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प्रश्न
Higher Order Thinking Skill (HOT)
Polyploids are characterised by gigantism. Justify your answer.
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उत्तर
An organism having more than two set of chromosome is called polyploidy. It can be induced by physical agents such as heat or cold treatment, X-rays and chemical agents like colchicine. As organisms produced by polyploidy have more than two set of chromosomes they are gigantic.
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संबंधित प्रश्न
______ is the chemical used for doubling the chromosomes.
Rice normally grows well in alluvial soil, but ______ is a rice variety produced by mutation breeding that grows well in saline soil.
A group of plants produced from a single plant through vegetative or asexual reproduction are called a pureline.
Golden rice is a hybrid.
In vitro fertilisation means the fertilisation done inside the body.
Assertion: Colchicine reduces the chromosome number.
Reason: It promotes the movement of sister chromatids to the opposite poles.
Give the name of wheat variety having higher dietary fibre and protein.
Semi-dwarf varieties were introduced in rice. This was made possible by the presence of dwarfing gene in rice. Name this dwarfing gene.
Describe mutation breeding with an example.
Biofortification may help in removing hidden hunger. How?
