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Question
Tetrasporic embryosac is formed in
Tetrasporic embryosac is formed in
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Solution
The correct option is B Peperomia type
In some cases, a meiotic division of the megaspore mother cell is not accompanied by cytokinesis and hence all the four haploid nuclei lie in a single cell called coeno-megaspore. All the four nuclei of coeno-megaspore participate in the formation of the embryo sac. This type of embryo sac is called as tetrasporic like in Peperomia. The four haploid nuclei of coeno-megaspore undergo two successive mitotic divisions forming 16 nuclei. Of these two nuclei at the micropylar end forms egg and a synergid, eight fuse in the centre of the cell to form a polar nucleus and the remaining six which are cut off by membranes at the chalazal end may be compared with antipodals. Thus, the egg apparatus of Peperomia type is characterised by a single synergid.
Thus, the correct answer is option C.
In some cases, a meiotic division of the megaspore mother cell is not accompanied by cytokinesis and hence all the four haploid nuclei lie in a single cell called coeno-megaspore. All the four nuclei of coeno-megaspore participate in the formation of the embryo sac. This type of embryo sac is called as tetrasporic like in Peperomia. The four haploid nuclei of coeno-megaspore undergo two successive mitotic divisions forming 16 nuclei. Of these two nuclei at the micropylar end forms egg and a synergid, eight fuse in the centre of the cell to form a polar nucleus and the remaining six which are cut off by membranes at the chalazal end may be compared with antipodals. Thus, the egg apparatus of Peperomia type is characterised by a single synergid.
Thus, the correct answer is option C.
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