Plant Pathology - Study Mode
[#366] Main substance involved in transfer of electrons in photosynthesis is
Correct Answer
(B) Cytochrome
Explanation
Solution: Main substance involved in transfer of electrons in photosynthesis is Cytochrome. In photosynthesis, the cytochrome complex functions to mediate the transfer of electrons and energy between the two photosynthetic reaction center complexes, Photosystem II and Photosystem I, while transferring protons from the chloroplast stroma across the thylakoid membrane into the lumen. Cytochrome c4 functions as a physiological electron carrier in the photosynthetic electron transport chain in R. gelatinosus.
[#367] Burgundy mixture contains sodium carbonate in place of CaCO 3 as in Bordeaux mixture was discovered in
Correct Answer
(B) 1887
Explanation
Solution: Burgundy mixture contains sodium carbonate in place of CaCO 3 as in Bordeaux mixture was discovered in 1887. Bordeaux mixture contains copper(II) sulfate, CuSO 4 , and hydrated lime, Ca(OH) 2 , while Burgundy mixture contains copper sulphate, CuSO 4 , and sodium carbonate, Na 2 CO 3 . Burgundy mixture, named after the French district where it was first used to treat grapes and vines, is a mixture of copper sulfate and sodium carbonate. This mixture, which can have an overall copper concentration within the range of 1% to 20%, is used as a fungicidal spray for trees and small fruits.
[#368] Quantasomes occur on the surface of
Correct Answer
(B) Plasmalemma
Explanation
Solution: Quantasomes occur on the surface of Plasmalemma. Quantasomes were first identified by Roderic B. Park in 1962. Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts. They are composed of lipids and proteins that include various photosynthetic pigments and redox carriers.
[#369] Causal agent of Ring spot of potato is
Correct Answer
(C) Clavibacter michiganensis
Explanation
Solution: The causal agent of Ring spot of potato is Clavibacter michiganensis. Ring spot causes vascular wilt in the above ground parts of the potato plant, with discolouration and loss of texture/consistency noted in infected tubers. It leads to Losses of up to 50% of the crop have been noted in severe infections.
[#370] Nitrogen loss from urea application in paddy field is known as
Correct Answer
(A) Denitrification
Explanation
Solution: Nitrogen loss from urea application in paddy fields is known as Denitrification. Denitrification in paddy soils is an environmentally important reaction, which reduces leaching or emission of nitrogen pollutants. It is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere.