Plant Pathology - Study Mode

[#896] The causal organism of bunt of rice is
Correct Answer

(C) Neovossia horrida

Explanation

Solution: The causal organism of the bunt of rice is Neovossia horrida. T. horrida has had a chaotic taxonomic history. It has been reclassified within Neovossia. Tilletia horrida, rice kernel smut, caryopsis smut, black smut, or grain smut, is a fungal rice disease believed to only affect the Oryza genus. It presents as a bunt disease in rice.

[#897] Photosynthesis is
Correct Answer

(D) Reduction process

Explanation

Solution: Photosynthesis is a Reduction process. Photosynthesis is a process of reduction of carbon dioxide to carbohydrates, cellular respiration is the oxidation of carbohydrates or other nutrients to carbon dioxide. During photosynthesis, plants take in carbon dioxide (CO 2 ) and water (H 2 O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.

[#898] India's rank in fertilisers consumption in the world is
Correct Answer

(D) 3

Explanation

Solution: India's rank in fertilizers consumption in the world is 3. The main products offered by the fertilizer sector in India include nitrogenous fertilizers, complex fertilizers and phosphate-based fertilizers. Indian fertilizer industry ranks 3 rd in world production. Consumption of fertilizers in India as per the 2019 census, is 29.37 million metric tons of nutrients.

[#899] In plants water moves from
Correct Answer

(A) Less nagative to more nagative gradient

Explanation

Solution: In plants, water moves from a less negative to a more negative gradient. Plants release water vapour into the atmosphere, which creates a negative pressure in the xylem, the layer of small vessels that brings water up from the root. If a plant has enough water, it opens its stoma, the pores under its leaves, to pull in carbon dioxide, which it photosynthesizes into sugar to fuel growth. The root hair cells have carrier molecules on their cell membranes. These pick up the mineral ions and move them across the membrane into the cell against the concentration gradient.

[#900] Gypsum contains
Correct Answer

(B) 29.2% Ca and 18.6% S

Explanation

Solution: Gypsum contains 29.2% Ca and 18.6% S. Gypsum is a soft sulphate mineral composed of calcium sulphate dehydrate, with the chemical formula CaSO 4 ยท2H 2 O. Gypsum provides two of the secondary plant macronutrients, calcium and sulphur. Gypsum is also formed as a by-product of sulphide oxidation, amongst others by pyrite oxidation, when the sulfuric acid generated reacts with calcium carbonate. Its presence indicates oxidizing conditions.