Q7 of 86 Page 152

Draw the diagram of open stoma and label the parts.


Stomata are minute openings present on surface of leaves whose opening and closing are guarded by guard cells. Guard cells have thick inner walls and thin outer walls. They have chloroplasts within them. Stomata open during day time when guard cells turn turgid. The cells surrounding the guard cells are called epidermal cells.


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Define photosynthesis.

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Suppose you have a rose plant growing in a pot, how will you demonstrate transpiration in it?

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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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Complete the following table with the different types of tropism: