When two unrelated individuals or lines are crossed, the performance of F₁ hybrid is often

superior to both its parents. This phenomenon is called

1. transformation

2. splicing

3. metamorphosis

4. heterosis

Breeding of crops with high levels of minerals, vitamins and proteins is called

1. somatic hybridisation

2. biofortification

3. biomagnification

4. micropropogation

Somaclones are obtained by

1. tissue culture

2. plant breeding

3. irradiation

4. genetic engineering

Polyethylene glycol method is used for

1. gene transfer without a vector

2. biodiesel production

3. seedless fruit production

4. energy production from sewage

Transgenic plants are

1. produced by a somatic embryo in artificial medium

2. generated by introducing foreign DNA in to a cell and regenerating a plant from that

cell

3. produced after protoplast fusion in artificial medium

4. grown in artificial medium after hybridisation in the field

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

1. the egg is divided into 4 pairs of cells which are implanted into the womb of other cows

2. in the eight cell stage, cells are separated and cultured until small embryos are formed

which are implanted into the womb of other cows

3. in the eight cell stage the individual cells are separated under electrical field for further

development in culture media

4. from this upto eight identical twins can be produced

In maize, hybrid vigour is exploited by:

1. bombarding the seeds with DNA

2. crossing of two inbred parental lines

3. harvesting seeds from the most productive plants

4. inducing mutations

Which one of the following is a viral disease of poultry ?

1. Salmonellosis

2. Coryza

3. New castle disease

4. Pasteurellosis

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

1. alleviation of vitamin- A deficiency

2. pest resistance

3. herbicide tolerance

4. producing a petrol-like fuel from rice

Crop plants grown in monoculture are:

1. low in yield

2. free from intraspecific competition

3. characterised by poor root system

4. highly prone to pests