Soil Science - Study Mode

[#691] One acre of soil to a depth of 6 inch weight about
Correct Answer

(C) 2 × 10 6 Ib

Explanation

Solution: One acre of soil to a depth of 6 inches weighs about 2 million pounds or 2 × 10 6 Ib. One acre of soil up to 15 cms or 6 inches would be 8,96,000 kgs.

[#692] In neutron moisture meter, source of fast neutrons is/are
Correct Answer

(C) Both A and B

Explanation

Solution: A neutron moisture meter is a moisture meter utilizing neutron scattering. It is used to measure the water content in soil or rock. The technique is non-destructive and is sensitive to moisture in the bulk of the target material. In the neutron moisture meter, the source of fast neutrons is both Radium and American-beryllium.

[#693] The ionic strength of 0.05 M CaCl 2 solution will be
Correct Answer

(B) 0.15

Explanation

Solution: CaCl 2 solution has 2 ions of chlorine. Stoichiometric factor 2 of Cl - Based on the equation, a 0.05 M CaCl 2 solution has an ionic strength of I = 3 × 0.05 M = 0.15 M

[#694] Which organism is indicator of S-pollution?
Correct Answer

(C) Lichen

Explanation

Solution: S-pollution is Sulphur dioxide pollution, and Lichens is an indicators of S-pollution. Lichens do not survive in areas polluted with Sulphur dioxide. Sulphur dioxide is a gaseous air pollutant composed of Sulphur and oxygen, formed by burning coal, oil, or diesel is burned. And this Sulphur dioxide combines with rain water and air to form sulphuric acid, which is the main component of acid rain.

[#695] Which of the following small grain crops has an exceptional tolerance to law leaves of soil copper supply?
Correct Answer

(A) Barley

Explanation

Solution: Barley is a small grain crop that has exceptional tolerance to law leaves of soil copper supply. Ears of copper deficient plants are often trapped in the sheath and emerge with white tips and blind spikelets plants show dry, white and twisted tips. Young leaves wilt on their tips whereas the basal leaves remain dark green.