Question

A. Symmetry of ctenophorans	1. Haeckelia
B. Ctenophora with nematocyst	2. Radial
C. Habitat of comb jellies	3. Colloblast
D. Specialised cells of comb jellies	4. Marine

• A. A- 3, B- 4, C- 2, D- 1
• B. A- 4, B- 3, C- 2, D- 1
• C. A- 1, B- 2, C- 3, D- 4
• D. A- 2, B- 1, C- 4, D- 3

Answer 1

The correct option is D A- 2, B- 1, C- 4, D- 3

The ctenophores have radial symmetry. They have elongated and tubular body. They are attached to the substratum by on end. The other end has an opening called as mouth which is surrounded by long tentacles. Thus, the symmetry of these organism are called as biradial symmetry.

Species of Haeckelia are known to carry nematocysts on their medusae. They carry the nematocysts on their tentacles. There are nematocysts which are arranged on the medusae.

Habitat of comb jellies is marine waters. They can survive in shallow waters as well as in depth. Some of the species are found near the water surface.

Specialised cells are present in comb jellies which are known as colloblasts. These are sticky type of cells and adhere to the prey. This helps in capturing the prey as these organisms lack the stinging cells.

Thus, the correct answer is option D.