWER TYPE QUESTIONS

1. Is 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.

2. The entire process of photosynthesis consists of a number of reactions. Where in the cell do each of these take place?

a. Synthesis of ATP & NADPH __________________________

b. Photolysis of water __________________________

c. Fixation of CO2 __________________________

d. Synthesis of sugar molecule __________________________

e. Synthesis of starch __________________________

3. Which property of the pigment is responsible for its ability to initiate the process of photosynthesis? Why is the rate of photosynthesis higher in the red and blue regions of the spectrum of light?

4. What can we conclude from the statement that the action and absorption spectrum of photosynthesis overlap? At which wavelength do they show peaks?

5. Under what conditions are C4 plants superior to C3?

6. In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a, answer the followings:

a. What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.

b. How can we derive an absorption spectrum for any substance?

c. If chlorophyll a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?

7. What are the important events and end products of the light reaction?

8. In the diagram shown below label A, B, C. What type of phosphorylation is possible in this?

9. Why is the RuBisCo enzyme more appropriately called RUBP Carboxylase-Oxygenase and what important role does it play in photosynthesis?

10. What special anatomical features are displayed by leaves of C4 plants? How do they provide advantage over the structure of C3 plants?

11. Name the two important enzymes of C3 and C4 pathway, respectively? What important role do they play in fixing CO2?

12. Why is RuBisCo enzyme the most abundant enzyme in the world?

13. Why does not photorespiration take place in C4 plants?

Please refer to attached file for NCERT Class 11 Biology Photosynthesis in Higher Plants