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
To percolate 200 mL of water time taken is 20 minute. The rate of percolation is
  • A
    20 mL/min
  • B
    15 mL/min
  • C
    5 mL/min
  • D
    10 mL/min
    Correct
2
On hot summer days, simmering occurs due to
  • A
    Moisture present in the soil
  • B
    Reflection of light by soil
  • C
    Vapour coming out of the soil
    Correct
  • D
    Heat reflected by the soil
3
Partially decomposed vegetative matter present in the soil is called
  • A
    Oxides
  • B
    Pied
  • C
    Horizon
  • D
    Humus
    Correct
4
The term ______________ describes all forms of minerals matter that are suitable for transformation into soil.
  • A
    Bedrock
    Correct
  • B
    Weathered rock
  • C
    Parental materials
  • D
    Regolith
5
Red and yellow soils generally are created by the presence of
  • A
    Magnesium
  • B
    Iron oxides
    Correct
  • C
    Calcium
  • D
    Organic oxides
6
Crop rotation is practiced to
  • A
    Increase humus
  • B
    Prevent soil erosion
  • C
    Reduce soil pollution
  • D
    Maintain soil fertility
    Correct
7
Dark brown or black colour soil often indicates
  • A
    Large amount of humus
    Correct
  • B
    The presence of iron oxide
  • C
    A very young soil
  • D
    Considerable moisture
8
Best suited soil for lenticels and other pulses is
  • A
    Black soil
  • B
    Sandy soil
  • C
    Loamy soil
    Correct
  • D
    Clayey soil
9
The relative proportion of sand, silt and clay in a soil refers to its
  • A
    Horizon
  • B
    Profile
  • C
    Structure
  • D
    Texture
    Correct
10
The finest of all soil particles are called
  • A
    Clays
    Correct
  • B
    Colloids
  • C
    Primary minerals
  • D
    Silts
11
Which kind of soil is most suitable for planting rice?
  • A
    Soil having earthworms
  • B
    Soil with lower rate of percolation
    Correct
  • C
    Soil with sand particles
  • D
    Soil with higher rate of percolation
12
Rate of soil erosion is faster in area with less plants because
  • A
    Plants are living place of other creatures
  • B
    Root are deeply penetrated
  • C
    Plants make the soil fertile
  • D
    Root holds the soil firmly
    Correct
13
Colloids are important to soil formation because
  • A
    They allow for easy transport of water
    Correct
  • B
    They attract base ions which act as nutrients for plants
  • C
    They allow for breaks in soil for water and gas
  • D
    They attract acidic compounds
14
The most important bases present in the soil are
  • A
    Hydrogen and aluminium
  • B
    Calcium, magnesium, potassium and sodium
  • C
    Calcium, carbon and oxygen
  • D
    Iron oxide and aluminium oxide
    Correct
15
What types of soil may lack peds?
  • A
    Soil with a high sand content
    Correct
  • B
    Soil with high clay contents
  • C
    Iron oxide soils
  • D
    Organic soil