Genetics And Plant Breeding - Study Mode
[#181] Photophosphorylation is a process in which?
Correct Answer
(D) Light energy is converted into chemical energy in the form of ATP
Explanation
Solution: Photophosphorylation is a process in which Light energy is converted into chemical energy in the form of ATP. It is the conversion of ADP to ATP using the energy of sunlight by activation of PSII. This involves the splitting of the water molecule into oxygen and hydrogen protons (H + ), a process known as photolysis. Cyclic photophosphorylation occurs in both aerobic and anaerobic conditions, driven by the main primary source of energy available to living organisms, which is sunlight.
[#182] The dominance hypothesis of heterosis was first proposed by
Correct Answer
(A) Davenport (1908)
Explanation
Solution: The dominance hypothesis of heterosis was first proposed by Davenport (1908). The dominance hypothesis attributes heterosis to canceling of deleterious or inferior recessive alleles contributed by one parent, by beneficial or superior dominant alleles contributed by the other parent in the heterozygous genotypes at different loci. It was proposed by Charles Davenport in 1908 and is the most widely accepted hypothesis among the explanation of heterosis.
[#183] Exons help in synthesis of
Correct Answer
(A) Protein
Explanation
Solution: Exons help in the synthesis of Protein. Exons contain information that directly results in the final order of amino acids within the protein. Interspersed between exons are introns which are removed during protein synthesis in a process known as splicing. Changes in the exon sequence can result in changes to the amino acid sequence and resulting protein.
[#184] Interveinal necrosis in lemon leaves is caused by the deficiency of
Correct Answer
(C) Zinc
Explanation
Solution: Interveinal necrosis in lemon leaves is caused by the deficiency of Zinc. Interveinal Chlorosis is a yellowing of the tissue between the veins of a leaf due to the decline of chlorophyll production and activity. Zinc deficiency affects citrus growing in either acid or alkaline soils but is usually more severe with alkaline soils. Excessive use of phosphate fertilizers can accentuate zinc deficiency.
[#185] Amount of pollen grains per each kernel produced by a maize tassel is at least
Correct Answer
(D) 25000
Explanation
Solution: The amount of pollen grains per kernel produced by a maize tassel is at least 25000. Tassels are relatively large inflorescences and produce many flowers. Estimates of pollen grain production range from 2 to 25 million pollen grains per tassel. 97% or more of the kernels produced by each plant are pollinated by other plants in the field. Each tassel contains as many as 2 million or more pollen grains, which translates to at least 2,000 pollen grains produced for each silk of the ear shoot.