Bryophytes are also called amphibians of the plant kingdom because these plants can live in soil but are dependent on water for sexual reproduction. They usually occur in damp, humid and shaded localities. They play an important role in plant succession on bare rocks/soil.
Which of the following statements are NOT correct regarding the general characteristics and ecological roles of bryophytes? S1: Bryophytes are considered amphibians of the plant kingdom primarily because their sporophyte generation is free-living and thrives in both aquatic and terrestrial environments. S2: The plant body of bryophytes is more differentiated than that of algae, often possessing true roots, stems, and leaves. S3: Mosses, along with lichens, play an important role in plant succession on bare rocks by secreting acids that dissolve the rocks, making the substrate suitable for higher plants. S4: The sporophyte of bryophytes is consistently more elaborate and independent than their gametophyte, performing its own photosynthesis. S5: Sphagnum, a moss, is known for its ability to hold large amounts of water, which makes it valuable as a fuel and packing material, but it does not contribute significantly to peat formation.
Correct answer: C — S1, S2, S4 and S5 only
The core concept here is the general characteristics, habitat, and ecological importance of bryophytes. S1: "Bryophytes are also called amphibians of the plant kingdom because these plants can live in soil but are dependent on water for sexual reproduction." This statement is incorrect because the reason for being called amphibians is dependence on water for sexual reproduction, and the sporophyte is not free-living or independent. S2: "They lack true roots, stem or leaves." This statement is incorrect as bryophytes lack true roots, stems, and leaves. S3: "Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants." This statement is correct, as mosses and lichens decompose rocks. The mention of 'secreting acids' is typically associated with lichens, but the overall role is accurate. S4: "The sporophyte is not free-living but attached to the photosynthetic gametophyte and derives nourishment from it." This statement is incorrect because the sporophyte is neither dominant nor independent, and it depends on the gametophyte for nourishment. S5: "Species of Sphagnum, a moss, provide peat that have long been used as fuel..." This statement is incorrect because Sphagnum does contribute significantly to peat formation. Therefore, statements S1, S2, S4, and S5 are NOT correct. The final answer is C because statements S1, S2, S4, and S5 are all incorrect based on the NCERT text.
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