Porifera

Porifera

 1.most important charateristcs of all sponges is

a.coelenteron

b.herbivorous nature

c.choanocyte

d.only sexual reproduction

Ans----> c

2.sponges are

a. pelagic                                      a. unicellular

b. free swimmimg                      b. multicellular

c. planktonic                                c. multicelular without tissue

d. sessile                                       d. multicellular with tissue

Ans----> d,c

3.organization in sponges is

a.protoplamic grade

b.cellular grade

c.organ grade

d.tissue grade

Ans----> b

4.members of phulum porifera  are

a.exclusively marine

b.exclusively fresh water

c.mostly freshwater but most are marine

d.mostly marine but few are fresh water

Ans----> d

5.special feature of sponges is

a.all are marine

b.water canal system

c.water vascular system

d.ambulacral system

Ans----> b

6.which of the following is found in porifera?

a.coelenteron

b.pseudocoel

c.gastrovascular cavity

d.paragastric cavity

Ans----> d

7.the spongocoel of the sponges is lined with

a.poroctye

b.choanocyte

c.amoebocyte

d.spicules

Ans----> b

8.Sponges have

a.Radial symmetry

b.Asymmetry

c.Both of them

d.none

Ans----> c

9.In sponges there is

a.Radial symmetry

b.A true coelom

c.a single exit and a number of mouthlets

d.a single mouthlet and a number of exits

Ans----> c

10.Digestion in sponges is

a.only intracellular

b.first intracellular and then extracellular

c.only extracellular

d.first extracellular then intracellular

Ans----> a

11. The chief nitrogenous waste of the sponges is

a.urea

b.ammonia

c.uric acid

c.carbondioxide

Ans----> b

12.flagellated cells which create water current and indigest food in Leucosolenia and other sponges are

a.Trophophyte

c.Pinacocyte

c.Choanocyte

d.Nematocyte

Ans----> d

13.The collar cells or choanocyte in the sponges are situated in

a.Mesenchyme

b.outer pinacoderm

c.Both a and b

d.inner choanoderm

Ans----> d

14.Cells not found in sponges are

a.porocyte

b.Mycocyte

c.cnidoblast

d.calcoblast

Ans----> c

15.The middle layer of the body wall of porifera is

a.Mesoderm

b.mesenchyme

c.mesoglea

d.mesentry

Ans----> b

16.totipotent cells capable of giving rise to other types of cells in sponges are

a.collencytes

b.pianocyte

c.archaeocyte

d.thesocyte

Ans----> c

17.The spicules forming in the sponges are

a.Choanocyte

b.pianocyte

c.porocyte

d.sclereoblast

Ans----> d

18.Sycon, Leucosolenia  belong to which class?

a.calcera

b.Hexactinellida

c.Demospongiae

d.None

Ans----> a

19.A fresh water sponge is

a.Spongilla

b.Euplectella

c.Sycon

d.Euspongia

Ans----> a

20. Boring sponge is

a.Cliona

b.Euplectella

c.Chalina

d.Hyalonnems

Ans----> a

21. Parenchymula is the larva of

a.hydra

b.Ascaris

c.Sycon

d.Leucosolenia

Ans----> d

23. The simplest type of canal system in porifera is

a.Sycon

b.Ascon

c.Leucon

d.Radial

Ans----> b

24. Fresh water sponges from the internal asexual products called are

a.Planula

b.buds

c.gemmule

d.branches

Ans----> c

25. the correct path of water in a sponges is

a.Ostia -  Apopyle – osculum – prosopyle

b.Ostia – Apopyle- prosopyle – osculum

c.ostia – prosopyle- apopyle – osculum

d.apopyle- ostia- prosopyle – osculum

Ans----> c

26. Leucosolenia is

a.Free living , solitary and marine

b.sessile, solitary and marine

c.sessile , colonial and marine

d.sessile, colonial and fresh water

Ans----> c

27. Reproduction cells in sponges probably form from

a.Archaeocyte

b.Pianocyte

c.Mycocyte

d.Scleroblast

Ans----> a