Question
Selaginella and Salvinia are considered to represent a significant step towards the evolution of seed habit because:
Embryo develops in female gametophyte which is retained on parent sporophyte.
Female gametophyte is free and gets dispersed like seeds.
Female gametophyte lacks archegonia.
Megaspores possess endosperm and embryo surrounded by a seed coat.
in heterosporous pteridophytes like Selaginella and Salvinia, the female gametophytes are retained on the parent sporophytes for variable periods. The development of the zygotes into young embryos takes place within the female gametophytes. This event is considered a precursor to the seed habit and is an important step in evolution .
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Plant Kingdom. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
More Plant Kingdom Questions
From an evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in:
Which one of the following is the characteristic feature of gymnosperms?
Which of the following is incorrectly matched?
Match the plant with the kind of life cycle it exhibits: List-I (a) Spirogyra (b) Fern (c) Funaria (d) Cycas List-II (i) Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte (ii) Dominant haploid free-living gametophyte (iii) Dominant diploid sporophyte alternating with reduced gametophyte called prothallus (iv) Dominant haploid leafy gametophyte alternating with partially dependent multicellular sporophyte
Given are the following five statements (I - V) for your consideration: I: In Equisetum, the female gametophyte is retained on the parent sporophyte II: In Ginkgo, the male gametophyte is not independent III: The sporophyte in Marchantia is more developed than that in Polytrichum IV: Sexual reproduction in Volvox is isogamous V: The spores of slime moulds lack cell walls How many of the above statements is/are correct?
Match List-I with List-II: List-I A. Pteridophyte B. Bryophyte C. Angiosperm D. Gymnosperm List-II I. Salvia II. Ginkgo III. Polystrichum (Polytrichum) IV. Salvinia
A prokaryotic autotrophic nitrogen-fixing symbiont is found in:
Examine the figure given below and select the right option giving all the four parts (A, B, C and D) correctly identified:
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