Class 11 Biology - Chapter Photosynthesis in Higher Plants NCERT Solutions | Look at leaves of the same plant on the
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?
Light is a limiting factor for photosynthesis. Leaves get lesser light for photosynthesis when they are in shade. Therefore, the leaves or plants in shade perform lesser photosynthesis as compared to the leaves or plants kept in sunlight.
In order to increase the rate of photosynthesis, the leaves present in shade have more chlorophyll pigments. This increase in chlorophyll content increases the amount of light absorbed by the leaves, which in turn increases the rate of photosynthesis. Therefore, the leaves or plants in shade are greener than the leaves or plants kept in the sun.
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:- 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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3 Comment(s) on this Question
Is the answer is rightâ
This answer says just the opposite of answer 6th. Please correct it
For question number seven, the last paragraph contradicts with the answer given in the previous question (i.e. number 6). So, do plants become greener in the shade, or do they turn yellow? Because, the previous question's answer states that if the chlorophyll pigments don't receive enough light, then they stop production and break down, hence allowing the xanthophyll and carotenoids to dominate, and turning the leaves yellow; but here it's stating that leaves in the shade will have MORE chlorophyll pigments to compromise for the lack of light. But, aren't they supposed to diminish in sunlight?
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