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Sexual Reproduction in Flowering Plants
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In which of the following sets of families, the pollen grains are viable for months?A Solanaceae, Poaceae and LiliaceaeB Brassicaceae, Liliaceae and PoaceaeC Rosaceae, Liliaceae and PoaceaeD Leguminosae, Solanaceae and RosaceaeIn some species belonging to families like Leguminosae, Solanaceae, and Rosaceae, pollen grains maintain their viability for several months.
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Transfer of pollen grains from anther to stigma of another flower of same plant is known as:A GeitonogamyB XenogamyC AutogamyD CleistogamyGeitonogamy is the transfer of pollen grains from the anther of one flower to the stigma of another flower on the same plant. (Xenogamy is transfer between flowers on different plants; autogamy is self-pollination within the same flower.)
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In angiosperms the correct sequence of events in formation of female gametophyte in the ovule is: (A) 3 successive free nuclear divisions functional megaspore. (B) Degeneration of 3 megaspores. (C) Meiotic division in megaspore mother cell. (D) Migration of 3 nuclei towards each pole. (E) Formation of wall resulting in seven celled embryosac. Choose the correct answer from the options given below:A (A), (B), (C), (D), (E)B (C), (E), (A), (D), (B)C (B), (C), (A), (D), (E)D (C), (B), (A), (D), (E)The correct sequence is: Meiotic division in the megaspore mother cell producing four megaspores (C) → Degeneration of 3 of the 4 megaspores, leaving one functional megaspore (B) → 3 successive free nuclear divisions of the functional megaspore (A) → Migration of nuclei (3 towards each pole) (D) → Formation of cell walls resulting in the seven-celled, eight-nucleate embryo sac (E). Order: C, B, A, D, E.