Q. No.Seed formation without fertilisation in flowering plants involves the process of
(1) budding
(2) somatic hybridization
(3) apomixis
(4) sporulation
The asexual production of seeds is called as:
1. Adventition
2. Fragmentation
3. Self-fertilization
4. Apomixis
Hybrid seeds have to be produced every year because:
(1) Hybrid plants become sterile in coming years
(2) They show more heterosis in coming years
(3) Hybrid vigour is not maintained beyond one generation as segregation of genes begins in the second generation
(4) Hybrid seed industry tends to increase cost of the seeds
Which of the following statements is false?
| 1. | Some 2000 years old viable seeds of Pheonix dactylifera were discovered during archaeological excavation of King Herod's palace near Dead Sea |
| 2. | Record of 10,000 years of dormancy of seeds has been estimated in Lupinus arcticus |
| 3. | The number of seeds in each fruit in case of orchid and some parasitic forms like Orobanche and Striga is one |
| 4. | Many fruits have evolved mechanisms for dispersal of seeds |
Nucellar polyembryony is reported in species of
(1) Gossypium
(2) Triticum
(3) Brassica
(4) Citrus
Active research is going on in many laboratories around the world to understand the genetics of apomixis. What is the purpose of such active research?
(1) Hybrid plants are directly formed by apomixis
(2) Apomixis is the method to produce seed without fertilization
(3) To transfer apomictic genes into hybrid varieties which will prevent loss of hybrid vigour with successive years
(4) Apomixis produces genetically different individuals
Mark the incorrect statement
1. Hybrid seeds have to be produced every year
2. Production of hybrid seeds is costly
3. If the seeds collected from hybrids are sown, the progeny do not maintain hybrid characters
4. Cultivation of hybrids has decreased productivity
Scientists are trying to transfer apomictic genes into hybrid varieties of several of our food and vegetable crops so that:
1. They get resistance against common pathogens
2. The yield of these plants can be increased many folds
3. Hybrid seeds need not be produced every year
4. Their germplasm is easily stored in labs for further research
Apomictic embryos in Citrus arise from
(1) synergids
(2) maternal sporophytic tissue in ovule
(3) antipodal cells
(4) diploid egg
What is the possible advantage if hybrids are made into apomicts?
1. Segregation of characters in the hybrid progeny
2. Farmers can keep on using the hybrid seeds to raise new crop in first year only
3. Absence of segregation in the hybrid progeny
4. More than one option is correct
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