Plant Pathology - Study Mode
[#406] Amino acids are mostly synthesised from
Correct Answer
(C) α-ketoglutaric acid
Explanation
Solution: Amino acids are mostly synthesized from α-ketoglutaric acid. α-Ketoglutarate is one of the most important nitrogen transporters in metabolic pathways. The amino groups of amino acids are attached to it (by transamination) and carried to the liver where the urea cycle takes place. α-Ketoglutarate is transaminated, along with glutamine, to form the excitatory neurotransmitter glutamate. Glutamate can then be decarboxylated into the inhibitory neurotransmitter gamma-aminobutyric acid.
[#407] The chemical structure of chlorophyll a varies from chlorophyll b due to difference between
Correct Answer
(B) CH 3 and CHO
Explanation
Solution: The chemical structure of chlorophyll a varies from chlorophyll b due to difference between CH 3 and CHO. Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. Chlorophyll b helps in photosynthesis by absorbing light energy. In chlorophyll a, third carbon of the side group is -CH 3 . In chlorophyll b, side group at the third carbon is -CHO. It is more soluble than chlorophyll a in polar solvents because of its carbonyl group.
[#408] The disease caused by Leptosphaeria sacchari in sugarcane is
Correct Answer
(C) Ring spot
Explanation
Solution: The disease caused by Leptosphaeria sacchari in sugarcane is Ring spot. Leptosphaeria sacchari is a plant pathogenic fungus that causes a disease called ring spot on Saccharum officinarum. The infection occurs on the leaves of lower canopy of the crop and starts as small bronze spots. The spots elongate to become longer, irregular-shaped lesions (2.5 to 5 mm × 10 to 18 mm) with red-brown borders.
[#409] During formation of pollen grains, a microspore mother cell undergoes
Correct Answer
(A) One meiotic division
Explanation
Solution: During the formation of pollen grains, a microspore mother cell undergoes one meiotic division. The development of pollen grains takes place in the anther. Pollen development begins when specialized cells (microsporocytes) differentiate in young anthers. There are generally hundreds or thousands of microsporocytes per anther and each passes through meiosis to produce four haploid microspores.
[#410] The share of urea in the N production pattern is
Correct Answer
(B) 85%
Explanation
Solution: The share of urea in the N production pattern is 85%. While India uses many types of fertilizers, urea accounts for most of the consumption of N and DAP for most of that of P 2 O 5 . Urea accounts for 85 percent of the total consumption of straight N fertilizers.