Pollution — Biology STD 10 — Question

Mitosis occurs in our _______ cells.

The ______ is the layer of the atmosphere that contains the protective ozone layer

The erythrocytes contain an iron-rich pigment called __________.

The number of chromosomes in human is ________ .

Ganong's potometer is designed to measure the rate of water ___________ (i) ___________ by a plant, which indicates the rate of ___________ (ii) ___________ . However, it has limitations, including the inability to measure transpiration under ___________ (iii) ___________ environmental conditions. The rate of transpiration is affected by several factors such as ___________ (iv) ___________, ___________ (v) ___________ , and light intensity, all of which can alter water loss in plants.

___________ chromosomes do not take part in sex determination.

The term Genetics was introduced by ________ in 1906.

Given below is certain structure, write the term for the functional activity.
Blood platelets and …………………………….

Primitive man began existence about ______ million years back.

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 zero population growth between years __________ and __________.