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Question
Which of the following forms monosporic embryo sac?
Which of the following forms monosporic embryo sac?
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Solution
The correct option is A Oenothera type
When the mature embryo sac is organized in an egg apparatus with a uninucleate central cell it is said to be oenothera type. The micropylar megaspore of the tetrad gives rise to this embryo sac by two nuclear divisions. This results in the formation of four nuclei in the form of two synergids, egg and a polar nucleus. A third division is absent and all the nuclei are situated in the micropylar region of the developing embryo sac. Hence a lower polar nucleus and antipodal cells are absent. Thus the correct answer is option A.
When the mature embryo sac is organized in an egg apparatus with a uninucleate central cell it is said to be oenothera type. The micropylar megaspore of the tetrad gives rise to this embryo sac by two nuclear divisions. This results in the formation of four nuclei in the form of two synergids, egg and a polar nucleus. A third division is absent and all the nuclei are situated in the micropylar region of the developing embryo sac. Hence a lower polar nucleus and antipodal cells are absent. Thus the correct answer is option A.
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