Fragmentation is a method of asexual repoduction in
(1) Annelida
(2) Platyhelminthes
(3) Aschelminthes
(4) Porifera
Hermaphroditism is found in which phyla?
(1) Ctenophora
(2) Platyhelminthes
(3) Porifera
(4) All of these.
Which of the following is not true about Porifera
1.Cellular level of organisation
2.Radial symmetry
3.Tissue is absent
4.Canal system is present
The minute pores in the body wall of the sponges is known as
1.spongocoel
2.Ostia
3.Osculum
4.Spicules
Water canal is lined by
1. Spongin fibres
2. Choanocytes
3. Collar cells
4. Both 2 and 3
Canal system in sponges helps in
1. Food gathering
2. Respiratory exchange
3. Removal of waste
4. All of the above
In sponges, digestion is
1.Intercellular
2.Intracellular
3.Both inter and inter cellular
4.Gastric cavity
The mode of reproduction in sponges is
1.Sexual
2.Asexual
3.Both 1 and 2
4.None of these
Which of the following is true about sponges except
1.Sponges are hermaphrodite
2.Fertilisation is internal
3.Development is direct
4.Primitive multicellular animals
Which of the following is true about the given organism?
1.It is a medusa form of Aurelia
2.It is Fresh water sponge
3.Central canal system is present in it
4.It’s mouth is formed first