Quiz_Pteridophyta 1. The chief function of the indusium of the fern is: To produce sporophylls Protective No function To produce spores Explanation:The indusium is a thin, membranous covering that protects the developing sporangia in ferns. It helps shield the sporangia from environmental damage and desiccation until the spores are ready to be released. 2. Amphiphloeic siphonostele develops in rhizome of: Lycopodium Marsilea Equisetum Selaginella Explanation:An amphiphloeic siphonostele, which has phloem on both the inner and outer sides of the xylem, develops in the rhizome of Marsilea. This type of stele is characteristic of certain ferns. 3. Formation of gametophyte-like structure from sporophyte without reduction division is called (i.e., without formation of spores): Apogamy Apospory None of these Agametospermy Explanation:Apospory is the formation of a gametophyte-like structure directly from the sporophyte without undergoing meiosis and spore formation. This process bypasses the typical alternation of generations in the plant life cycle. 4. Biciliate antherozoids are found in which of the following? Rhizopus Spirogyra Selaginella and Lycopodium Pteris and Dryopteris Explanation:Biciliate antherozoids, which have two flagella, are found in Selaginella and Lycopodium. These flagella enable the antherozoids to swim towards the egg for fertilization. 5. The seedless plants which possess vascular tissues are: Pteridophyta Bryophyta Angiosperms Gymnosperms Explanation:Pteridophyta are seedless vascular plants, meaning they possess vascular tissues (xylem and phloem) for the transport of water and nutrients but do not produce seeds. Examples include ferns and horsetails. 6. A number of short stalked sporangia attached with placenta and covered by indusium is called: Sorus Ramenta Cone Sporophyll Explanation:A sorus is a cluster of sporangia (structures that produce spores) found on the underside of fern fronds. These clusters are often covered by a protective layer called the indusium. 7. Evidence in support of root-like nature of Selaginella rhizophore is: Root-like histology Absence of root cap All of the above Exogenous origin Explanation:The root-like nature of Selaginella rhizophores is supported by their histology, which resembles that of true roots. This includes structures such as vascular tissues arranged in a root-like pattern. 8. Psilotum is: A most primitive pteridophyte A living representative Both (a) and (b) Heterosporous form Explanation:Psilotum is both a living representative and one of the most primitive pteridophytes. It lacks true roots and leaves, resembling early vascular plants. 9. The sori of Dryopteris are covered by a thick multicellular covering known as: Ramenta Indusium Sclerenchyma Stele Explanation:In Dryopteris, the sori are protected by a thick, multicellular covering called the indusium. This protective layer helps shield the developing sporangia from environmental damage until the spores are ready to be released. 10. The megaspore of Selaginella on germination produces: Female prothallus Female gamete Male prothallus Female gametangium Explanation:Upon germination, the megaspore of Selaginella produces a female prothallus. This structure contains the archegonia, which generate the female gametes necessary for fertilization. Loading …
