Soil Science - Study Mode
[#711] Intracellular deposits of which element is known as plant opals
Correct Answer
(B) Silicon
Explanation
Solution: Intracellular deposits of Silicon element is known as Plant opals . Plant opals are microscopic amorphous siliceous bodies that occur in living plants. It can also be called a plant-derived silica body excavated from the soil. These are commonly found in plants in the leaf epidermis and outermost covering of seeds and fruits, the epidermis of bracts that surround and protect grass seeds and in the sub-epidermal tissue of orchid and palm leaves.
[#712] 'Annals of Agriculture' a book was written by
Correct Answer
(B) Arthur Young
Explanation
Solution: 'Annals of Agriculture' a book was written by Arthur Young . It is the official journal of the faculty of agriculture. It aims to maximize the quality of the agricultural sector across the globe with an emphasis on the Arabian countries by focusing on publishing high-quality applicable research, in addition to the new methods and frontiers leading to maximizing the quality and quantity of both plant and animal yield and final products.
[#713] Which plant nutrient move from soil to the roots by root interaction, mass flow and diffusion in equal proportion
Correct Answer
(A) Zinc
Explanation
Solution: Zinc is the plant nutrient that moves from the soil to the roots by root interaction, mass flow, and diffusion in equal proportion. Zinc is not mobile in the soil. It tends to stay where it has been placed. Crop-up take is therefore reliant on the plant roots growing intercepting the applied zinc rather than zinc moving in the soil solution to the roots. In some cases, roots may induce zinc deficiency.
[#714] Carbonic Anhydrase, Superoxide dismutase enzyme activity is related with which element?
Correct Answer
(A) Zn
Explanation
Solution: Carbonic Anhydrase and superoxide dismutase enzyme activity are related to the Zinc element. Zinc activates enzymes of protein metabolism, and is a part of carbonate dehydratase, and superoxide dismutase. The zinc ion creates the catalytic center in Superoxide dismutase. Carbonate dehydratases form a family of enzymes that catalyzes the interconversion between carbon dioxide and water and dissociated ions of carbonic acid. The active site of most carbonic anhydrases contains a zinc ion.
[#715] Legumes fail to develop nodule as soil having pH of
Correct Answer
(B) < 5
Explanation
Solution: Legumes fail to develop nodules as the soil has a pH of < 5. Legumes can form a symbiotic relationship with nitrogen-fixing soil bacteria called rhizobia. At low pH (<5), dry matter production, seed yield and nitrogen fixation were significantly lower than at higher pH levels. Low pH delayed the development of nitrogenase activity.