Phylum Porifera

Q.

Is Porifera radial symmetry?

Q.

Why are Sponges said to be the simplest group of multicellular organisms?

Q.

How do sponges get their food?

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

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

Q.

How is metazoan classified?

Q.

Are sponges triploblastic?

Q. From the following statements select the wrong one:

1. Prawn has two pairs of antennae
2. Millipedes have two pairs of appendages in each segment of the body
3. Animals belonging to phylum Porifera are exclusively marine
4. Nematocysts are characteristic of the phylum cnidaria

Q.

Where are Ostia found?

Q.

The term ‘shell fish’ includes

1. Prawns and Molluscs

2. Bony fish and Cartilaginous fish

3. Cuttle fish and Star fish

4. Jelly fish and Sea anemones

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

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

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

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

Q. Choanocytes help in

1. capturing food
2. locomotion
3. respiration
4. body support

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. Ctenophora

4. Cnidaria

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

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

Q. Gemmule formation in sponges is associated with

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

Q.

The "packing" tissue found in porifera is called _________.

1. Choanoderm

2. Pinacoderm

3. Cnidoblast

4. Mesohyl

Q.

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

1. Cellular level of organisation

2. Presence of ostia

3. Body supported externally by cuticle

4. Intracellular digestion

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

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

Q.

Common bath sponge is:

1. Euplectella

2. Spongilla

3. Syon

4. Euspongia

Q. Which of the following is incorrect for phylum Porifera?

1. Digestion is intracellular
2. Sexes are separate
3. Fertilisation is internal
4. Development is indirect

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. Euplectella
3. Hydra
4. Oniscus

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.

The organisms having mesoglea lack________

1. Gastro vascular cavity

2. Tissues

3. Intracellular digestion

4. Nervous system

Q. From the following statements select the wrong one:

1. Prawn has two pairs of antennae
2. Millipedes have two pairs of appendages in each segment of the body
3. Animals belonging to phylum Porifera are exclusively marine
4. Nematocysts are characteristic of the phylum cnidaria

Q. Water comes out through _____, once it enters into the spongocoel through minute pores called ostia in sponges.

1. Osculum
2. Operculum
3. Hypostome
4. Cloaca