Genetics And Plant Breeding - Study Mode
[#806] The gametophytic system of self-incompatibility was first reported in
Correct Answer
(A) Nicotiana sanderae
Explanation
Solution: The gametophytic system of self-incompatibility was first reported in Nicotiana sanderae. Gametophytic self-incompatibility is a type of self-incompatibility that was first described by east and mangeldorf in 1925 in tobacco. In this system, the incompatibility reaction of pollen is determined by its genotype and not by the genotype of the plant on which it is produced. It involves the inability of the gametes from the same parent plant to fuse and form a zygote or, if the zygote forms, then it fails to develop.
[#807] Transduction was discovered in virus by
Correct Answer
(A) Zinder & Lederberg
Explanation
Solution: Transduction was discovered in the virus by Zinder & Lederberg . Transduction is the process by which a virus transfers genetic material from one bacterium to another. Viruses called bacteriophages can infect bacterial cells and use them as hosts to make more viruses. Genetic recombination in bacteria in which genes from a host cell (a bacterium) are incorporated into the genome of a bacterial virus (bacteriophage) and then carried to another host cell when the bacteriophage initiates another cycle of infection.
[#808] The degenerative plant parts which are not useful for any processes are
Correct Answer
(C) Vestigial structure
Explanation
Solution: The degenerative plant parts which are not useful for any processes are vestigial structures. Vestigiality or vestigial structures are the retentions, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Plants also have vestigial parts, including functionless stipules and carpels, leaf reduction of Equisetum, and paraphyses of Fungi.
[#809] Acclimalisation means
Correct Answer
(D) A process of adjustment by crop plants to environment
Explanation
Solution: Acclimatization means a process of adjustment by crop plants to the environment. Acclimation is the capacity to adapt to environmental changes within the lifetime of an individual. This ability allows plants to cope with the continuous variation in ambient conditions to which they are exposed as sessile organisms.
[#810] The inherent capacity of an organism to increase in numbers under ideal condition is known as
Correct Answer
(C) Reproductive potential
Explanation
Solution: The inherent capacity of an organism to increase in numbers under ideal conditions is known as Reproductive potential . It is the relative capacity of a species to reproduce itself under optimum conditions. The reproductive success of plants is often the outcome of mutualistic and antagonistic plant-animal interactions. Plants may reproduce asexually or sexually. In asexual reproduction, an entirely new plant arises that is genetically identical to the parent plant. In sexual reproduction, egg and sperm cells combine to form a new plant that is genetically distinct from the parent plants.