Question

Describe an activity to show that chlorophyll is necessary for photosynthesis

Answer 1

Answer:

Take a plant with variegated leaf having some green and some non-green areas.

ex coleus, germanium and croton.

• Destarch the leaves by keeping the plant in a dark room for a few days.

• Place th plant in the sun.

• After a few hours pluck one leaf.

• Mark its outline on paper and mark the green and non-green areas on the outline.

• Test the leaf for starch. Only the green parts of the leaf turn bluish, showing the presence of starch.

To test the leaf for starch

• Dip the leaf in boiling water for a minute to kill the cells.

• Boil thr leaf in methylated spirit over a water bath till it becomes pale white due to the removal of chlorophyll. The leaf now becomes hard and brittle.

• Place it again in hot water to soften it.

Spread the leaf in a dish and pour iodine solution on it. The presence of starch will indicate by a blue black colour.

A leaf without starch will show brown colouration.

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