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Question
The process in which haploid embryo is formed from haploid egg without fertilization is called as
The process in which haploid embryo is formed from haploid egg without fertilization is called as
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Solution
The correct option is B Non-recurrent agamospermy
- A Agamospermy (seed is retained as agent of propagation but the embryo is formed by some process in which normal meiosis and syngamy have been eliminated).
- Two different types of agamospermy have been recognized based on whether the embryo develops from a cell of the unreduced female gametophyte (gametophytic agamospermy) or directly from diploid sporophytic cells of the ovule such as nucellus or integuments (sporophytic or adventive embryony).
- In gametophytic apomixis, an unreduced embryo sac develops from the megaspore mother cell by circumvention of meiosis (Diplospory) or directly from a cell in the nucellus (Apospory). In apospory megaspore, mother cell is not differentiated and diploid somatic cell acts as a spore.
- In adventive embryony spore itself is not differentiated. The embryo is formed by the unfertilized egg (parthenogenesis) or some other cell of the embryo sac.
- When an embryo develops directly from a diploid egg the process is also called recurrent agamospermy.
- In Non-recurrent Agamospermy, the embryo develops parthenogenetically from haploid egg.
- So, the correct answer is 'All of the above'
- A Agamospermy (seed is retained as agent of propagation but the embryo is formed by some process in which normal meiosis and syngamy have been eliminated).
- Two different types of agamospermy have been recognized based on whether the embryo develops from a cell of the unreduced female gametophyte (gametophytic agamospermy) or directly from diploid sporophytic cells of the ovule such as nucellus or integuments (sporophytic or adventive embryony).
- In gametophytic apomixis, an unreduced embryo sac develops from the megaspore mother cell by circumvention of meiosis (Diplospory) or directly from a cell in the nucellus (Apospory). In apospory megaspore, mother cell is not differentiated and diploid somatic cell acts as a spore.
- In adventive embryony spore itself is not differentiated. The embryo is formed by the unfertilized egg (parthenogenesis) or some other cell of the embryo sac.
- When an embryo develops directly from a diploid egg the process is also called recurrent agamospermy.
- In Non-recurrent Agamospermy, the embryo develops parthenogenetically from haploid egg.
- So, the correct answer is 'All of the above'
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