Question

b. A plant was kept in the dark for two to three days and then was shifted into bright
light for five hours. However, the plant was deprived of carbon dioxide. Which of the
following will be the observation if a leaf from this plant is tested for the presence of starch?

i. Only the upper surface of the leaf will turn blue-black in colour

ii. The entire leaf will turn blue-black in colour

iii. The leaf will not turn blue-black in colour

iv. Only the lower surface of the leaf will turn blue-black in colour

Please answer the question it's very urgent.​

Answer 1

Answer:

b. the starch is not present as the plant was kept in dark for three days

i The part of leaf that contains starch will turn blue black.

ii When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown.

iii You will observe that leaves do not turn blue-black in colour

iv When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown.