Pollution — Biology STD 10 — Question

____________ species concept is currently the most popular among most biologists.

Complete the following sentence with appropriate words:

Sweat formed in the sweat glands passes into the sweat duct which opens to the outside at the surface of the skin by means of ______.

The expulsion of the fetus from the body to the mother in a human female is called __________.

Calvin cycle was proposed by __________.

The element required for blood clotting is __________.

DNA stands are made up of, pentose sugar and four types of ______ bases.

The average heart rate is ____________ beats per minute in human being.

The activities of the thyroid gland are controlled by. ____________ secreted by the ____________ gland.

Given below are hypothetical figures in regard to population (in crores) of two countries A and B during the last three decades.

Country	1971	1981	1991
A	6.4	9.6	10.6
B	15.7	15.7	15.3

Fill in the blanks:
The country __________ shows negative population growth between years __________ and ___________.

In humans, sex is completely determined by the ________ (i)_______ not depend on the ________ (ii) ________ . Typically, a female has two ________ (iii) ________ chromosomes, while a male has one ________ (iv) ________ and one ________ (v) ________ chromosome.