Egrets are often seen along with grazing cattle. How do you refer to this interaction? Give a reason for this association.

How do the atomic radii vary in group and in period ? Give reasons for variation.

An orchid plant Is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree?

"India has greater ecosystem diversity than Norway. "Do you agree with the statement? Give reasons in support of your answer.

Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.

What do you mean by negative interactions between species? Name the type of interactions involved in following examples. Algae and fungus association in lichens.

You have seen weather reports on television ans in newspapers. How do you think that we are to predict the weather?

Do you justify the statutory ban on amniocentesis in our country? Give reasons.