Embryo sac is diploid because it is formed without meiosis i.e reduction division. The diploid cells divide and form embryo sac giving rise to a diploid sac.
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Long Answer Type
36.Draw L.S. of typical flower showing its parts.
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37.
Draw well labelled diagram of
A. Transverse section of anther. B. Enlarged view of one microsporangium showing wall layers
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38.Describe the structure of microsporangium.
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39.Describe the development of microspore in angiosperms.
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Short Answer Type
40.Draw a diagrammatic sketch of the sectional view of a typical anatropous ovule.