Page 1 - 3- Home Assignment I (Obj & Subj)- Bio- geo chemical cycles-2

SAI International School
Subject- Biology
Chapter- Natural Resources
Subtopic- Bio- geo chemical cycles-2
Module- 35
Home Assignment – I

Objective (MCQ)

1. Which of the following represents the correct formula of ozone?
(a) OZn
(b) O2Zn
(c) O3Zn
(d) O3
2. Which of the following damages ozone layer?
(a) Chlorine
(b) Fluorine
(c) Hydrogen
(d) CFCs
3. In which form carbon is not stored on earth?
(a) As organic molecule in living organisms.
(b) As carbon dioxide in the atmosphere.
(c) As water molecule
(d) As organic matter in soil.
4 Which one of the following is not a cause of ozone depletion?
(a) Oxides of nitrogen
(b) Oxides of Sulphur
(c) CFCs
(d) None of these
5 Which of the following gets heat up faster by solar radiation?
(a) Water bodies
(b) Land
(c) Both (a) and (b) heats up at the same time.
(d) Either (a) or (b)
6 The atmosphere of the earth is heated by radiations which are mainly:
(a) Radiated by the sun
(b) Re-radiated by land
(c) Re-radiated by water
(d) Re-radiated by land and water
7 What would happen, if all the oxygen present in the environment is converted to
ozone?
(a) We will be protected more.
(b) It will become poisonous and kill living forms.
(c) Ozone is not stable, hence it will be toxic.
(d) It will help harmful sun radiations to reach earth and damage many life forms.
8 What kind of pollution is being caused if a factory releases waste products into a
nearby stream?
(a) Air
(b) Noise
(c) Water
(d) Soil