The development of the sporophyte without fertilization from the gametophytic tissue in some pteridophytes like Dryopteris is known as:
Apospory
Parthenogenesis
Apomixis
Apogamy
Related Questions
Read the following statements and choose the option which is true for them
a) Dryopteris is horsetail b) Selaginella is heterosporous
c) Salvinia is aquatic plant
a and b only
b and c only
a and c only
a, b and c
The development of the zygote into a young embryo within the female gametophyte is a characteristic of:
Seed plants
Seedless vascular plants
Bryophytes
Green algae
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.
Identify the heterosporous pteridophytes from the following options.
Salvinia and Selaginella
Dryopteris and Pteris
Psilotum and Tmesipteris
Lycopodium and Equisetum
The dominant photosynthetic phase in the life cycle of a Pteridophyte is the:
Gametophyte
Sporophyte
Prothallus
Sporophyll
Pteridophytes are predominantly:
Homosporous
Heterosporous
Both homosporous and heterosporous
Neither homosporous nor heterosporous
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
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 unique characteristic distinguishes the Selaginella stem anatomy from other pteridophytes?
Siphonostele
Protostele
Presence of trabeculae
Dictyostele
In pteridophytes, spores are produced in:
Antheridia
Archegonia
Sporangia
Rhizoids
