BIOLOGICAL CLASSIFICATION
KINGDOM PLANTAE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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classification of Selaginella sp. is under phylum Lycophyta
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free-living gametophyte
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produce one type of spores
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antherozoids swim towards ovum
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Detailed explanation-1: -Hence, the correct answer is option B, protonema of moss and prothallus of Dryopteris are gametophytic.
Detailed explanation-2: -Meiosis within the capsule of the sporophyte yields haploid spores that are released and eventually germinate to form a male or female gametophyte.
Detailed explanation-3: -In the sporophyte phase a diploid (having two sets of chromosomes) plant body grows and eventually produces spores through meiosis. These spores divide mitotically to produce haploid (having a single set of chromosomes) gamete-producing bodies called gametophytes.
Detailed explanation-4: -Life Cycle Selaginella like other pteridophytes show alternation of generations. The life cycle alternates between diploid sporophyte and haploid gametophyte generation. This type of life cycle is called a haplo-diplontic life cycle. The sporophyte is the dominant phase in the life cycle.