Phylum Porifera

Q.

Give an example of an animal having canal system.

Q. are the cells that line the spongocoel of the sponges.

1. Sporocytes
2. Flame cells
3. Choanocytes
4. Oocytes

Q. Gemmule formation in sponges is associated with

1. parthenocarpy
2. asexual reproduction
3. parthenogenesis
4. sexual reproduction

Q. Assertion (A): Sponges have cellular level of body organization

Reason (R): There is some physiological division of labour

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A and R are false

Q. Which statement is incorrect about members of phylum Porifera?

1. Have cellular level of organisation
2. Have separate sexes
3. Sexual reproduction takes place by gamete formation
4. Have a water canal system

Q.

The organisms having mesoglea lack________

1. Gastro vascular cavity
2. Tissues
3. Intracellular digestion
4. Nervous system

Q.

What are pore-bearing animals?

Q.

What is the function of Mesohyl?

Q. Which of these is referred to as 'Venus flower basket'?

1. Spongilla
2. Sycon
3. Euplectella
4. Cliona

Q.

What is the common asexual reproductive structure in sponges?

Q. Spongocoel is lined with flagellated cells called:

1. Ostia
2. Oscula
3. Choanocytes
4. Mesenchymal cells

Q. Which animals are known for cellular level of body organisation?

1. Sponges
2. Annelids
3. Echinoderms
4. Protozoans

Q.

Which sponge body type is most efficient?

Q. Body skeleton of sponges are made of

1. collar cells
2. ostia
3. spongocoel
4. spicules

Q. The internal buds of freshwater sponges which can survive unfavourable conditions are called

1. ostia
2. choanocytes
3. gemmules
4. oscula

Q. Sycon and Euspongia are marine sponges, while Spongilla is a freshwater sponge.

1. False
2. True

Q.

Is a sponge unicellular or multicellular?

Q.

The sponge which is generally gifted in marriages by the Japanese is _______.

Q.

Which one of these is not a characteristic feature of sponges?

1. Presence of ostia

2. Cellular level of organisation

3. Intracellular digestion

4. Body supported with cuticle

Q. Mark the false statement for the phylum Annelida.

1. They are bilaterally symmetrical, coelomate animals
2. They have both monoecious and dioecious animal representatives.
3. Excretory system consists of flame cells
4. They do not have asexual reproduction

Q. Organism X has a cylindrical and curved body with thin walls. It is found attached by its siliceous roots to the bottom of the deep sea near the Philippines. The skeleton of X is a costly marriage gift in Japan. Identify X.

1. Sycon
2. Hydra
3. Euplectella
4. Oniscus

Q.

The animals which are exclusively aquatic, sessile, with cellular level of organisation of the body are placed in phylum _____

1. Protozoa

2. Porifera

3. Cnidaria

4. Ctenophora

Q. Sycon belongs to a group of animals, which are best described as:

1. Multicellular having tissue organization but not a body cavity
2. Unicellular or acellular
3. Multicellular without any tissue organization
4. Multicellular with a gastro-vascular cavity

Q.

Which canal system is the most efficient?

Q.

Polyp phase is absent in:

1. Hydra

2. Aurelia

3. Obelia

4. Physalia

Q.

Can sponges reproduce sexually?

Q. Which of the following is called bath sponge?

1. Sycon
2. Scypha
3. Spongilla
4. Euspongia

Q. Which of the following statements are true/false?
I. In higher phyla, cellular level of organisation is present.
II. Phylum Platyhelminthes is characterised by cellular level of organisation.
III. Cellular level of organisation is seen when the cells are not arranged as loose cell aggregates.
IV. Molluscs exhibit tissue level of organisation.

1. I and II are true, but Ill and IV are false
2. All statements are false
3. All statements are true
4. Ill and IV are true, but I and II are false

Q.

Name the cells which line the spongocoel.

Q. Choanocytes form the lining of the para-gastral cavity in

1. jellyfish
2. sponges
3. flatworms
4. starfish