Question

Botryoidal tissue is found in
A. Porifera
B. Acanthocephala
C. Annelida
D. Echinodermata

Answer 1

Hint: In Hirudinea (which are a member of Annelida) the coelom is much reduced due to filling by botryoidal tissues, and forms haemocoelomic sinuses. They are hermaphrodites with one male and one female gonopore.

Complete Answer:
- The botryoidal tissue is made up of two different types of cell such as flattened endothelial like cells and granular botryoidal cells which are located in the soft connective tissue among the body wall sac and guts in leeches.
- The botryoidal tissue goes through functional and structural changes due to the different needs developing during the life cycle of the animal.
- Botryoidal cells are aligned in cords or clusters, occasionally enclosing few, small lacunae in mature untreated leeches.
- Again, in unhealthy, injured animals; there occurs change of the botryoidal tissue from cluster/cord like forms to a hollow/tubular structure, representing pre-vascular structures.
- In leeches of phylum Annelida, the botryoidal tissue is composed of two different cell types, granular botryoidal cells and flattened endothelial-like cells containing a brown pigment and may serve an excretory function.

Thus, the correct option is C i.e. Annelida.

Note: Botryoidal tissue is present in Hirudinaria, which is a member of phylum Annelida and by nature and its characteristic traits it is specified as a sanguivorous that is one which feeds on blood. Hirudinaria is well known to have botryoidal tissue and the coelom which is filled with this tissue.