Consider the following characteristics of Porifers. Which of these can be regarded as synapomorphies of Porifera?
| 1. | Collared cells called as choanocytes |
| 2. | Canal system with pores (ostia) in body wall |
| 3. | Mineral spicules |
| 4. | High cellular mobility and totipotency |
In case of poriferans, the spongocoel is lined with flagellated cells called
1. ostia
2. oscula
3. choanocytes
4. mesenchymal cells
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
| 1. | Penguin is homeothermic while the remaining three are poikilothermic |
| 2. | leech is a fresh water form while all others are marine |
| 3. | Spongilla has special collared cells called choanocytes, not found in the remaining three |
| 4. | All are bilaterally symmetrical |
Body having meshwork of cells, internal cavities lined with food filtering flagellated cells
and indirect development are the characteristics of phylum
1. Coelenterata
2. Porifera
3. Mollusca
4. Protozoa
Pick the odd pair out.
(1) Porifera : choanoflagellates
(2) Cnidaria : nematocysts
(3) Nematoda : pseudocoelom
(4) Mollusca : torsion
Which of the following have porous body and have Cellular Level of Organization?
(1) Aurelia and Obelia
(2) Adamsia and Euplectella
(3) Leucosolenia and Spongilla
(4) Sycon and Hydra
Gemmule formation is a common mode of asexual reproduction in
(1) Paramecium
(2) Hydra
(3) sponges
(4) yeast
Water transport system or canal system is a characteristic feature of which animal?
1. Spongilla
2. Hydra
3. Asterias
4. Echinus
Collar cells are present in the members of which phyla
1. Echinodermata
2. Coelenterata
3. Ctenophora
4. Porifera
© 2026 GoodEd Technologies Pvt. Ltd.