Crop Variety Improvement

Disease resistant plants can be produced by

• use of antibiotics

• genetic modification

• hybridisation

• both (b) and (c)

crop production can be stabilised by developing crop varieties with wider adaptability because

• a single variety can be grown under different climatic conditions in different regions

• that variety will have resistance to a wide variety of pests

• the variety can be grown under same climatic conditions

• that variety will be higher yielding than many other varieties

Find out the correct statement

(a) hybridisation means crossing between genetically dissimilar plants

(b) cross between varieties is called as inter specific hybridisation

(c) genetically modified crops are produced by introducing genes of desired character into a plant.

(d) cross between plants of two species is called inter varietal hybridisation

• (b) and (d)

• (a) and (c)

• (a) and (b)

• (c) and (d)

Assertion: tallness and profuse branching are desirable characters for cereals.

Reason: crop varieties with wider adaptability will stabilise crop production under different environmental conditions

• None of the statements are correct

• both are correct

• Assertion is false but the reason is true

• Assertion is true but reason is false

Dwarfness in cereals is a desirable agronomic trait because

• they are easy to harvest

• they give good fodder to cattle

• they are disease resistant

• they consume less nutrients