Question

Botryoidal tissue is found in
A. Rabbit
B. Ascaris
C. Hirudinaria
D. Earthworm

Answer 1

Hint: Botryoidal tissues are made up of connective tissues that invade the coelom. It is commonly found in freshwater organisms belonging to the second largest phylum of the animal kingdom. It has some excretory functions and also provides protection to the organisms.

Complete answer:
Botryoidal tissue is a grape-like mass of cells that have a brown-pigment and performs the function of excretory cells. It is commonly found in the phylum Annelida. It contains two different types of cells; they are granular botryoidal cells and flattened endothelial cells. It has connective tissues that invade the coelom. The tissues undergo structural and functional modifications according to the needs of the organism. They are organized in chords and clusters which are sometimes surrounded by small lacunae. In the cytoplasm of the botryoidal cell, a large amount of calcium is stored. The cytoplasm is also filled with different sized granules containing melanin and iron. In response to wounding, the botryoidal cells change shape and size and form vessels. This tissue is commonly found in freshwater leeches known as Hirudinaria. The presence of this tissue makes the coelom appear as pseudocoelomate.

Hence, the correct answer is option C.

Note: Botryoidal tissue is commonly found in Hirudinaria which belongs to the phylum Annelida. They are sanguivorous in nature that is, it feeds on the blood. Its coelom is filled with the botryoidal tissues. Hirudinaria also has different types of biological cells that perform various functions.