Plant Pathology - Study Mode

[#666] Yellow leaf mosaic of bhindi crop spreads
Correct Answer

(C) Jassid and borers

Explanation

Solution: Yellow leaf mosaic of bhindi crop spreads Jassid and borers. This disease is caused by a complex consisting of the monopartite begomovirus Bhendi yellow vein mosaic virus and a small satellite DNA beta component. BYVMV can systemically infect bhendi upon agroinoculation but produces only mild leaf curling in this host. Comparative transmission of Bhendi yellow vein mosaic virus by two cryptic species of the whitefly, Bemisia tabaci.

[#667] Food is transported to different parts of plant through
Correct Answer

(B) Phloem

Explanation

Solution: Food is transported to different parts of plant through Phloem. Phloem is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and is known as photosynthates, in particular the sugar sucrose, to the rest of the plant. The phloem is composed of still-living cells that transport sap. The sap is a water-based solution, but rich in sugars made by photosynthesis. Phloem tissue consists of conducting cells, generally called sieve elements, parenchyma cells, including both specialized companion cells or albuminous cells and unspecialized cells and supportive cells, such as fibres and sclereids.

[#668] Photosystem II occurs in
Correct Answer

(C) Grana

Explanation

Solution: Photosystem II occurs in Grana. Photosystem II is the first protein complex in the light-dependent reactions of oxygenic photosynthesis. It is located in the grana of thylakoid membrane of plants, algae, and cyanobacteria. The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen. Photosystem II (of cyanobacteria and green plants) is composed of around 20 subunits (depending on the organism) as well as another accessory, light-harvesting proteins.

[#669] The basic slag is
Correct Answer

(B) Citrate soluble fertilisers

Explanation

Solution: The basic slag is Citrate soluble fertilizers. Basic slag is a dark powder that is insoluble in water and does not cake. It contains not less than 14 percent P 2 O 5 in citrate-soluble form. Basic slag is most suitable for use on acid soils as a base fertilizer. Basic slag is a by-product of the steel industry. In the steelmaking process the impurities in the crude iron are oxidized and together with lime form the slag. This slag which contains the phosphorus in the form of silicophosphates is ground to a fine powder.

[#670] Stomata of CAM plants
Correct Answer

(C) Open during night and close during day

Explanation

Solution: Stomata of CAM plants open during night and close during day. CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions that allows a plant to photosynthesize during the day, but only exchange gases at night. In a plant using full CAM, the stomata in the leaves remain shut during the day to reduce evapotranspiration, but they open at night to collect carbon dioxide (CO 2 ) and allow it to diffuse into the mesophyll cells. Stomata in CAM plants open during the dark period and close during light period. Behavior of stomata in CAM plants is part of an adaptive mechanism evolved by plants that grow in hot and dry environments to conserve water.