Plant Growth and Development — BIOLOGY STD 11 Science — Question

Represent diagrammatically a cell in early and late prophase.

How are conifer needles helpful in soil erosion?

The backbone of DNA molecule is formed of two different molecules. Name them.

Which enzyme is present in bacteriophages?

Arrange the following in the sequence you would find them in a plant starting from the periphery-phellem, phellogen, phelloderm.

What should happen to maintain the growth rate?

In jaundice, the eyes and skin of a person become yellow. Discuss the reason for it.

What is ABA which is also called stress hormone?

Vinay was going through an industrial area with his grandfather. While on the way, he felt suffocated and dizzy due to the smoke coming out of the factory. Vinay got angry and started shouting that all these factories should be closed. His grandfather calms him down and explained that it is due to large scale cutting of trees for urbanization and industrialization which has disturbed the balance of atmospheric gases. He also explained various economic importance of plants.

1. Large scale cutting of trees leads to ___________________?
2. What initiatives should be taken to maintain the atmospheric balance.
3. Give various economic importance of plants.
4. What values are shown by his grandfather?

Give the name of the pigment, which imparts colour to red algae.