Q9 of 86 Page 152

Complete the following table with the different types of tropism:


The directional movement of plant parts in response to stimulus light is called phototropism. The directional movement of plant parts in response to stimulus earth’s gravity is called geotropism. The directional movement of plant parts in response to water is called hydrotropism. Roots bend away from light so they are negatively phototropic. Roots bend towards water and earth’s gravity so they are positively hydrotropic and geotropic respectively. Shoot bends towards light but bends away from earth’s gravity so it is positively phototropic but negatively geotropic. It shows no response to water.


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7

Draw the diagram of open stoma and label the parts.

 8

A potted plant is kept horizontally for a considerable time. The three positions of the part A and B of the potted plant are shown in the following figures.

(i) Potted plant with shoot and root growing downward. (Diagram to be drawn)



(ii)


(iii) Potted plant with shoot and root growing upward (Diagram to be drawn)



a) Which figure shows the correct position taken by the parts A and B of the plant?


b) What type of phenomenon is exhibited by the figure by (A) in the figure (ii)?

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Cover the tip of the shoot with tin foil cap and light it from the side as shown in the given picture. What would you expect to happen? Why?

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In the given photosynthetic experiment, what will happen to the leaf closed with black paper in starch test? Why?