Genetics And Plant Breeding - Study Mode
[#76] Cytoplasmic male sterility is best suited for hybrid seed production in
Correct Answer
(C) Vegetatively propagated crops
Explanation
Solution: Cytoplasmic male sterility is best suited for hybrid seed production in Vegetatively propagated crops. Cytoplasmic male sterility (CMS), a condition under which a plant is unable to produce functional pollen, is widespread among higher plants. CMS systems represent a valuable tool in the production of hybrid seeds in self-pollinating crop species, including maize, rice, cotton, and several vegetable crops.
[#77] Half gram seeds are working sample for
Correct Answer
(C) Tobacco
Explanation
Solution: Half-gram seeds are working samples for Tobacco. It is the reduced sample with the required weight obtained from the submitted sample after repeated mixing and dividing with which the seed quality tests are conducted in the seed testing laboratory. Random and representative samples of seeds are taken from all the lots in each variety for a check about their physical purity, varietal purity, moisture content, and germination percentage. At least 0.5 g sample from each lot is examined for this purpose.
[#78] Mendel did not face the problem of linkage, however, seven characters studied by him were located on how many chromosomes
Correct Answer
(A) Four
Explanation
Solution: Mendel did not face the problem of linkage, however, seven characters studied by him were located on Four chromosomes. Mendel worked with seven characteristics of pea plants: plant height, pod shape and colour, seed shape and colour, and flower position and colour. As all the seven characters taken by Mendel were present on four different chromosomes and also if present on the same were situated at far distances, that is why he did not face the problem of linkage.
[#79] The crossing between two different genera of the same genus is called
Correct Answer
(A) Intergeneric hybridization
Explanation
Solution: The crossing between two different genera of the same genus is called Intergeneric hybridization. Intergeneric hybridization represents an opportunity to combine genomes from distinctly different plants and to intrigue traits not found in the main genus of interest. Many intergeneric hybrids are infertile.
[#80] Argemone mexicana is an objectional weed in:
Correct Answer
(C) Rapeseed/Mustard
Explanation
Solution: Argemone mexicana is an objectional weed in Rapeseed/Mustard. An extremely hardy pioneer plant, it is tolerant of drought and poor soil, often being the only cover on new road cuttings or verges. It has bright yellow latex. It is poisonous to grazing animals. The seeds resemble the seeds of Brassica nigra (mustard). They mature with mustard crops and may be harvested along with mustard. As a result, mustard can be adulterated by argemone seeds, rendering it poisonous.