Soil Science - Study Mode

[#656] The micronutrient needed in smallest amount
Correct Answer

(D) Mo

Explanation

Solution: The micronutrient needed in the smallest amount by the plant is Molybdenum . Molybdenum is an essential component in two enzymes that convert nitrate into nitrite and then into ammonia before it is used to synthesize amino acids within the plant. It is also required by symbiotic nitrogen fixing bacteria in legumes to fix atmospheric nitrogen. The normal range for most plant tissue is between 0.3 - 1.5 ppm.

[#657] Which primary mineral having huge importance in terms of plant nutrition?
Correct Answer

(D) Amphibole

Explanation

Solution: Amphibole is a primary mineral having huge importance in terms of plant nutrition. It is a group of inosilicate minerals, form prism or needle-like crystals. Amphiboles are the primary constituent of amphibolites. It is a major group of hydrous minerals that occurs in a wide range of rock types.

[#658] X-ray diffraction analysis follows which principle
Correct Answer

(B) Bragg's law

Explanation

Solution: X-ray diffraction analysis is based on Bragg’s law , which states that "when the X-ray is incident onto a crystal surface, its angle of incidence θ, will reflect with the same angle of scattering θ. It encompasses the superposition of wavefronts scattered by lattice planes, leading to a strict relation between wavelength and scattering angle, or else to the wave vector transfer concerning the crystal lattice.

[#659] The C : N ratio in humus is
Correct Answer

(A) 10 : 1

Explanation

Solution: Humus is the dark organic matter in soil that is formed by the decomposition of plant and animal matter. It is a soil organic matter rich in nutrients and retains moisture in the soil. The carbon and nitrogen ratio of humus is about 10 : 1. The carbon to nitrogen ratio is significant in composting because microorganisms need a good balance of carbon and nitrogen to remain active.

[#660] Which part of cotton plant is used for tissue test
Correct Answer

(B) The youngest fully mature leaves of the main stem

Explanation

Solution: The youngest fully mature leaves of the main stem are used for tissue tests in the cotton plant because these are the growing cells and show the accurate status of nutrients in the plant. Tissue analysis shows if the crop is taking up the nutrients from the soil or through the tissue from a foliar application.