Horticulture - Study Mode
[#541] Segmental allopolyploidy is found in
Correct Answer
(C) Potato
Explanation
Solution: Segmental allopolyploidy is found in potatoes. Segmental allopolyploidy is an intermediate point between autopolyploidy and allopolyploidy. These are both recombinations within subgenomes (disomic inheritance) and between subgenomes (tetrasomic inheritance) that occur during meiosis. The effects of autopolyploidization at morphological, physiological and molecular levels have been explored and no evident phenotypic superiority of polyploid lines concerning the parental diploid lines has been found. There were DNA methylation changes between diploids and polyploids, indicating that polyploidization alters the epigenetic patterns in potatoes.
[#542] Disease free plants in micropropagation can be obtained through
Correct Answer
(C) Meristem culture
Explanation
Solution: Disease-free plants in micro-propagation can be obtained through meristem culture . Meristem culture is a tissue culture technique that uses an apical meristem with 1 - 3 leaf primordia to prepare vegetative propagation clones of a plant. The main aim of this culture is to obtain disease-free plants, and shoot tips of up to 10 mm are used. For rapid clonal propagation, a shoot-tip culture is followed in which (5 - 10 mm) explants are used. Hence, the majority of meristem cultures are essentially shoot-tip cultures. It happens because its active cell division reduces the differentiation of vascular tissues.
[#543] Necrosis susceptible variety of Aonla is
Correct Answer
(D) Francis
Explanation
Solution: The necrosis susceptible variety of Aonla is Francis . Necrosis, a physiological disorder has been observed in aonla fruits. This particular disorder has been observed mostly in the case of Banarasi and Francis varieties. Fully developed brown-colored fruits are harvested. Delay in harvesting results in heavy dropping of fruits in case of some varieties. This variety is physically erect and tall tree, good and regular bearer, Branches have the drooping habit. Large fruited weighing about 63 gms, oval roundish, light green, slightly fibrous, moderately juicy.
[#544] Protandry is a problem in
Correct Answer
(B) Walnut
Explanation
Solution: Protandry is a problem in Walnut . Protandry is the condition in which the male reproductive organs (stamens) of a flower mature before the female ones (carpels), thereby ensuring that self-fertilization does not occur. It is a state in hermaphroditic systems that are characterized by the development of male organs or maturation of their products before the appearance of the corresponding female product thus inhibiting self-fertilization and that is encountered commonly in mints, legumes, carrots, walnut, etc. In walnut, pollen is shed before the ovules are mature.
[#545] Fertilizer important for carrot is
Correct Answer
(A) K
Explanation
Solution: The fertilizer important for carrots is K (Potassium). For Carrot plants, it is best to choose a fertilizer low in nitrogen and high in phosphate and potassium. 0-10-10 or 5-15-15 fertilizer will work well for the Carrot plant. It is because potassium and phosphate promote root growth in carrots, and these nutrients will help their better growth.