The Nervous System and Sense Organs — Biology STD 10 — Question

The UV rays cause (genetic, mentally, physical) disorders which ultimately affect heredity.

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?

Where does the meiosis occur in our body?

Give Technical Terms: The surgical removal of testes.

All life on earth Would come to an end if there were no green plants.

Explain the Term:
Centromeres

Define the following:
Birth rate

Give the Technical Term: Name the hormones which lead to the following condition: Growth of beard in women

Write the functional activity of the following structure:
Chiasmata

Name the following:
The canal through which the testes descend into the scrotum just before birth in human malechild.