Soil Science - Study Mode

[#806] Among the following which one is not Beneficial Element?
Correct Answer

(C) I

Explanation

Solution: Among the following Iodine is not a Beneficial element. There are 17 essential elements for the growth and development of plants and iodine is not one of them. However, Iodine influences plant growth and development and can modulate the plant transcriptome. It exerts a beneficial effect on plants, even when used in tiny amounts.

[#807] Earth worm excreta generally having . . . . . . . . % Ca.
Correct Answer

(D) 25%

Explanation

Solution: The excreta of earthworms generally have 25% of calcium. It contains NKP, micronutrients, beneficial soil microbes also plant growth hormones and enzymes. The excreta of the earthworm is known as vermicompost and is the product of the decomposition process using various species of worms. Vermicompost contains water-soluble nutrients and is an excellent, nutrient-rich organic fertilizer and soil conditioner. It is used in gardening and sustainable, organic farming.

[#808] Nutrients which affect growing tips most are Ca and
Correct Answer

(D) B

Explanation

Solution: Nutrients that affect growing tips most are Calcium and Boron. Plants responding to calcium deficiency exhibit discolouration and upward rolling of leaves and ultimately necrosis. Whereas Boron deficiency exhibit minor chlorosis, upward curling, thickening of leaves, distorted meristems and strap-like leaves.

[#809] Plants absorb nutrients mostly through
Correct Answer

(C) Roots

Explanation

Solution: Plants absorb nutrients mostly through Roots . Plants take up essential elements from the soil through their roots. Nutrient uptake in the soil is achieved by cation exchange, where root hairs pump hydrogen ions into the soil through proton pumps. These hydrogen ions displace cations attached to negatively charged soil particles so that the cations are available for uptake by the root.

[#810] Enzyme responsible for breaking down of the N ≡ N
Correct Answer

(A) Nitrogenase

Explanation

Solution: Nitrogenase is the enzyme responsible for breaking down the N ≡ N bonds. It is the enzyme produced by cyanobacteria and rhizobacteria and is responsible for the reduction of nitrogen to ammonia. Nitrogenases are the only family of enzymes known to catalyze this reaction, which is the key step in the process of nitrogen fixation.