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Study the following statements and choose the correct option.
$I -$ Tapetum nourishes the developing pollen grains.
$II-$ Hilum represents the junction between ovule and funicle
$III-$ In aquatic plants such as water hyacinth and water lily, pollination is by water:
$IV-$ The primary endosperm nucleus is tripoid.
$I \;and \;II\; are \;correct \;but \;III \;and \;IV \;are\; incorrect$
$I, II \;and \;IV \;are \;correct\; but \;is \;incorrect$
$II, \;III \;and \;IV \;are \;correct \;but \;I \;is \;incorrect$
$I \;and \;IV\; are\; correct \;but\; II\; and \;III \;are\; incorrect$
Solution
The innermost wall layer of microporangium is the tapetum. Cells of tapetum possess dense cytoplasm and generally have more than one nucleus. Tapetum nourishes the developing pollen grains. The body of the ovule fuses with funicle (stalk of ovule) in the region called hilum. Thus, hilum represents the junction between ovule and funicle. The primary endosperm nucleus is triploid $(3 n)$ as it is the product of triple fusionIn majority of aquatic plants such as water hyacinth and water lily, the flower emerge above the level of water and are pollinated by insects or wind as in most of the land plants.
