The soil near the surface is usually darker than about one meter down, this is because the top soil:
Contains more organic matter
Is richer in calcium and magnesium
Is wetter than the sub-soil
Is drier than the sub-soil
A
Is wetter than the sub-soil
B
Is drier than the sub-soil
C
Is richer in calcium and magnesium
D
Contains more organic matter
Open in App
Solution
Verified by Toppr
The uppermost layer of soil is usually darker in colour due to the presence of huge amount of organic matter. Organic matter is composed of roots, dead leaves, insects, small organisms and animals which eventually get degraded to form humus and make the soil fertile. Humus is black in colour due to the large quantity of carbon.
So, the correct option is 'B'.
Was this answer helpful?
0
Similar Questions
Q1
The soil near the surface is usually darker than about one meter down, this is because the top soil:
View Solution
Q2
The soil near the surface is usually darker, than the soil about one meter down. This is because the topsoil is
View Solution
Q3
The transfer of minerals from top soil to sub soil through soil water is called
View Solution
Q4
Following are the misconceptions about root hydrotropism. State whether they are correct or not. i. The greater growth of roots in moist soil zones than in dry soil zones is not usually a result of hydrotropism. Hydrotropism requires a root to bend from a drier to a wetter soil zone. Roots require water to grow so roots that happen to be in moist soil will grow and branch much more than those in dry soil. ii. Roots cannot sense water inside intact pipes via hydrotropism and break the pipes to obtain the water. iii. Roots cannot sense water several feet away via hydrotropism and grow toward it. At best hydrotropism probably operates over distances of a couple millimeters.