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Question
Assertion :The main plant body of bryophytes is gametophyte. Reason: Alternation of generation is absent in bryophytes.
Assertion :The main plant body of bryophytes is gametophyte. Reason: Alternation of generation is absent in bryophytes.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
The main plant body of bryophytes is gametophyte but not because alternation of generation is absent in bryophytes. Bryophytes show alternation of generations. A haploid gametophyte, each of whose cells contains a fixed number of unpaired chromosomes, gives rise to a diploid sporophyte, each of whose cells contains twice the number of paired chromosomes. Gametophytes produce sperm and eggs which fuse and grow into sporophytes. Sporophytes produce spores which grow into gametophytes. Bryophytes are gametophyte dominant, meaning that the more prominent, longer-lived plant is the haploid gametophyte. The diploid sporophytes appear only occasionally and remain attached to and nutritionally dependent on the gametophyte. They produce a single sporangium.Therefore, the correct answer is option C.
The main plant body of bryophytes is gametophyte but not because alternation of generation is absent in bryophytes. Bryophytes show alternation of generations. A haploid gametophyte, each of whose cells contains a fixed number of unpaired chromosomes, gives rise to a diploid sporophyte, each of whose cells contains twice the number of paired chromosomes. Gametophytes produce sperm and eggs which fuse and grow into sporophytes. Sporophytes produce spores which grow into gametophytes. Bryophytes are gametophyte dominant, meaning that the more prominent, longer-lived plant is the haploid gametophyte. The diploid sporophytes appear only occasionally and remain attached to and nutritionally dependent on the gametophyte. They produce a single sporangium.
Therefore, the correct answer is option C.
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