Locomotion and Movement — BIOLOGY STD 11 Science — Question

Which of the following is not correct?

1. Robert Brown discovered the cell.
2. Schleiden and Schwann formulated the cell theory.
3. Virchow explained that cells are formed from pre-existing cells.
4. A unicellular organism carries out its life activities within a single cell.

Mention the conditions when only cyclic photophosphorylation occurs.

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?

Define autonomic nervous system.

What is the action of salivary amylase?

Supply the scientific terms for the following.

1. A period of suspended growth and even a period of rest is referred to as dormancy; usually occurs during the dry or cold season of the year.
2. A growth promoting substance first isolated from maize kernels.

List the hormones secreted by the following: G-I Tract.

Where does the exchange of gases take place in lungs?

Mention the two functions performed by the tentacles in Hydra.

Give main difference between influx and eflux of ions.