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CBSE - Class 11 Biology Photosynthesis Worksheet

1.
Why is the colour of a leaf kept in the dark frequently becomes yellow, or pale green? Which pigment do you think is more stable?
2.
Give comparison between the following:
(c) Anatomy of leaf in $C_3$ and $C_4$ plants
3.
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?
4.

Figure 11.10 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 light is a limiting factor?

5.
By looking at a plant externally, can you tell whether a plant is $C_3$ or $C_4$? Why and how?
6.
By looking at which internal structure of a plant you can tell whether a plant is $C_3$ or $C_4$? Explain.
7.
Even though a very few cells in a $C_4$ plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?
8.
RuBisCO is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in $C_4$ plants?
9.

Figure 11.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions: (c) What do C and D represent on the curve?

10.
Give comparison between the following:
(a) $C_3$ and $C_4$ pathways
11.
Give comparison between the following:
(b) Cyclic and non-cyclic photophosphorylation
12.

Figure 11.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions: (b) What could be the limiting factor/s in region A?

13.
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?

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