Question

1. How many of the following are correct and incorrect about the characteristics of pore bearing animals
a) Mostly sessile but some are free swimming
b) A primitive network of nervous system present
c) Water canal system helps for defence, prey capture and anchorage
d) Hermaphrodites, sexual reproduction, internal fertilisation and indirect development
e) Remarkable power of regeneration
1) 2 are incorrect but 3 are correct
2) 3 are incorrect but 2 are correct
3) 4 are correct but 1 is incorrect
4) 4 are incorrect but 1 is correct​

Answer 1

Answer:

a.Sponges are sessile with no apparent way of capturing food or eliminating water.

Answer 2

Properties of pore bearing animals

Explanation:

Correct option:(1) 2 are incorrect but 3 are correct

Correct statement: (c), (d), and (e)

Incorrect statement: (a) and (b)

Pore bearing animals, also called as sponges, belong to phylum porifera of kingdom Animalia.

They are the most primitive heterotrophic organisms belonging to animal kingdom.

They have following properties:

1. They have marine habitat.
2. The adults of these class are sessile animals. These animals do not show any movement due to absence of flagella or cilia.
3. They do not have respiratory, digestive, reproductive or nervous system.
4. They are bisexuals (hermaphrodites), show sexual reproduction. Fertilization of gametes is internal.
5. Development of zygote is not via larva stage. Hence direct development is seen.
6. The characteristic feature of members of porifera is the presence of water canal system. This water canal system helps for defense, prey capture and anchorage.
7. Remarkable power of regeneration is seen due to presence of specialized cells called Archeocytes.