Outbreeding is an important stategy of animal husbandry because it
1. help in accumulation of superior genes
2. is useful in producing purelines of animals
3. is useful in overcoming inbreeding depression
4. exposes harmful recessive genes that are eliminated by selection
In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called
1. selection of superior recombinations
2. cross-hybridisation among the selected parents
3. evaluation and selection of parents
4. germplasm collection
'Jaya', and 'Ratna', developed for green revolution in India are the varieties of
1. rice
2. wheat
3. bajra
4. maize
'Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of
1. maize
2. sugarcane
3. wheat
4. chilli
Breeding of crops with high levels of minerals, vitamins and proteins is called
1. somatic hybridisation
2. biofortification
3. biomagnification
4. micropropogation
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
People recovering from long illness are often advised to include the alga Spirulina in their
diet because it
1. makes the food easy to digest
2. is rich in proteins
3. has antibiotic properties
4. restores the intestinal microflora.
Which of the following is not true for inbreeding?
(1) It causes inbreeding depression after a few generations.
(2) It always increases the productivity.
(3) It is used to produce a pure line.
(4) It leads to homozygosity.
Identify the correct matches for crops and their improved varieties
Crops Varieties Disease
(1) Wheat Karan rai White rust
(2) Cauliflower Pusa Shubhna Leaf and stripe rust
(3) Cowpea Pusa Koma Hill bunt
(4) Chill Pusa Sadabahar Tobacco mosaic virus and leaf curl
Interspecific hybridisation is the mating of
(1) animals within same breed without having common ancestors
(2) two different related species
(3) superior males and females of different breeds
(4) more closely related individuals within same breed for 4-6 generations