When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called

(a) transformation

(b) splicing

(c) metamorphosis

(d) heterosis

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Plant Breeding & Its Steps
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Breeding of crops with high levels of minerals, vitamins and proteins is called

(a) somatic hybridisation

(b) biofortification

(c) biomagnification

(d) micropropogation

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Somaclones are obtained by

(a) tissue culture

(b) plant breeding

(c) irradiation

(d) genetic engineering

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Transgenic plants are

(a) produced by a somatic embryo in artificial medium

(b) generated by introducing foreign DNA in to a cell and regenerating a plant from that cell

(c) produced after protoplast fusion in artificial medium

(d) grown in artificial medium after hybridisation in the field

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In cloning of cattle a fertilized egg is taken out of the mother's womb and:

(a) the egg is divided into 4 pairs of cells which are implanted into the womb of other cows

(b) in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows

(c) in the eight cell stage the individual cells are separated under electrical field for further development in culture media

(d) from this upto eight identical twins can be produced

Concept Questions :-

Animal Husbandry
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In maize, hybrid vigour is exploited by:

(a) bombarding the seeds with DNA

(b) crossing of two inbred parental lines

(c) harvesting seeds from the most productive plants

(d) inducing mutations

Concept Questions :-

Impact:Green Revolution
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Which one of the following is a viral disease of poultry ?

(a) Salmonellosis

(b) Coryza

(c) New castle disease

(d) Pasteurellosis

Concept Questions :-

Animal Husbandry
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Golden rice is a promising transgenic crop. When released for cultivation, it will help in:

(a) alleviation of vitamin- A deficiency

(b) pest resistance

(c) herbicide tolerance

(d) producing a petrol-like fuel from rice

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Crop plants grown in monoculture are:

(a) low in yield

(b) free from intraspecific competition

(c) characterised by poor root system

(d) highly prone to pests

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Triticale, the first man-made cereal crop, has been obtained by crossing wheat with: 

(a) rye

(b) pearl millete

(c) sugarcane

(d) barley

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