Question

Discuss the experiment that show chlorophyll is necessary for photosynthesis

Answer 1

The green colour of a leaf is due to presence of chlorophyll . Although all leafs are green,some have white or yellow patches like spot on them , for example ,the leaf of Coleus. Such leaves are called variegated leaves. Only the green part of leaf shows production of starch . Carry out a starch test on a variegated leaf of a plant that has been kept in sunlight .Only those parts of the leaf will turn blue - black which were green , while the white or yellow patches remain unchanged . This shows that photosynthesis occurs only in chlorophyll - containing leaves.

Answer 2

Question :-

Discuss the experiment to show that chlorophyll is necessary for photosynthesis.

Answer :-

Material Required :

Potted crotton plant, Beaker, water, alcohol, iodine solution, testtube, petridish, tripod stand, bunsen burner, sheet of paper, pencil, dropper.

Procedure :

1. Take a leaf which is partially green.

2. Now put the plant in a place where, there is no light for 3days, this will removes the starch completely from the plant or put it in alcohol with some water.

3. Now on the 4th day, put the plant in the sunlight.

4. After few hours, pluck the leaf and put iodine solution on it.

Observation :

You will observe that the part of the leaf which were green at the starting turn into blue-black colour whereas the part of the leaf which is not green in colour has the colour of the iodine which is brown.

Result :

Hence, we can say that chlorophyll is necessary for the presence of photosynthesis.