Photosynthesis — Biology STD 10 — Question

Carbon dioxide enters the leaf through _______.

Hydathodes: ______

The secondary growth of the stem and the differentiation of the xylem and phloem tissues are mainly controlled by _____________ .

Chloroplasts ______.

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.

Too much light destroys chlorophyll.

Non-coagulation of blood is called ___________.

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 __________.