NCERT Solutions for Class 7th Science
Chapter 9 – SOIL
(Complete Downloadable Chapter Solution PDF file is at the bottom of the page)
Tick the most suitable answer in questions 1 and 2.
Q.1 In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants
Ans (iii) minerals, organic matter, air and water
Q.2 The water holding capacity is the highest in
(i) sandy soil
(ii) clayey soil
(iii) loamy soil
(iv) mixture of sand and loam
Ans (ii) clayey soil
Q.3 Match the items in Column I with those in Column II:
Column I Column II
(i) A home for living organisms (a) Large particles
(ii) Upper layer of the soil (b) All kinds of soil
(iii) Sandy soil (c) Dark in colour
(iv) Middle layer of the soil (d) Small particles and packed tight
(v) Clayey soil (e) Lesser amount of humus
Ans (i) A home for living organisms (b) All kinds of soil
(ii) Upper layer of the soil (c) Dark in colour
(iii) Sandy soil (a) Large particles
Q.4 Explain how soil is formed.
Q.5 How is clayey soil useful for crops?
Q.6 List the differences between clayey soil and sandy soil.
Q.7 Sketch the cross section of soil and label the various layers.
Q.8 Razia conducted an experiment in the field related to the rate of percolation. She observed that it took 40 min for 200 mL of water to percolate through the soil sample. Calculate the rate of percolation.
Ans Amount of water percolated = 200 mL
Percolation time = 40 min
As we know that, rate of percolation (mL/min) = amount of water (mL) / Percolation time (min)
Rate of percolation = 200/40
= 5 mL/min
Q.9 Explain how soil pollution and soil erosion could be prevented.
Q.10 Solve the following crossword puzzle with the clues given: