Plant kingdom practice · Mixed difficulty

Option B (Both A and R are true and R is not the correct explanation of A) is correct because Monotropa is indeed a parasitic plant, and while it associates with mycorrhizae, the association is not proper in the sense of being mutually beneficial; however, the latter doesn't directly explain the former.

Option D (thick cuticle) is correct because the thick cuticle helps conifers reduce water loss in harsh environments.

Option A (Blue-green pigment) is correct because cyanobacteria, also known as blue-green algae, contain blue-green pigments (phycocyanin and chlorophyll a).

Option A (Gametophyte) is correct because sexual reproduction in pteridophytes occurs within the gametophyte generation, which produces the gametes.

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 (Ginkgo) is correct because Ginkgo biloba is the only living species of its genus and is often referred to as a living fossil or maidenhair tree.

Option C (Chl a, Chl c and fucoxanthin) is correct because Kelp and Ectocarpus, both brown algae, contain chlorophyll a, chlorophyll c, and fucoxanthin.

Option B (Bryophytes) is correct because bryophytes have a dominant and independent haploid gametophyte that alternates with a short-lived, dependent sporophyte.

Option B (A-zygote; B-syngamy) is correct because in angiospermic fertilization, one male gamete fuses with the egg to form a zygote, and this process is called syngamy.

Option C (Angiosperms) is correct because double fertilization, involving the fusion of two sperm nuclei with the egg cell and polar nuclei, is a unique characteristic of angiosperms.

Option A (Polysiphonia) is correct because Phycoerythrin is a red pigment found in red algae like Polysiphonia.

Option D (Pinus) is correct because Pinus, a gymnosperm, produces seeds but does not produce flowers.

Option A (Haploid) is correct because the endosperm in gymnosperms like Pinus is formed before fertilization and is therefore haploid (n).

Option B (Sporophyte) is correct because the moss capsule is the spore-bearing structure, which is part of the sporophyte generation in mosses.

Option A (Marchentia) is correct because Marchantia is a liverwort with a thalloid plant body, meaning it has a flat, undifferentiated structure.

Option B (Pteridophytes) is correct because pteridophytes are the first group of plants to evolve true vascular tissues, xylem and phloem, enabling them to grow taller and colonize terrestrial environments more effectively.

Option C (Pinus seeds cannot germinate and establish without the presence of mycorrhizae) is correct because Pinus seeds require a symbiotic relationship with mycorrhizae for nutrient uptake and successful germination.

Option C (Both (a) and (b)) is correct because isogamy, the fusion of morphologically similar gametes, is found in both Spirogyra and Chlamydomonas.

Option B (Both A and R are true and R is not the correct explanation of A) is correct because dwarf roots in Pinus become mycorrhizal, and Pinus seeds are polycotyledonous, but the latter doesn't explain the former.

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 C (Zoospore) is correct because zoospores are flagellated, motile spores produced by algae and some fungi.

Option A (Dicotyledonous) is correct because Cycas seeds have two cotyledons, making them dicotyledonous, and they are also endospermic.

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 (Azolla) is correct because Azolla is an aquatic fern that forms a symbiotic relationship with nitrogen-fixing cyanobacteria (Anabaena azollae), making it a symbolic nitrogen-fixing plant.

Option B is correct because Spirogyra is a filamentous green alga (Chlorophyceae) and thus a chlorophyllous thallophyte.

Option A (Haplontic) is correct because Spirogyra exhibits a haplontic life cycle where the dominant phase is haploid.

Option B (If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion) is correct because algin is obtained from algae, and rust of wheat is due to Puccinia, but these two facts are unrelated.

Option A (Engler and Prantl) is correct because Engler and Prantl developed the phylogenetic system of classification, which is based on evolutionary relationships.