Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following are not among the ideal soil conditions for growing crops?

a. extremely large air spaces

b. sandy or silty loam

c. blend of sand and clay

d. less than 5% humus

e. thick topsoil

Summary Introduction


Soil is a blend of minerals, gases, organic matter, liquids, and microbes that support life altogether. One of the crucial functions of soil is to act like a growth medium for plants. Soil fixes the root of the plant and is the chief source of water and inorganic compounds that is required by plants. Soil is formed due to the weathering of rock and various inorganic particles present in the earth's crust.


Justification/explanation for the correct answer:

Option (a) states that “extremely large air spaces” is not an ideal soil condition for growing crops. In a soil having large and round particles, extra space is present for water and air that is required by crops. Also, air space between the soil particles is larger that offers superior aeration. But, in sandy soil, most of these spaces are extremely large to hold water against the gravitational force, thereby creating a soil with little water-holding ability that makes it more prone to drought. Hence, option (a) is correct.

The explanation for the incorrect answer:

Option (b) states that “sandy or silty loam” is the ideal soil conditions for growing crops. Good soil for agriculture should be sandy or silty loam that includes a mixture of humus, fine, and coarse particles, which provides sufficient aeration and holds enough water for plants to grow properly. So, it is an incorrect option.

Option (c) states that “blend of sand and clay” is the ideal soil conditions for growing crops...

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