Quiz_Ptridophyta December 8, 2024 by Vijay Wardhan 1. Selaginella differs from Moss in having: Swimming antherozoids Well developed vascular system Archegonia An independent gametophyte Explanation:Selaginella has a well-developed vascular system, which includes xylem and phloem for efficient transport of water and nutrients. This is a key difference from mosses, which lack such vascular tissues and rely on diffusion for nutrient transport. 2. The number of androcytes in male prothallus of Selaginella are: 128 64 None of these 256 Explanation:The male prothallus of Selaginella typically contains 256 androcytes, which are cells that develop into sperm cells. This large number ensures successful fertilization by increasing the chances of sperm reaching the egg. 3. Fern prothallus is: Heterothallic Homothallic Dioecious Heterotrophic Explanation:The fern prothallus is homothallic, meaning it contains both male and female sex organs (antheridia and archegonia) on the same individual. This allows for the possibility of self-fertilization. 4. In Pteris, the roots are: Adventitious (fibrous) roots Tap roots Coralloid Rhizoids Explanation:In Pteris, a type of fern, the roots are adventitious, meaning they arise from non-root tissues such as stems or leaves. These fibrous roots help the plant anchor itself and absorb nutrients and water from the soil. 5. Rhizophore of Selaginella is: Stem Root None of the above ‘Organ sui-generis’ Explanation:The rhizophore of Selaginella is considered an ‘organ sui-generis,’ meaning it is a unique structure that combines characteristics of both roots and stems. It helps in anchoring the plant and absorbing nutrients. 6. 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. 7. In pteridophytes, meiosis occurs at the stage of: Gamete formation Spore formation Any of the above is possible Prothallus formation Explanation:In pteridophytes, meiosis occurs during spore formation. This process reduces the chromosome number by half, resulting in haploid spores that will develop into gametophytes. 8. . Tapetum develops in: Leptosporangiate sporangia Eusporangiate sporangia None of the above Sporogonia Explanation:The tapetum is a nutritive tissue that develops in eusporangiate sporangia. It provides nutrients to the developing spores. 9. The structure produced from germination of a microspore of Selaginella is: Gemma Gametangia Female gametophyte Male gametophyte Explanation:Upon germination, a microspore of Selaginella develops into a male gametophyte. This structure produces antheridia, which generate the male gametes necessary for fertilization. 10. attract the antherozoids of Funaria towards their archegonium: Malic acid only Mucilage Sugars Mucilage and malic acid Explanation:Sugars released by the archegonia of Funaria attract antherozoids (sperm cells) towards them. This chemotactic response ensures that the sperm cells reach the eggs for fertilization. Loading …
