Plant kingdom practice · Easy

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because mosses and lichens are indeed the first organisms to colonize rocks, and they decompose rocks by secreting acidic substances, which is why they are able to colonize rocks.

Option D (Bombax, Butea, Bauhinia) is the correct answer because these genera are commonly pollinated by animals, specifically birds and insects.

Option A (Three) is correct. Red algae exhibit Floridean starch, oogamous reproduction, and complex post-fertilization development. They lack archegonium and motile male gametes.

Option C is correct because red algae (Rhodophyta) lack flagellated stages in their life cycle, unlike green and brown algae.

Option D is correct because gymnosperm ovules are characterized by having a single integument (unitegmic) and being exposed or naked, not enclosed within an ovary.

Option A is correct because cyanobacteria, now classified as bacteria, are prokaryotic and thus not part of the eukaryotic Plantae kingdom, making the reason a correct explanation for the assertion.

Option A is correct because kelps are large brown algae that form extensive underwater forests in marine environments.

Option D (Rhodophyceae) is correct because Floridean starch is the storage polysaccharide found in red algae (Rhodophyceae).

Option A (Cellulose, Galactans, Mannans) is correct because the cell wall of algae is made up of cellulose, galactans, and mannans.

Option C (Pteridophytes) is correct because they are the first plants to possess vascular tissues (xylem and phloem) and are adapted to terrestrial environments.

Option D (Bryophytes) is correct because bryophytes are non-vascular plants that lack true roots, stems, and leaves; instead, they have rhizoids, stem-like, and leaf-like structures.

Option D (Dicotyledons) is correct because dicotyledons are angiosperms, and angiosperms evolved separately from progymnosperms, while seed ferns, conifers, and cycads are all related to progymnosperms.

Option D (Both Statement I and Statement II are correct) is correct because Spirogyra exhibits isogamous reproduction, and bryophyte antheridia produce biflagellated antherozoids.

Option B is correct because Chlamydomonas exhibits a haplontic life cycle, where meiosis occurs in the zygote, which is the only diploid stage.

Option A (Morphology) is correct because the Linnaean system of classification was primarily based on morphological characteristics.

Option B (chlorophyll c) is correct because brown algae possess chlorophyll a and chlorophyll c, along with fucoxanthin.

Option C (Bacterial & blue green algae) is correct because both bacteria and blue-green algae (cyanobacteria) have cell walls made of peptidoglycan.

Option A (Naked Ovules) is correct because a defining characteristic of gymnosperms is that their ovules are not enclosed within an ovary wall (naked).

Option D (Presence of Algal Zone) is correct because coralloid roots of Cycas have a symbiotic association with cyanobacteria, forming an algal zone, which distinguishes them from angiosperm roots.

Option B is correct. Volvox produces oogamous type of sexual reproduction where motile sperm fuses with large non-motile egg.

Option A (They require a layer of water for carrying out sexual reproduction) is correct because bryophytes need water for the sperm to swim to the archegonium for fertilization.

Option D (Byrophytes) is correct because bryophytes require water for fertilization, similar to amphibians.

Option B (Spores and gametes are invariably haploids) is correct because both spores and gametes are always haploid (n) as they are involved in sexual reproduction and life cycle continuation.

Option C (Independent sporophyte) is correct because ferns have an independent sporophyte generation, whereas in mosses, the sporophyte is dependent on the gametophyte for nutrition.

Option C (Pinus) is correct because in Pinus (a gymnosperm), the gametophyte is dependent on the sporophyte.

Option C (Anisogamy) is correct because anisogamy is defined as the fusion between two dissimilar gametes, which can be flagellated or non-flagellated.

Option C (Both Explanations are correct) is correct because Sphagnum can be used as fuel due to its carbon content and can absorb water due to its hyaline cells.

The correct answer is B (Sterile jacket) because bryophytes have a sterile jacket around their reproductive organs, whereas algae lack this protective layer.

Option B (Fucus does not show the same life-cycle pattern as most of the algae show) is correct because Fucus exhibits a diplontic life cycle, unlike most algae that have a haplontic or haplo-diplontic life cycle.

Option C (Humid, damp and shaded localities) is correct because bryophytes require moisture for reproduction and lack vascular tissues for efficient water transport, hence they thrive in such environments.