Somaclonal variation can be obtained by

• application of colchicine

• irradiation with gamma rays

• tissue culture

• hybridisation.

Assertion : Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops.

Reason : A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the crop with which the bacterium is associated.

• If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

• If Assertion is true but Reason is false.

• If both Assertion and Reason are false.

173.

Assertion: Cattle breeds can be improved by superovulation and embryo transplantation.

Reason: Superovulation in high milk-yielding cows is induced by hormonal injection.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

Long fibres of cotton seed are known as

• coir

• fuzz

• lint

• flax

Pests which only feed and oviposit on crop are called

• major pests

• minor pests

• accidental pests

• occasional pests

In which stage of its life cycle, the silk moth begins to produce silk fibre?

• 3^rd instar larva

• 4^th instar larva

• 5^th instar larva

• Pupa

Which one of the following is the American poultry breed

• Australop

• Assel

• Minorica

• Rhod Island Red

Transposons are

• house-keeping genes

• jumping genes

• transporting genes

• stationary genes

First genetically modified plant commercially released in India is

• golden rice

• slow ripening tomato

• Bt brinjal

• Bt cotton

Cotton fibre is basically a type of

• trichome

• scale

• dried seed coat

• non glandular hair