Q. Give scientific reason : Astronauts on the moon can not hear each other directly

Q. What is the site of gaseous exchange in an insect?

Q. What facilities are provided to farm animals?

Q. Name the protozoan which causes malaria.

Q. What are the problems of the functioning of ration shops?

Q. Define biofertilizers. Give two types of fungal biofertilizers.

Q. List any four characteristics of an ideal contraceptive.

Q. How many types of fertilization are there? What are they?

Q. Name the enzyme which is used as a ‘ clot buster’ to remove blood clots within blood vessels.

Q. .Cheese is a colloidal solution of .