Question

F. HOTS Questions:-

1. Why do the leaves of a plant kept in dark become yellow?

2. Why do insectivorous plants need to feed on insects when they can synthesise their food?

3. How does a soil become rich in nitrates when leguminous plants are grown in it?​

Answer 1

1. The plants which are kept in the darkare generally yellow, or pale green because the production of the chlorophyll pigment (essential for photosynthesis) is directly proportional to the amount of light available.Thus the leaf turns pale yellow.

2.The insectivorous plants grow in soil which do not contain sufficient nitrogen mineral. These plants (e.g.pitcher plant) are green and carry out photosynthesis to obtain a part of thefood required by them. So,insectivorous or carnivorous plants feed on insects to obtain the nitrogenneeded for their growth.

3.The nitrogen fixed by the bacterial cells are leached to soilsfrom the roots of leguminous plants in the form of ammonium, which is converted to nitrate by the nitrifying bacteria.

Answer 2

Answer:

pls tell me what are leaf