Class 7 Soil CBSE Questions & Answers

Class 7 · Soil

This is Science Class 7 Soil CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Humus makes the soil
  • A
    Red and infertile
  • B
    Infertile and provide water
  • C
    Soft and impermeable
  • D
    Fertile and provide nutrients
    Correct
2
From which elements are clay elements are formed?
  • A
    Sodium and potassium
  • B
    Hydrogen and oxygen
  • C
    Calcium aluminium
  • D
    Aluminium and silicon
    Correct
3
How many essential elements are required for normal growth of green plants?
  • A
    56
  • B
    6
  • C
    16
    Correct
  • D
    19
4
Which type of soil is well aerated
  • A
    Clayey soil
  • B
    Loamy soil
  • C
    Sandy soil
    Correct
  • D
    Red soil
5
Why are cations attracted by clay minerals?
  • A
    Because no other minerals bound with cations
  • B
    Because of electrostatic attraction
    Correct
  • C
    Because clay minerals are largest particle
  • D
    Because of temperature gradient
6
Why is it important to apply nitrogen fertilisers at an appropriate time of the year?
  • A
    Fertiliser is more expensive in particular time
  • B
    During winter, nitrate more easily leached in soil.
    Correct
  • C
    Fertiliser require a threshold level of soil water
  • D
    Fertilisers works only above 10 degree temperature
7
C-horizon of soil profile consists of
  • A
    Small lumps of rock with cracks and crevices
    Correct
  • B
    Large lumps of rocks with cracks and crevices
  • C
    Fine particles with humus
  • D
    Mixture of fine particles and gravels
8
------------- is hard and difficult to dig with a spade.
  • A
    Top soil
  • B
    Bed rock
    Correct
  • C
    Alluvial soil
  • D
    Desert soil
9
In which of the following climates weathering takes most rapid?
  • A
    Hot and humid
    Correct
  • B
    Hot and dry
  • C
    Cold and dry
  • D
    Cold and humid
10
Humus: decomposition of organic matter:: soil : ?
  • A
    Leaching
  • B
    Fermentation
  • C
    Weathering
    Correct
  • D
    Salination
11
Soil can be classified as
  • A
    Sandy, Mountain and Loamy
  • B
    Sandy, Clayey and Loamy
    Correct
  • C
    Delta, Clayey and Loamy
  • D
    Sandy, Clayey and Desert
12
Uppermost layer of soil profile is
  • A
    A-horizon
    Correct
  • B
    B-horizon
  • C
    O-horizon
  • D
    C-horizon
13
Percolation rate is the
  • A
    Volume of water absorbed by soil
  • B
    Water holding capacity of the soil
  • C
    Rate of evaporation from the soil
  • D
    Volume of water passing through soil per unit time
    Correct
14
Which soil is made from basaltic rock?
  • A
    Red soil
  • B
    Alluvial soil
  • C
    Desert soil
  • D
    Black soil
    Correct
15
Removal and transport of soil by water and wind is called
  • A
    Soil termination
  • B
    Soil erosion
    Correct
  • C
    Weathering
  • D
    Soil pollution