The best breeding method for animals that are below average in productivity in milk production would be:
1. Inbreeding
2. Out-crossing
3. Cross-breeding
4. Interspecific hybridisation
Identify the option where all columns are not correctly matched:
Crop Variety Resistant to
1. Wheat Himgiri Leaf rust
2. Brassica Pusa Swarnim White rust
3. Cowpea Pusa komal Black rot
4. Chilli Pusa sadabahar Leaf curl
In mung bean the resistance to yellow mosaic virus and powdery mildew were introduced by:
1. Mutations
2. Hybridization
3. Tissue culture
4. Genetic engineering
Pusa Shubhra, an improved variety of cauliflower, is resistant to:
1. White rust
2. Bacterial blight
3. Black rot
4. Leaf curl
Inbreeding depression in animals can be overcome by:
1. A single outcross
2. Out cross for many generations
3. Cross-breeding
4. Inter-specific hybridization
Consider the following statements:
I: | Hairy leaves are associated with resistance to jassids in cotton and cereal leaf beetle in wheat. |
II: | Low aspartic acid, high nitrogen, and sugar content in maize leads to resistance to maize stem borers. |
III. | In wheat, solid stems lead to non-preference by the stem sawfly and smooth-leaved and nectar-less varieties of cotton do not attract bollworms. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I |
Column II |
I. Pusa Swarnim II. Pusa Shubhra III. Pusa Komal IV. Pusa Sawani |
1. Cauliflower 2. Brassica 3. Okra 4. Cow pea |
Codes
I II III IV
1. 1 2 3 4
2. 2 1 4 3
3. 2 1 3 4
4. 1 2 4 3
Homozygous purelines in cattle can be obtained by
(1) mating of related individuals of same breed
(2) mating of unrelated individuals of same breed
(3) mating of individuals of different breed
(4) mating of individuals of different species
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
A system of rotating crops with legume or grass pasture to improve soil structure and
fertility is called
1. contour farming
2. strip farming
3. shifting agriculture
4. ley farming