Question

Write the main characteristics of phylum Porifera and Aves give

one example of each with its diagram​

Answer 1

Answer:

Body wall is triploblastic. ❱ Notochord is present in the Embryo. ... Body is divided into head Thorax & abdomen. ❱

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Answer 2

Answer:

• Characteristic Features of Phylum Porifera:

1. They are generally marine aquatic organisms, with a few freshwater species.
2. Their bodies are asymmetrical.
3. Body shape can be cylindrical, vase-like, rounded or sac-like.
4. They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer. There is a gelatinous, non-cellular mesoglea, in between these two layers. This contains many free amoeboid cells.
5. The body has many pores called the ostia and a single large opening called osculum at the top.
6. Spongocoel is the body cavity that is present.
7. They have the characteristic canal system for the flow of water through the body.
8. Sense organs are absent.
9. There is an endoskeleton present with calcareous spicules (calcium carbonate) or siliceous spicules (silica) or sponging fibres (protein).
10. Sexes are not separate.
11. Asexual reproduction is seen through budding, fragmentation. Sexual reproduction is seen in certain species, through gametic fusion.

Examples

Spongilla_lacustris-Porifera

Sycon (Scypha)

Spongilla (Freshwater sponge)

Euspongia (Bath sponge)

• characterustics features of class Aves include:

1) They are known as birds.

2) They are warm-blooded animals with feathers.

3) Body is divided into head, neck, trunk, and tail.

4) Limbs are paired. Forelimbs usually modified for flying. The foot is with four toes.

5) They do not have sweat glands.

6) Oil glands are present at the base of the tail.

7) Pinna of the ear is rudimentary.

8) They have the fully ossified skeleton with air cavities.

9) Each jaw covered with a beak.

Examples: Doves, pigeons, falcons, ducks, sparrow, flamingo.