Lecture 2-3-4 Flashcards
How does the ‘alteration of generations’ apply to thalloid bryophytes?
- They are haploid prominent. Sexual and asexual reproduction.
What are the three classes of Bryophytes? And what is their predominant generation?
They are Liverworts, Hornworts, and Mosses. The predominant generation is haploid gametophyte.
What differentiates a moss from a thalloid bryophyte?
Physically a moss lack a thallus and therefore does not have as much of a ‘leafy’ appearance.
What is a thallus?
The vegetative tissue of some organisms like bryophytes.
What are Gemmae?
They are asexual propagules formed inside specialized structures (Gemmae cups).
What are the specialized tissues for water and food conduction that evolved in the mosses?
Xylem and Phloem.
What is the Protonemata?
A thread-like chain of cells that develops from a spore and creates a leafy gametophore.
What features distinguish Hornworts from other Bryophytes?
Each of their cells only contain a single large chloroplast.
What are Lycophytes?
Land plants with lateral sporangia and exarch protosteles.
What is the major evolutionary change observed in Lycophytes?
The evolutionary change observed in Lycophytes is microphylls.
What is Homospory?
The formation of spores that are similar in shape and size.
What is Heterospory?
The production of spores of two different sizes and sexes by the sporophytes of land plants. The smaller, the microspore, is male and the larger, the megaspore, is female.
