1. | haploids are reproductively more stable than diploids |
2. | mutagens penetrate in haploids more effectively than in diploids |
3. | haploids are more abundant in nature than diploids |
4. | all mutations, whether dominant or recessive are expressed in haploids |
Which one of the following is a viral disease of poultry?
1. Salmonellosis
2. Coryza
3. Newcastle disease
4. Pasteurellosis
Which one of the following is being utilized as a source of bio-diesel in the Indian countryside?
1. Euphorbia
2. Beetroot
3. Sugarcane
4. Pongamia
Crop plants grown in monoculture are:
1. low in yield
2. free from intraspecific competition
3. characterized by a 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 millet
3. sugarcane
4. barley
Select the incorrect statement:
1. | Inbreeding helps in the accumulation of superior genes and the elimination of undesirable genes |
2. | Inbreeding increases homozygosity |
3. | Inbreeding is essential to evolve pure lines in any animal |
4. | Inbreeding selects harmful recessive genes that reduce fertility and productivity |
Hisardale a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Merino rams is an example of
1. Outcrossing
2. Cross-breeding
3. Interspecific hybridisation
4. Outbreeding
Choose incorrect option :
1. More than 70 % of world livestock population is in India and China
2. Milk yielding capacity of buffaloes is three times more as compared to cows
3. Buffalo milk is superior to cow milk with respect to fat and mineral content
4. Continuous inbreeding increases the productivity of milk
Major drawback of inbreeding is
1. Increase in homozygosity
2. Decrease in immunity
3. Reduction in fertility
4. Increase in food consumption
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