Give characters of Porifera. Mesoderm only lining ectoderm but not digestive tra

Question

Give characters of Porifera. Mesoderm only lining ectoderm but not digestive tract A) acoelornate B) coelomate C) pseudocoelomate D) all of these Sponges feed with special cells A) cnidocytes B) amoebocytes C) fibrocytes D) choanocytes Distinguish between protostome and deuterostome development Animal having bell shaped body with tentacles, gastrovascular cavity divided into canals A) Obelia B) sea anemone c) moon jelly D) Hydra Cnidarians surround them with lime and look rock like A) jellies B) hydrozoans C) flat worms D) corals Animal with a float, tentacles, specialized polyps for capturing food A) jelly fish B) Physalia C) Obella D) Squid Distinguish between 2 types of symmetry in animals and give significance for each. How do cnidocytes help in survival? In glass sponges spicules are made of - and -rayed Draw the phylogenetic tree for animals and give its significance.

Explanation / Answer

Answer:

1.

Charecteristics of porifera:

a. They are marine.

b. They are commonly called sponges

c. They are multicellular organisms, which are sedentary.

c. They show symmetrical or radial symmetry.

2. C). Pseudocoelomate

3). D). Choanocyts

Endoderm consists of collar cells or choanocytes and forms the lining of flagellated chambers. The choanocytes or collar cells will filter the water and-catch the prey. They digest the food. They are nutritive cells.

4. During embyogenesis, blastopore first develops into mouth in protostomes whereas blastopore develops into anal opening in deuterostomes.

5. C). Moon jelly

The jellyfish can be recognized by its four horseshoe-shaped gonads, easily seen through the top of the bell. It feeds by collecting medusae, plankton, and mollusks with its tentacles, and bringing them into its body for digestion.

6). D). Corals

Corals live in colonies and build coral reefs (Rock like structures that forms coral skeletons).

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