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In some algae, the pyrenoids are surrounded by a sheath of starch plates. This characteristic is primarily found in:
Phaeophyta
Rhodophyta
Chlorophyta
Cyanobacteria
The mannitol is the stored food material of which group of algae?
Chlorophyta
Rhodophyta
Phaeophyta (Brown algae)
Cyanobacteria
Which specific phycocolloid found in Rhodophyceae contributes significantly to its characteristic red color and exhibits fluorescence?
Phycocyanin
Phycoerythrin
Carrageenan
Fucoxanthin
In the life cycle of Polysiphonia, a complex Rhodophycean alga, what unique characteristic distinguishes it from most other algal groups?
Presence of a dominant sporophyte generation
Lack of motile gametes
Three multicellular phases: carposporophyte, tetrasporophyte, and gametophyte
Production of non-motile spores
The unique pit connections found between adjacent cells in Rhodophyceae are primarily composed of what material?
Protein
Cellulose
Silica
Calcium Carbonate
Which of the following features is NOT characteristic of floridean starch, the storage carbohydrate found in Rhodophycea?
Branched structure similar to amylopectin
Stored in the cytoplasm
Amylose with ฮฑ-1,4 linkages
Absence of plastids within the pyrenoids
In the complex life cycle of certain Rhodophyceae, like Polysiphonia, the carposporophyte develops directly from which structure?
Carpogonium
Tetrasporophyte
Zygote
Spermatium
Which specific characteristic of Rhodophycean cell walls contributes significantly to their flexibility and allows them to withstand strong water currents?
High cellulose content
Presence of lignin
Sulfated galactans like agar and carrageenan
Deposition of silica
Which specific characteristic of Selaginella leads to its classification as a heterosporous pteridophyte?
Presence of rhizophores
Production of megaspores and microspores within the same strobilus
Homosporous nature with a single type of spore
Lack of a distinct strobilus
The development of the suspensor in Selaginella is attributed to which part of the embryo?
Epibasal tier
Hypobasal tier
Both epibasal and hypobasal tiers
The megaspore itself