Class 11 Biology - Chapter Photosynthesis in Higher Plants NCERT Solutions | RuBisCo is an enzyme that acts both as a
Welcome to the NCERT Solutions for Class 11th Biology - Chapter Photosynthesis in Higher Plants. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 4: rubisco is an enzyme that acts both as a carboxyla....
Question 4
RuBisCo is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCo carries out more carboxylation in C4plants?
Answer
The enzyme RuBisCo is absent from the mesophyll cells of C4 plants. It is present in the bundle-sheath cells surrounding the vascular bundles. In C4 plants, the Calvin cycle occurs in the bundle-sheath cells. The primary CO2 acceptor in the mesophyll cells is phosphoenol pyruvate – a three-carbon compound. It is converted into the four-carbon compound oxaloacetic acid (OAA). OAA is further converted into malic acid. Malic acid is transported to the bundle-sheath cells, where it undergoes decarboxylation and CO2fixation occurs by the Calvin cycle. This prevents the enzyme RuBisCo from acting as an oxygenase.
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:- 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 - 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:- 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
Adit Rana
2019-06-05 17:29:02
Thank for the answer...... Lots of thanks
GAURI GANDHI
2019-02-26 22:34:53
NICE ANSWER SIR . I ALWAYS PREFER YOUR SITE , TOMORROW I HAVE EXAM SAY ME BEST OF LUCK BROTHER !!!
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