'Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of

1. maize

2. sugarcane

3. wheat

4. chilli

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

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

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

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

1. rye

2. pearl millete

3. sugarcane

4. barley

In order to obtain virus-free plants through tissue culture the best method is:

1. protoplast culture

2. embryo culture

3. anther culture

4. meristem culture