Question

discuss the presence of starch in three different sample of plant cell( leave, potato and onion)

Answer 1

The answer is potato because we can conduct an experiment on starch.

Answer 2

ANSWER:

The 'presence of starch' can be tested with the 'help of iodine solution'. The foods which contain starch will 'turn blue-black' when iodine solution is put on them.

EXPLANATION:

LEAVES:

In leaves, 'iodine is essential' for the 'process of photosynthesis'. When iodine solution is put on leaves, the parts of leaves that contain chlorophyll will turn blue black showing the presence of starch.

POTATOES:

Potatoes contain starch and will turn blue black or brown when iodine solution is put on them. Potatoes store starch in the form of amylase.

ONIONS:

Onions remain unchanged in colour when iodine solution is out on them because they do not contain any starch.