Which of these characteristics is NOT associated with the evolution of heterospory in pteridophytes?
Reduction in the number of megaspores
Increased protection of the female gametophyte
Development of endosporic gametophytes
Increased dependence on water for fertilization
Related Questions
Which unique characteristic distinguishes the Selaginella stem anatomy from other pteridophytes?
Siphonostele
Protostele
Presence of trabeculae
Dictyostele
In heterosporous pteridophytes, the development of the male gametophyte predominantly occurs:
Within the megaspore wall
Outside the spore wall
Partially inside and outside the spore wall
Within the microspore wall
Which of these pteridophyte genera are known for heterospory?
Selaginella and Salvinia
Lycopodium and Psilotum
Equisetum and Dryopteris
Marsilea and Azolla
Explain the role of the annulus in fern sporangia, contrasting its function with the role of elaters in liverworts.
Both annulus and elaters aid in nutrient absorption.
The annulus protects the developing spores, while elaters facilitate fertilization.
The annulus aids in spore dispersal in ferns by a spring-like mechanism, while elaters in liverworts are hygroscopic and facilitate spore dispersal by changing shape with humidity.
Both annulus and elaters are involved in anchoring the plant to the substrate.
Which of these characteristics is NOT associated with the evolution of heterospory in pteridophytes?
Reduction in the number of megaspores
Increased protection of the female gametophyte
Development of endosporic gametophytes
Increased dependence on water for fertilization
Which structure represents the first stage of the gametophyte generation in the moss life cycle, developing directly from a germinated spore?
Protonema
Capsule
Sporophyte
Gametophore
The suspensor in Selaginella plays a crucial role in:
Anchoring the gametophyte to the substrate
Protecting the developing sporophyte
Facilitating spore dispersal
Pushing the developing embryo into the nutritive tissue of the female gametophyte
Which of the following represents a heterosporous pteridophyte?
Selaginella and Salvinia
Psilotum and Lycopodium
Equisetum and Dryopteris
Adiantum and Pteris
What is the immediate product of spore germination in the moss life cycle?
Capsule
Protonema
Sporophyte
Rhizoid
In the life cycle of mosses, the spore directly develops into a branched, filamentous structure called:
Prothallus
Protonema
Sporangium
Antheridium
