Plant Pathology - Study Mode

[#411] The formula for chlorophyll a is
Correct Answer

(C) C 55 H 72 O 5 N 4 Mg

Explanation

Solution: The formula for chlorophyll a is C 55 H 72 O 5 N 4 Mg. Chlorophyll is any of several related green pigments found in cyanobacteria and the chloroplasts of algae and plants. Chlorophyll allows plants to absorb energy from light. All are defined as derivatives of the parent chlorin by the presence of a fifth, ketone-containing ring beyond the four pyrrole-like rings. The only difference between chlorophyll a and chlorophyll b is that the former has a methyl group whereas the latter has a formyl group. This difference causes a considerable difference in the absorption spectrum, allowing plants to absorb a greater portion of visible light.

[#412] Dispersal of spores by human is known as
Correct Answer

(C) Anthropochory

Explanation

Solution: Dispersal of spores by a human is known as Anthropochory. The dispersal of seeds, spores, or other reproductive botanical material, or reproductively capable animals, by humans as a routine means of reproductive dispersal of that species. Human dispersers differ from animal dispersers by having much higher mobility, based on the technical means of human transport. Humans may disperse seeds by many various means and some surprisingly high distances have been repeatedly measured.

[#413] ATP is injected in cyanide poisoning because it is
Correct Answer

(A) Necessary for cellular functions

Explanation

Solution: ATP is injected in cyanide poisoning because it is necessary for cellular functions. Plants have an alternative electron transfer pathway available that passes electrons directly from ubiquinone to O 2 , which confers cyanide resistance by bypassing COX. ATP is the power currency of a cell and it is injected in cyanide poisoning as it breaks down cyanide, necessary for the proper functioning of the cell.

[#414] Constituents of pigment system I are located on
Correct Answer

(C) Outer surface of granal and stromal thylakoids

Explanation

Solution: Constituents of pigment system I are located on the outer surface of granal and stromal thylakoids. Photosynthetic pigments are the molecules responsible for absorbing electromagnetic radiation, transferring the energy of the absorbed photons to the reaction center, and for photochemical conversion in the photosynthetic systems of organisms capable of photosynthesis. The pigment system I (PSI) complex consists of 200 chlorophylls, 50 carotenoids and a molecule of chlorophyll an absorbs light at 700 nm (P700) and this constitutes the reaction center of photosystem I.

[#415] Phytoplasma was 1 st observed in
Correct Answer

(B) Mulberry dwarf

Explanation

Solution: Phytoplasma was 1 st observed in Mulberry dwarf. Phytoplasmas were discovered in 1967 by Japanese scientists who termed them mycoplasma-like organisms. Phytoplasmas can be found as far back as 1603 in mulberry dwarf disease in Japan. Such diseases were originally thought to be caused by viruses, which, like phytoplasmas, require insect vectors, and cannot be cultured.