Water Canal System

Q.

What are ostia and osculum?

Q. Water canal system of sponge is responsible for all activities except:

1. Locomotion
2. Food capture
3. Respiration
4. Excretion

Q. The function of the water canal system in sponges are

1. food gathering and exchange of gases only
2. food gathering, removal of wastes and exchange of gases
3. food gathering and removal of wastes only
4. only removal of wastes and exchange of gases

Q. In case of poriferans, the spongocoel is lined with flagellated cells called

1. ostia
2. oscula
3. choanocytes
4. mesenchymal cells

Q. Porocytes are

1. located in the body of flatworms and are excretory in function
2. located in the body wall of sponge and regulates incoming water current
3. located in the body of roundworms and are excretory in function
4. located in the body of hydra and regulates the outgoing water current

Q. Choose the correct route of the flow of water inside a sponge.

1. Ostia $\to$ Spongocoel $\to$ Osculum $\to$ Exterior
2. Spongocoel $\to$ Ostia $\to$ Osculum $\to$ Exterior
3. Osculum $\to$ Spongocoel $\to$ Ostia $\to$ Exterior
4. Osculum $\to$ Ostia $\to$ Spongocoel $\to$ Exterior
   

Q.

In which phylum choanocytes are found?

Q. Choose the correct order of water pathway in sponges.

1. Spongocoel $\to$ Ostia ​​​​​​​$\to$ Osculum
2. Ostia $\to$ Spongocoel $\to$ Osculum
3. Ostia $\to$ Osculum $\to$ Spongocoel
4. Osculum $\to$ Ostia ​​​​​​​$\to$ Spongocoel

Q. All of the following statements are correct for Poriferans, except

1. They reproduce sexually as well as asexually
2. Eggs and sperms are produced by the same individual
3. They have an extracellular type of digestion
4. They are generally marine and mostly asymmetrical animals

Q.

Armour plates of dinoflagellates are made up of

1. cellulose

2. chitin

3. None of these

4. silica

Q.

How do jellyfish get oxygen?

Q. ntshow the diagrammatic sectional view of body wall of leucon type canal system in sponges showing all the features (excurrent canal , prosopyles, ostia, flagellated chambers , apopyles ) clearlyn ntn

Q.

What Is The Lateral Line System Composed Of?

Q. The correct flow of water current in sponges is

1. ostia → osculum → spongocoel → outside
   
2. osculum → spongocoel → ostia → outside
   
3. ostia → spongocoel → osculum → outside
   
4. osculum → ostia → spongocoel → outside

Q. The function of the water canal system in sponges are

1. food gathering and exchange of gases only
2. food gathering, removal of wastes and exchange of gases
3. food gathering and removal of wastes only
4. only removal of wastes and exchange of gases

Q.

Water circulation in sponges does not help in

1. locomotion

2. respiration

3. food gathering

4. removal of waste

Q. This question consists of two statements, Assertion and Reason.

While answering this question you are required to choose any one of the following five responses.

Assertion: Sponges belong to Porifera.

Reason: Sponges have canal system.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If the assertion is false but the reason is true.
3. If both assertion and reason are false.
4. If assertion is true but reason is false.
5. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Q. Collar cells are also called

1. Pinacocytes.
2. Amoebocytes
3. Choanocytes
4. Flame cells

Q. Water current in Leucosolenia is produced by

1. archaeocytes
2. collencytes
3. choanocytes
4. pinacocytes

Q.

Are sponges asexual?

Q. Which organism given below has a shell?

1. Cucumaria
2. Ophiura
3. Octopus
4. Pinctada

Q.

What is the buccal segment of an earthworm called?

Q. Blue copper protein complex contained in some molluscs 1n their plasma for oxygen transport is

Q.

Write True or False:​

​Water vascular system is present in sponges.​

Q.

In the water canal system of poriferans, the pathway for water flow is

1. Ostia➔Osculum➔Spongocoel

2. Spongocoel➔ Osculum➔Ostia

3. Ostia➔Spongocoel ➔Osculum

4. Osculum➔Spongocoel➔Ostia

Q.

Name the following:

a) Cavity present in the body of sponges.

b) Cavity present in the body of cnidarians.

Q. Sort the route taken by water into and out of the body of a sponge.

1. Spongocoel
2. Ostia
3. Out of the body
4. Osculum

Q. Assertion :Sponges exhibit cellular level of organisation. Reason: In sponges, cells are arranged as loose cell aggregates.

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. Both Assertion and Reason are incorrect

Q.

What are choanocytes?

Q. ntwhy gill slits are present in pharynx in chordates.n