Soil Science - Study Mode
[#351] The phosphorus content as P is plough layer of one hectare of soil containing 0.1% P 2 O 5 is
Correct Answer
(D) 1500 kg
[#352] Concept of 'Soil Catena' is given by
Correct Answer
(B) Milne
Explanation
Solution: A catena in soil science is a series of distinct but co-evolving soils arrayed down a slope. A mature catena is in equilibrium as the processes of deposition and erosion are in balance. The catena concept originated in central Uganda, by chemist W. S. Martin to describe a hill slope sequence at the Bukalasa station. The term catena was first coined by scientist Geoffrey Milne to describe these soil-topography units.
[#353] Which of the following elements is highly mobile?
Correct Answer
(C) P
Explanation
Solution: Phosphorus (P) is considered a highly mobile element within plants. It moves easily from older tissues to younger tissues where it is needed for growth. This mobility is crucial for various physiological processes, including energy transfer and photosynthesis.
[#354] CAN is not acid forming fertiliser, because it contains
Correct Answer
(C) Calcium
Explanation
Solution: CAN is calcium ammonium nitrate, also known as nitro-limestone or nitrochalk. It is a widely used inorganic fertilizer, accounting for 4% of all nitrogen fertilizers used. It is hygroscopic, and its dissolution in water is endothermic. It accounts for roughly 8% calcium and 21 - 27% nitrogen. It is preferred for use on acidic soil, but it is not acid forming fertilizer as it contains Calcium.
[#355] The enzyme responsible for hydrolysis of urea is
Correct Answer
(B) Urease
Explanation
Solution: The enzyme responsible for the hydrolysis of urea is Urease. It catalyzes the hydrolysis of urea, forming ammonia and carbon dioxide. It is found in numerous bacteria, fungi, algae, plants and some invertebrates and also in soils, as a soil enzyme. They are nickel-containing metalloenzymes of high molecular weight.