Q. No.The reason why vegetatively reproducing crop plants are best suited for maintaining hybrid vigor is that (CBSE-PMT 1998)
1. They can be easily propagated.
2. They have a longer life pan.
3. They are more resistant to diseases.
4. Once a desired hybrid is produced, there are no chances of losing it.
1. They can be easily propagated.
2. They have a longer life pan.
3. They are more resistant to diseases.
4. Once a desired hybrid is produced, there are no chances of losing it.
The world’s highly prized wool yielding Pashmina breed is
1. Kashmir sheep - Afgan sheep cross.
2. Goat
3. Sheep
4. Goat - sheep cross
The name of Norman Borlaug is associated with
1. Green revolution
2. White revolution
3. Yellow revolution
4. Blue revolution
Three crops that contribute maximum to global food grain production are
1. wheat , rice and maize
2. Rice, maize and sorghum
3. Wheat, maize and sorghum
4. Wheat, rice and barley
Why is vivipary an undesirable character for annual crop plants
1. It reduces the vigor of the plant.
2. The seeds exhibit long dormancy.
3. It adversely affects the fertility of the plant.
4. The seeds cannot be stored under normal conditions for next season.
Triticale, the first man-made cereal, has been obtained by crossing wheat with
1. Rye
2. Pearl millet
3. Sugarcane
4. Barley
Crop plants grown in monoculture are
1. Low in yield.
2. Free from intraspecific competition.
3. Characterized by poor root system.
4. Highly prone to pests.
In order to obtain virus-free plants through tissue culture the best method is
1. protoplast culture
2. embryo rescue
3. anther culture
4. meristem culture
In maize, hybrid vigor is exploited by
1. bombarding the protoplast with DNA
2. crossing of two inbred parental lines
3. harvesting seeds from the most productive plants
4. inducing mutations
In the cloning of cattle, a fertilized egg is taken out of the mother’s womb and:
| 1. | From this up to eight identical twins can be produced |
| 2. | The egg is divided into four pairs of cells that are implanted into the womb of other cows. |
| 3. | In the eight-cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows. |
| 4. | In the eight-cell stage, the individual cells are separated under the electrical field for further development in culture media. |
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