Question

If we place a potted plant in a dark room and test for starch will it test positive?

Answer 1

Answer:

As Rohit has placed the potted plant in a complete dark room for 3 days, the leaf will lack starch . ... Hence, the test for the presence of starch in the leaf will not give a positive result for sure because light is the basic requirement of starch formation .

Answer 2

Answer:

Explanation:

The leaf from a potted plant which was kept in a dark room for 24 hours when tested for starch will not turn blue-black (starch is tested with iodine which gives a blue-black colour if present).