Question

Q-7 Describe an experiment to prove that - Plant leaf has starch.​

Answer 1

Explanation:

The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then put two drops of iodine solution, it is colour change to blue indicates the presence of starch.

Answer 2

Answer:

1

Explanation:

Leaves make starch as food by photosynthesis. The presence of starch in leaves can be tested as follows -

i) Pluck a green leaf from a plant

ii) Boil the leaf in alcohol to remove the green pigment chlorophyll from it .

iii) Wash the decolourised leaf with water to remove any chlorophyll sticking to it

iv )Pour dilute iodine solution from a dropper over the decolourised leaf.

v) Appearance of blue black colour in leaf shows the presence of starch in it.