Class 11 Biology - Chapter Photosynthesis in Higher Plants NCERT Solutions | Give comparison between the following: (
Give comparison between the following:
(a) C3 and C4 pathways
(b) Cyclic and non-cyclic photophosphorylation
(c) Anatomy of leaf in C3 and C4 plants
(a) C3 and C4 pathways
|
C3 pathways |
C4 pathways |
||
|
1. |
The primary acceptor of CO2 is RUBP – a six-carbon compound. |
1. |
The primary acceptor of CO2 is phosphoenol pyruvate – a three-carbon compound. |
|
2. |
The first stable product is 3-phosphoglycerate. |
2. |
The first stable product is oxaloacetic acid. |
|
3. |
It occurs only in the mesophyll cells of the leaves. |
3. |
It occurs in the mesophyll and bundle-sheath cells of the leaves. |
|
4. |
It is a slower process of carbon fixation and photo-respiratory losses are high. |
4. |
It is a faster process of carbon fixation and photo-respiratory losses are low. |
(b) Cyclic and non-cyclic photophosphorylations
|
Cyclic photophosphorylation |
Non-cyclic photophosphorylation |
||
|
1. |
It occurs only in photosystem I. |
1. |
It occurs in photosystems I and II. |
|
2. |
It involves only the synthesis of ATP. |
2. |
It involves the synthesis of ATP and NADPH2. |
|
3. |
In this process, photolysis of water does not occur. Therefore, oxygen is not produced. |
3. |
In this process, photolysis of water takes place and oxygen is liberated. |
|
4. |
In this process, electrons move in a closed circle. |
4. |
In this process, electrons do not move in a closed circle. |
(c) Anatomy of the leaves in C3 and C4 plants
|
C3 leaves |
C4 leaves |
||
|
1. |
Bundle-sheath cells are absent |
1. |
Bundle-sheath cells are present |
|
2. |
RuBisCo is present in the mesophyll cells. |
2. |
RuBisCo is present in the bundle-sheath cells. |
|
3. |
The first stable compound produced is 3-phosphoglycerate –a three-carbon compound. |
3. |
The first stable compound produced is oxaloacetic acid – a four-carbon compound. |
|
4. |
Photorespiration occurs |
4. |
Photorespiration does not occur |
More Questions From Class 11 Biology - Chapter Photosynthasis in Higher Plants
- Q:- Figure 13.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:
(a) At which point/s (A, B or C) in the curve is light a limiting factor?
(b) What could be the limiting factor/s in region A?
(c) What do C and D represent on the curve?
- Q:- By looking at a plant externally can you tell whether a plant is C3 or C4? Why and how?
- Q:- By looking at which internal structure of a plant can you tell whether a plant is C3 or C4? Explain.
- Q:- Even though a very few cells in a C4 plant carry out the biosynthetic Calvin pathway, yet they are highly productive. Can you discuss why?
- Q:- Suppose there were plants that had a high concentration of Chlorophyll-b, but lacked chlorophyll-a, would it carry out photosynthesis? Then why do plants have chlorophyll-b and other accessory pigments?
- Q:- Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?
- Q:- RuBisCo is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCo carries out more carboxylation in C4plants?
- Q:- Why is the colour of a leaf kept in the dark frequently yellow, or pale green? Which pigment do you think is more stable?
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2 Comment(s) on this Question
Correction in part a - RUBP is 5-carbon compound.
NCERT page no 221 give answer me please thank you very much for comment it is very helpful for my study and other student which is like me but it need more changesc thanku
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