Choose the correct answers to the questions from the given options. [15] (Do not copy the question, write the correct answers only.)
Hari is fond of watching the fish in an aquarium. So, he set up an aquarium in his
house. Along with a number of fresh water fish, he also placed a clown fish which
is a salt water fish. After few hours, the clown fish was found dead and floating on
water. This was due to:

15] Select the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only).
The structure that lies at the junction of the choroid and the iris and is itself a part of the choroid is called:

15] Select the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only).
The optimum temperature for photosynthesis is:

Given below is a picture of a tree. Mention the scientific phenomena occurring in the parts labelled (a),
(b) and (c).
(c)
(b)
(a)

15] Select the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only).
The number of live births per thousand people per year is called:

What are biomedical wastes? Give an example.

State any two harmful effects of acid rain.