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12th Standard English Medium Biology (Botany) Subject Plant Breeding Creative 2 Mark Questions with Solution Part - II

Published on: 22/06/2021

QB365 provides detailed and simple solution for every Creative Questions in class 12 Biology Subject. It will helps to get more idea about question pattern in every Creative questions with solution.

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Std: 12th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Name the insect resistant varieties developed in the following crops.
(a) Okra (b) Rapeseed mustard.

State anyone advantage and one disadvantage of polyploid breeding.

Define Heterosis?

Who coined the term "pureline"? Define it.

What are bio-pesticides? Why they are considered better than synthetic pesticides?

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Answers Key:

Generic 2

5 x 2 = 10

(a) Okra: Pusa Sawani and Pusa A-4 varieties of Okra are resistant to shoot and fruit borers.
(b) Rapeseed mustard: Pusa Gaurav variety of rapeseed mustard shown resistance against Aphids.

Advantage: Polyploidy often exhibit hybrid vigour and increased tolerance to biotic and abiotic stresses.
Disadvantage: Polyploidy results in reduced fertility due to meiotic error resulting in seedless varieties.

The superiority of the F1 hybrid in performance over its parents is called heterosis or hybrid vigour.

Johannsen in 1903 coined the word pureline. It is a collection of plants obtained as a result of repeated self-pollination from a single homozygous individual.

Bio-pesticides are biologically based agents used for the control of plant pests. They are in high use due to their non-toxic, cheaper and eco-friendly characteristics as compared to chemical or synthetic pesticides.