Soil Science - Study Mode

[#566] Which one of the following occupies the highest volume percent in a fine sandy loam surface soil in good condition for plant growth?
Correct Answer

(B) Pore space which includes air and/or water

Explanation

Solution: Pore space which includes air or water occupies the highest volume percent in a fine sandy loam surface soil in good condition for plant growth. Pore space in the soil makes it more porous and good in texture, allowing roots to respire in the soil.

[#567] Which kind of Soil having high Soil consistency?
Correct Answer

(B) Dry soil

Explanation

Solution: Dry soil is soil having high soil consistency. Soil consistency is the strength with which soil materials are held together or the resistance of soils to deformation and rupture. Soil consistency is measured for wet, moist and dry soil samples. The rating of soil consistency helps in describing a soil profile and is also used for estimating suitability for traffic and tillage.

[#568] Reduction reaction (NO 2 to NH 3 ) for nitrate assimilation by enzyme nitrite reductase takes place in
Correct Answer

(C) Chloroplast

Explanation

Solution: Reduction reaction (NO 2 to NH 3 ) for nitrate assimilation by enzyme nitrite reductase takes place in Chloroplast . In photosynthetic eukaryotes, nitrate assimilation is performed by two transport and two reduction steps: the first nitrate is transported into the cell, then a cytosolic Nitrate reductase (NR) catalyzes nitrate reduction nitrite, which subsequently is transported into the chloroplast, where the enzyme Nitrite reductase catalyzes its reduction to ammonium.

[#569] Which one of the following water potential in soil is always positive
Correct Answer

(C) Gravitational potential

Explanation

Solution: Gravitational potential is the water potential in the soil is always positive . The gravitational potential is that portion of the total water potential that is due to the gravitational force field of the earth and is dependent on the vertical location of the water relative to the reference level. The gravitational potential of soil water at each point is determined by the elevation of the point relative to some arbitrary reference level.

[#570] The optimum fertiliser dose is one which maximises
Correct Answer

(C) Profits

Explanation

Solution: The optimum fertilizer dose maximizes profits. Fertilizers are substances of natural or synthetic origin supplied to the crops to increase their productivity. Fertilizers enhance the growth of plants and fertilizers act to enhance the effectiveness of the soil by modifying its water retention and aeration.