Plant Pathology - Study Mode
[#131] Red drop discovered by Emerson is due to disruption of photochemical activity of
Correct Answer
(C) PS II
Explanation
Solution: Red drop discovered by Emerson is due to disruption of photochemical activity of PS II. The Emerson effect is the increase in the rate of photosynthesis after chloroplasts are exposed to the light of wavelength 680 nm (deep red spectrum) and more than 680 nm (far red spectrum). When simultaneously exposed to light of both wavelengths, the rate of photosynthesis is far higher than the sum of the red light and far red light photosynthesis rates. The effect was early evidence that two photosystems, processing different wavelengths, cooperate in photosynthesis.
[#132] The Karnal bunt of wheat is caused by
Correct Answer
(A) Neovossia indica
Explanation
Solution: The Karnal bunt of wheat is caused by Neovossia indica. Karnal bunt of wheat, caused by Neovossia indica (Mitra) Mundkur, was first reported in 1931 from Northwestern India in experimental plantings, It is a disease of wheat and triticale. The fungus and the plant disease that it causes are harmless to humans and animals. It reduces grain quality through the production of masses of powdery spores that discolour the grain and grain products.
[#133] Cell wall lack microorganism
Correct Answer
(D) MLO
Explanation
Solution: The cell wall lacks microorganism MLO. Mycoplasmas (MLO) are fastidious bacteria that lack a cell wall. They belong to the class Mollicutes and are the smallest known free-living organisms. Many require sterols for growth, and Ureaplasma species require urea for fermentation. Mycoplasmas measure only 0.3 to 0.8 µm in size.
[#134] Fumarase changes fumaric acid into
Correct Answer
(A) Malic acid
Explanation
Solution: Fumarase changes fumaric acid into Malic acid. Living cells make an enzyme called fumarase. It converts a chemical called fumaric acid into L-malic acid. This is a crucial step in primary metabolism and aerobic respiration, the process of using oxygen to release energy for life.
[#135] Citric acid cycle is the alternate name of
Correct Answer
(C) TCA cycle
Explanation
Solution: The citric acid cycle is the alternate name of the TCA cycle. The citric acid cycle (CAC) also known as the Krebs cycle or the TCA cycle (tricarboxylic acid cycle) is a series of chemical reactions to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins. The Krebs cycle is used by organisms that respire to generate energy, either by anaerobic respiration or aerobic respiration.