Semi-dwarf varieties were introduced in rice. This was made possible by the presence of dwarfing gene in rice. Name this dwarfing gene.

One Word/Term Answer

Dee-geo-woo-gen (DGWG)

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Methods of Plant Breeding for Crop Improvement

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Chapter 20 Breeding and Biotechnology
Evaluation | Q VI. 2. | Page 298

Which method of crop improvement can be practised by a farmer if he is inexperienced?

______ 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.

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.

State the importance of biofertiliser.

Biofortification may help in removing hidden hunger. How?

Higher Order Thinking Skill (HOT)

Polyploids are characterised by gigantism. Justify your answer.

Higher Order Thinking Skill (HOT)

‘P’ is a gene required for the synthesis of vitamin A. It is integrated with genome of ‘Q’ to produce genetically modified plant ‘R’.