Cell Cycle, Cell Division and Structure of Chrmosomes — Biology STD 10 — Question

Give Reasons for the Following:
It is necessary to maintain a normal osmotic concentration of blood

Rearrange the following in correct sequence pertaining to what is given within bracket at the end.
repolarization……. Depolarization…….. Resting….. (polarised) (during conduction of nerve impulse through a nerve fibre)

Name the Following :
Name the muscles which make up the wall of the heart.

Give Technical Terms
The stage in mitosis when the nucleolus starts disappearing.

Name the following:
Cells having a single set of chromosomes.

Name the following:

The photoreceptors found in the retina of the eye.

Name the instrument used for measuring the rate of transpiration.

Name the Following
The organ which produces urea.

Give Reason:

The spinal cord and brain are called the central nervous system.

Define the following:
Hormone