Nervous System — Biology STD 10 — Question

Which Gas is present in large amount in the upper part of stratosphere.

Differentiate between:
Excretion and Secretion.

A free living bacteria which helps in nitrogen fixation.

State the Location: Cell plate

Give Reasons: Medical discoveries such as antibiotics and vaccinations have indirectly contributed to the sharp rise in human population in the present century.

Name the Following :
The scientific name of the plant which Mendel used for his experiments on inheritance?

Name the Following :
Hormone which causes partial closure of stomata.

State the Function: W.B.C.

Explain the Term: Pollution

Name an insecticide?