Given below is the diagram of a human heart. Read the information below the diagram and fill in the
blanks:
The human heart pumps blood throughout the body. It is the size of a large fist. The heart is located between the lungs
in the thoracic cavity. It has four chambers. The heart functions all through the lifespan of a person and is responsible
for the survival of the person.
The heart is enclosed by a membrane called

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.