Quiz_Ptridophyta December 8, 2024 by Vijay Wardhan 1. Male gametophyte of Selaginella is found: Within the microspore Outside the microspore Partially inside the microspore Partially outside the microspore Explanation:The male gametophyte of Selaginella develops within the microspore. This enclosed development provides protection and ensures that the male gametes are produced in a controlled environment. 2. 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. 3. . In Bryophytes and Pteridophytes, transport of male gametes requires: (NEET 2016) Insects Wind Water Birds Explanation:In Bryophytes and Pteridophytes, the transport of male gametes requires water. The sperm cells are motile and swim through water to reach the female gametes for fertilization. 4. The development of Selaginella embryo is: Discoblastic Holoblastic None of these Meroblastic Explanation:The development of the Selaginella embryo is meroblastic, meaning that only a part of the egg undergoes cleavage. This type of development is typical in organisms with large yolky eggs. 5. The term stele was given by: Douliot Van Tiegham Van Tiegham and Douliot Nageli Explanation:The term “stele” was introduced by Van Tiegham and Douliot to describe the central vascular cylinder in plants. This concept is fundamental in understanding the vascular organization of plant stems and roots. 6. If the sporangia in a sorus are in different stages of development and are intermixed, this condition is called: Gradate sorus Simple sorus None of these Mixed sorus Explanation:A mixed sorus is a condition where the sporangia within a sorus are at different stages of development and are intermixed. This arrangement can be advantageous for the staggered release of spores. 7. The ferns are usually found: In marshy place Near marshy places In dry climate In shady, cool and moist places Explanation:Ferns thrive in environments that provide shade, cool temperatures, and moisture. These conditions are ideal for their growth and reproduction, as they require a moist habitat for the development of their gametophytes. 8. The heart-shaped prothallus of Dryopteris is always: Dioecious Monoecious Not certain Both monoecious and dioecious Explanation:The heart-shaped prothallus of Dryopteris is monoecious, meaning it contains both male and female sex organs (antheridia and archegonia) on the same individual. This allows for self-fertilization if necessary. 9. Azolla growing in paddy fields helps in: Bio-geochemical cycle Nitrogen fixation Mineral cycling Water absorption Explanation:Azolla, a small aquatic fern, helps in nitrogen fixation when grown in paddy fields. It harbors a symbiotic relationship with the cyanobacterium Anabaena, which fixes atmospheric nitrogen, enriching the soil. 10. The stem-like character of rhizophore of Selaginella is: Absence of root cap Exogenous origin Both (a) and (b) are correct Absence of nodes Explanation:Rhizophores in Selaginella exhibit stem-like characteristics such as exogenous origin (growing from the surface) and the absence of a root cap. These features distinguish them from true roots. Loading …
