Apomixis and polyembryony — practice questions
5 questions in the bank on this idea. Below are 5 of them, exactly as they appear in a test.
What is apomixis?
- A. Vegetative propagation by stem cutting
- B. Fruit formation only after double fertilisation
- C. Pollen formation without meiosis only
- D. Seed formation without fertilisation
What does polyembryony mean?
- A. Occurrence of more than one embryo in a seed
- B. Formation of more than one pollen grain
- C. Development of several ovaries in one flower
- D. Presence of two stigmas
Why can apomixis be useful in maintaining desirable hybrid characters?
- A. It always increases recombination
- B. It can produce seeds without meiotic segregation and fertilisation
- C. It forces all plants to self-pollinate
- D. It converts hybrids into haploids
A seed contains one embryo formed from the zygote and another embryo formed from surrounding maternal tissue. Which phenomenon is illustrated?
- A. Self-incompatibility
- B. Dichogamy
- C. Polyembryony
- D. Triple fusion
A breeder wants offspring from a superior hybrid to remain genetically very similar across seed generations. Which reproductive process would best help achieve this goal?
- A. Meiosis followed by ordinary fertilisation
- B. Repeated sexual reproduction with random segregation
- C. Cross-pollination between unrelated varieties
- D. Apomictic seed formation
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