Explain the evolutionary significance of the presence of cellular layers in Porifera despite their lack of true tissues. How does this relate to the potential for more complex body plans in other animal phyla?
The cellular layers in Porifera are analogous to plant tissues, suggesting a common ancestor.
The lack of true tissues limits their complexity, preventing further evolutionary development.
The cellular layers are simply an artifact of their aquatic environment and have no evolutionary significance.
The distinct cell layers, though not forming true tissues, represent a step towards tissue-level organization, foreshadowing the more complex tissue development observed in Eumetazoa.
Related Questions
Engulfing of food either in solid or liquid is called
Sporozoic nutrition
Holozoic nutrition
Parasitic nutrition
Saprophytic nutrition
Which of the following cell types is capable of giving rise to other cell types in sponges?
Thesocytes
Pinacocytes
Cnidocytes
Archaeocytes
Which of the following is the characteristic canal system found in sponges belonging to the class Calcarea?
Asconoid
Syconoid
Leuconoid
Rhagon
Sponges are most accurately described as
Marine predators
Freshwater Scavengers
Aquatic filter feeders
Aquatic predators
The internal buds of freshwater sponges are otherwise called.
Choanocyte
Gemmule
Osculum
Blastula
The skeletal framework of sponges is made up of:
Spicules and spongin fibers
Chitin
Calcium carbonate only
Silica only
In phylum-Porifera opening through which water leaves the spongocoel is called
Ostia
Omadidia
Osculum
Choanocytes
Canal system in Porifera is not concerned with
Feeding
Respiration
Excretion
Locomotion
Which of the following is true about sponges?
Intercellular digestion
Direct development
Internal fertilization
Metagenesis
Water enter into spongocoel through
Osculum
Choanocytes
Ostia
Madreporite
