Page 1 - 3- Home Assignment I (Obj & Subj)-Mineral riches in the soil

SAI International School
Subject- Biology
Chapter- Natural Resources
Subtopic- Mineral riches in the soil
Module- 33
Home Assignment – I

Objective (MCQ)

1. Top soil is the best for the vegetation. The main components of this productive top
layer are:
(a) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms and plants
(d) Humus, living organisms and soil particles
2. One of the following factors does not lead to soil formation in nature
(a) the sun
(b) water
(c) wind
(d) polythene bags
3. Top-soil contains the following
(a) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms and plants
(d) Humus, living organisms and soil particles.
4 Major source of mineral in soil is the
(a) parent rock from which soil is formed
(b) plants
(c) animals
(d) bacteria
5 Growth of Lichens on barren rocks is followed by the growth of
(a) moss
(b) ferns
(c) gymnosperms
(d) algae
6 Soil erosion can be prevented by
(a) raising forests
(b) deforestation
(c) excessive use of fertilizer
(d) overgrazing by animals
7 What happens when rain falls on soil without vegetational cover?
(a) Rainwater percolates in soil efficiently
(b) Rainwater causes loss of surface soil
(c) Rainwater leads to fertility of the soil
(d) Rainwater does not cause any change in soil
8 Breaking of bigger rocks into fine smaller mineral particles is called:
(a) Paedogenesis
(b) Mineralization
(c) Cracking
(d) Weathering
9 A pencil lead is made up of this mineral.
(a) Graphite