The Reproductive System — Biology STD 10 — Question

State how does meiosis maintains chromosome number in a species.

Name the following:
Inability to speak.

Name the Following
The blood vessels which have valves in them.

Name the Following :
The tubular knot fitting like a cap on the upper surface of the testes.

Define the following:
Plant pigments

Name the following :
The condition in which the water from a cell is completely removed due to exosmosis and no more shrinkage is ssible.

A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
Why was the plant placed in the dark before beginning the experiment?

With reference to the human ear, answer the question that follow:

Give the technical term for the structure found in the inner ear.

Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.
Explain briefly the role of the following structures in this process Guard cells.

The fundamental unit of heredity