Cell Division — Biology STD 10 — Question

Meiotic division is also called ______ division.

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 ___________.

The ____________ have thin and less muscular . ____________ and have ____________ to prevent the back flow of blood.

The chamber of heart which pumps blood into aorta is __________.

The pressure by which the________________ molecules tend to cross the semipermeable membrane is called osmotic pressure.

Study the diagram given below and fill in the blanks with suitable words::


In order to prove that carbon dioxide is necessary for (a) ___________, a potted plant is placed in dark for 48 hours to (b) ___________,the leaves. A part of a leaf is inserted into a conical flask containing potassium hydroxide solution. This is to absorb (c) ___________,from the flask. The plant is then placed in sunlight for a few hours. The experimental leaf is tested for starch. The part of the leaf that was inside the conical flask turns (d) ___________,whereas the part of the left outside turns (e) ___________,in colour.

Plants become cool as a result of _____________

Sewage is a liquid waste from __________.

To test a leaf for starch, the leaf is boiled in water to (i) ___________ . It is then boiled in Methylated spirit to (ii)___________ The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (iii) ___________ solution is added. The region of the leaf which contains starch, turns (iv) ___________ and the region which does not contain starch, turns (v) ___________