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Byju's Answer
Standard VII
Biology
Photosynthesis Process
If only green...
Question

If only green areas of the leaf perform photosynthesis, what is the point of having white colored areas in a leaf?


A

Plants use the white areas for decoration.

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B

Plants use the white areas to store sunlight.

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C

Plants have no use for the white areas on the leaves.

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D

Plants store starch in the white areas of the leaf.

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Solution

The correct option is D

Plants store starch in the white areas of the leaf.


The white areas of the leaf store food (as starch) that is produces in the green areas of the leaf. The plant can then use this stored food whenever it needs more food such as for producing fruits and flowers.


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Q. Question 1. What happens to the colour of the leaf? What is the colour of the solution?

  • Now dip the leaf in a dilute solution of iodine for a few minutes.
  • Take out the leaf and rinse off the iodine solution.
  • Observe the colour of the leaf and compare this with the tracing of the leaf done in the beginning.
Question 2. What can you conclude about the presence of starch in various areas of the leaf?
Q.

A plant has leaves that are partly green and partly white. The plant is destarched and a leaf is partly covered by black paper.

The plant is placed in bright light for several hours. Four discs are then cut from the leaf in the positions shown and are tested for starch.

Which discs contain starch?


Q. In the experiment to show that sunlight is necessary for photosynthesis:
(a) What is done to destarch the green leaves of the potted plant initially?
(b) What is done to a part of destarched leaf so that photosynthesis may not take place in that part of the leaf (before keeping the potted plant in sunlight)?
(c) How is chlorophyll removed from the green leaf before further testing?
(d) Which reagent is used to test the presence/absence of starch in the parts of experimental leaf?
Q. In a particular plant, two genes control leaf shape and fruit color. Round leaves (R) are dominant to jagged leaves (r). Yellow fruits (Y) are dominant to white fruits (y). A true-breeding round-leaved, yellow-fruited plant is crossed with a jagged-leaved, white-fruited plant. What are the genotypes of the parent plants involved in this cross?
Q. A pure breeding plant with red dot on leaves was crossed with pure breeding white dotted plants. The heterozygotes have both red and white dots. On self pollination of F1, what fraction of plants show both red and white dot on leaves ________________.
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