Genetics And Plant Breeding - Study Mode
[#226] C-value paradox means
Correct Answer
(B) Genome complexity is independent of genome size
Explanation
Solution: The c-value paradox means Genome complexity is independent of genome size. C-value is the amount, in picograms, of DNA contained within a haploid nucleus or one-half the amount in a diploid somatic cell of a eukaryotic organism. In some cases, the terms C-value and genome size are used interchangeably. However, in polyploids, the C-value may represent two or more genomes contained within the same nucleus. The C-value enigma or C-value paradox is the complex puzzle surrounding the extensive variation in nuclear genome size among eukaryotic species.
[#227] The term Germplasm was given by
Correct Answer
(C) Weismann
Explanation
Solution: The term Germplasm was given by Weismann. Germplasm is a biological concept developed in the 19 th century by the German biologist August Weismann. It states that heritable information is transmitted only by germ cells in the gonads, not by somatic cells. The part of Weismann's theory that proved most vulnerable was his notion that the germ plasm was successively reduced during the division of somatic cells.
[#228] The macronutrients are the elements which are
Correct Answer
(D) Required by the plants in large quantities
Explanation
Solution: The macronutrients are the elements that are required by plants in large quantities. Macronutrients, or macros, are essential nutrients the body needs in large quantities to remain healthy. The primary macronutrients are Nitrogen (N), Phosphorus (P) and Potassium (K). Nitrogen is essential for plant development since it plays a fundamental role in energy metabolism and protein synthesis. Nitrogen is absorbed by the plant in the form of nitrate.
[#229] In sweet pea gene C or P alone produces white flower, where as both C and P are needed to produce purple coloured flower. In a particular cross between two white flowered plants the offsprings were one half purple and one-half white. The possible genotypes of the parents is
Correct Answer
(C) ccPp × CCpp
Explanation
Solution: In the sweet peas gene, C or P alone produces a white flower, whereas both C and P are needed to produce a purple-colored flower. In a particular cross between two white-flowered plants, the offspring were one-half purple and one-half white. The possible genotypes of the parents are ccPp × CCpp. As offspring are both purple and white therefore both the genes C and P must be in the heterozygous condition in parents either dominant or recessive form.
[#230] Accumulation of food in assimilatory cells results in
Correct Answer
(B) decrease in the rate of photosynthesis
Explanation
Solution: Accumulation of food in assimilatory cells results in a decrease in the rate of photosynthesis. If the end product of photosynthesis i.e. starch their food is already in the cells, then ultimately the rate of preparing food is low as the cells will be engaged in the process of respiration.