Phylum Porifera

Q. Canal system of porifera is not connected with

1. Nutrition
2. Sexual reproduction
3. Respiration
4. None of the above

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

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

Q.

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

1. Choanoderm

2. Pinacoderm

3. Cnidoblast

4. Mesohyl

Q.

Are Oysters osmoconformers?

Q. The Choanocytes in a syncoid type of sponge are present in

1. Radial canals
2. Excurrent canals
3. Spongocoel
4. Incurrent canals

Q. Reproductive cells present in gemmules are

1. Archaeocytes
2. Germ cells
3. Phagocytes
4. Chromocytes

Q. Totipotent cells of sponges are

1. Thesocytes
2. Archaeocytes
3. Myocytes
4. Chromocytes

Q. In Cnidarians, digestion occurs in the gastro-vascular cavity and then inside endodermal cells. In sponges, digestion takes place in

1. Paragastric cavity and choanocytes
2. Spongocoel and Food vacuoles
3. Choanocytes and Amoebocytes
4. Spongocoel and Amoebocytes

Q. Which cells are found exclusively in sponges?

1. Amoebocytes
2. Pigment cells
3. Nerve cells
4. Choanocytes

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

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

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.

phylum porifera

Q. The main body made of an aggregate of cells and internal cavities lined with food filtering flagellated cells are the characteristics of phylum:

1. Coelenterata
2. Porifera
3. Mollusca
4. Protozoa

Q. Which of the following is not true about reproduction in sponges?

1. Asexual reproduction by gemmules
2. Internal fertilization
   
3. Gametes production by epidermal cells
   
4. None of the above

Q. Assertion :In porifera, archaeocytes are totipotent. Reason: They give rise to all other types of cells.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

Q. Mycocytes of sponges show

1. Contractibility
2. Nervous excitation
3. All the above
4. Secretion of fibres

Q. Bath sponges are formed from

1. Euplectella
2. Dried spongin fibre skeleton
3. Skeleton of Spongilla
4. Dry Leucosolenia

Q. 'Venus Flower Basket' is the name of

1. Euspongia
2. Euplectella
3. Leucosolenia
4. Sycon

Q. Give a brief account on the canal system in sponges.

Q. In sponges, incurrent canals are externally lined by

1. Choanocytes
2. Porocytes
3. Pinacocytes
4. None of the above

Q. Which of the following is an animal that remains fixed at one place?

1. Amoeba
2. Sponge
3. Chlamydomonas
4. Hydra

Q. Body having meshwork of cells , internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of which of the following phylum?

1. Protozoa
2. Coelenterata
3. Porifera
4. Mollusca

Q. Collar cells of sponges are known as

1. Pinacocytes
2. Scleroblasts
3. Myocytes
4. Choanocytes

Q. Body skeleton of sponges are made of

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

Q. Best bath sponge comes from

1. Indian Ocean
2. Arabian Sea
3. Gulf of Mexico
4. Mediterranean Sea

Q. Sponges with skeleton of only spongin fibres occur in

1. Calcarea
2. Demospongiae
3. Hexactinellida
4. All the above

Q. Skeleton of sponge is

1. Ectodermal
2. Endodermal
3. Exoskeleton
4. Endoskeleton

Q. A common chamber in sponge is

1. Incurrent canal
2. Radial canal
3. Excurrent canals
4. Spongocoel

Q. Members of phylum Porifera are

1. Exclusively marine animals
2. Exclusively fresh water animals
3. Mostly marine animals but few are fresh water animals
4. Mostly fresh water animals but few are marine animals

Q. Water current in a sponge$/$Leucosolenia is maintained by

1. Pinacocytes
2. Choanocytes
3. Amoebocytes
4. Porocytes