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Somaclonal variation appears in
(d) Somaclonal variations is the term used to describe the variation seen in plants that have been produced by plant tissue culture. Chromosomal rearrangements are an important source of this variation.
Somaclonal variation is seen in
Genetic variation present among plant cells of a culture is called somaclonal variation. The term is also used for the genetic variation present in plants regenerated from a single culture. This variation has been used to develop sexual/useful variation.
Which of the following species has the chromosome complement similar to that of Triticum aestivum ?
(C): The chromosome complement of Triticum aestivum (2n=26) is similar to that of Gossypium whose ploidy level is also 2n=26. Zea mays has ploidy level of 2n=20. Secale and Aegilops both have the similar ploidy level of 2n=14.
Apiculture is associated with which of the following groups of plants ?
(c)Apiculture is basically associated with the flowering plants. It refers to the scientific way of beekeeping. It helps in the growth of Guava, sunflower, strawberry, pineapple, etc.
Pebrine in silkworms is caused by:-
Pebrine or pepper disease is caused by protozoan Nosema bombycis. The parasite infects eggs and is therefore, transmitted to next generation. It kills caterpillars.
Which of the following is not true for inbreeding?
(b) Inbreeing leads to increase in homozygosity. This, in recessive alleles. Also, inbreeding depression may lead to loss of fitness in progenies, thus decreasing productivity in some cases.
The phenomenon that operates in the formation of root or shoot in a callus culture is
(a) The cells derived from root apical and shoot apical meristems and cambium differentiate and mature to perform special functions. This act leading to maturation is termed as differentiation. During differentiation, cells undergo few to major structural changes both in their cell walls and protoplasm.
Match Column - 1 with Column - II and select the correct option from given codes.
Column I Column - II
A. Brassica (i) Himgiri
B. Okra (ii) Pusa Komal
C. Wheat (iii) Pusa Gaurav
D. Cowpea (iv) Pusa Sawani
(a)
The number of chromosomes present in the cells of the bread wheat, Triticum aestivum suggests that it is
(a) Bread wheat is an allohexaploid, an allopolyploid, with six sets of chromosomes.
Which one of the following methods is commonly used to maintain the genetic traits of a given plant ?
(b) The propogation through vegetative multiplication is used to maintain the genetic traits of a given plant. It gives rise to genetically uniform population or clone. In case of plants propogated through seeds, variations creep in due to chance segregation and recombination of genes during meiosis and their chance combination during fertilisation.
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