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Question

The origin of embryo from either synergids or antipodal cells of the embryosac is called

A
Apospory
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B
Apogamy
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C
Parthenogenesis
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D
Adventive embryony
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Solution

The correct option is B Apogamy

Apomixis refers to the development of seed without sexual fusion (fertilization). In apomixis embryo develops without fertilization. There are four types of apomixis:

1. Parthenogenesis - refers to development of embryo from the egg cell without fertilization.

2. Apogamy - The origin of embryo from either synergids or antipodal cells of the embryosac is called as apogamy.

Apospory - In apospory, first diploid cell of ovule lying outside the embryosac develops into another embryosac without reduction. The embryo then develops directly from the diploid egg cell without fertilization.

4. Adventive embryony - The development of embryo directly from the diploid cells of ovule lying outside the embryosac belonging to either nucellus or integuments is referred to as adventive embryony.


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