Question

The gemmule formation is the form of asexual reproduction in the class of:
A. Calcarea
B. Demaspongiae
C. Both A and B
D. None of the above

Answer 1

Hint: Gemmules are impervious to drying up (drying out), freezing, and anoxia (absence of oxygen) and can lie around for significant periods. Gemmules are like a bacterium’s endospore and are composed of amoebocytes encompassed by a layer of spicules and can endure conditions that would execute grown-up wipes.

Step by step answer:Gemmules are interior asexual buds for agamic proliferation found in wipes, that are fit for forming into another living being i.e., a grown-up wipe. In gemmules, an inward layer of amoebocytes is encircled by a layer of collagen (spongin) that might be strengthened by spicules. The Demospongiae and Calcarea are the class in the phylum Porifera (sponges). Accordingly, the right answer is choice C.
-The phylum Porifera is partitioned into four late classes: Hexactinellida, Demospongiae,
Calcarea, and Homoscleromorpha. The gemmules are found in both Calcareaand Demospongiae.
-Gemmules are inward buds found in wipes and are associated with abiogenetic propagation. It
is an agamically repeated mass of cells, that is equipped for forming into another living being
i.e., a grown-up wipe.
-Gemmules are equipped for connecting to a base and creating another wipe. Since gemmules
can withstand unforgiving conditions, are impervious to parching, and stay torpid for significant
stretches, they are brilliant methods for colonization for a sessile life form.
Hence, option C is correct

Note: Gemmules are naturally safe structures created by grown-up wipes wherein the average wipe morphology is upset. In gemmules, an inward layer of amoebocytes is encircled by a layer of collagen (spongin) that might be strengthened by spicules. The collagen that is regularly found in the mesohyl turns into the external defensive layer. In freshwater wipes, gemmules may endure antagonistic
ecological conditions, for example, temperature changes. They serve to recolonize the living space once
natural conditions settle.