Water Canal System

Q.

Lowest level of organization among eumetazoans:

1. Tissue level

2. Organ system level

3. Cellular level

4. Organ level

Q. Which of the following is not a primary function of the canal system in phylum Porifera?

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

Q.

The pathway of emerging and coming out of water in sponges is known as ______.

Q.

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

1. Ostia$\to$Osculum$\to$Spongocoel

2. Spongocoel$\to$Osculum$\to$Ostia

3. Ostia$\to$Spongocoel$\to$Osculum

4. Osculum$\to$Spongocoel$\to$Ostia

Q. Choanocytes perform

1. Excretion
2. Secretion of spicules
   
3. Reproduction
4. None of the above

Q. Which is the inhalant aperture in a sponge?

1. Osculum
2. Ostium
3. Prosopyle
4. Apopyle

Q.

Cellular totipotency is demonstrated by

1. Only bacterial cell

2. All eukaryotic cells

3. Only gymnosperm cell

4. All plant cells

Q. In most simple type of canal system of Porifera, water flows through which one of the following ways?

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

Q. Ostia are meant to

1. Digest food
2. Pass out water current
3. Excretes waste matter
4. Admit water current

Q.

Water circulation in sponges does not help in

1. locomotion

2. respiration

3. food gathering

4. removal of waste

Q. Choanocyte is present in an 'ascon type' of canal system. It lines

1. Porocyte
2. Incurrent
3. Apopyle
4. Spongocoel

Q. Whose figure is represented here?

1. A typical sponge
2. A typical canal system in sponge
3. A typical digestion pathway in sponge
4. Both B and C

Q. Water currents in Leucosolenia are produced by

1. Choanocytes
2. Pinacocytes
3. Archaeocytes
4. Thesocytes

Q.

Why does a liver piece is taken to analyze the biomolecules ?

Q. Which of the following gives the most appropriate meaning of choanocytes?

1. Excretory cells
2. Nutritive cells
3. Reproductive cells
4. Spicule forming cells

Q. A current of water enter ostia and reaches the sponge and then comes out through the oscula. This system is called as

1. Water vascular system
2. Bathing system
3. Circulatory system
4. Canal system

Q. Aperture between incurrent and flagellate canals of sponges is called.

1. Prosopyle
2. Spongocoel
3. Porocyte
4. Collencyte

Q. Which of the following cell of a sponge helps to maintain a water current in its body?

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

Q. In Poriferans, the spongocoel is lined with flagellated cells called

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

Q. In sponges, various types of body cells obtain nourishment from

1. Choanocytes
2. Trophocytes
3. Thesocytes
4. Both B and C

Q. Cells, which create water current and ingest food in Leucosolenia and other sponges is

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

Q. Spongocoel is also known as

1. Paragastric cavity
2. Water vascular cavity
3. Gastrovascular cavity
4. Coelenteron

Q. Sponges capture food particles with the help of

1. Choanocytes
2. Thesocytes
3. Trophocytes
4. Pinacocytes

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. Many sponges may be bigger than fishes, yet they do not have respiratory organs because they

1. Are sedentary
2. Have porous body
3. Respire anaerobically
4. Do not require them

Q. Digestion of food is completed in sponges in

1. Choanocytes
2. Trophocytes
3. Thesocytes
4. Phagocytes

Q. In sponges, there is

1. The symmetry is radial
2. A single exist and a number of mouths
3. Present a true coelom
4. A single mouth and a number of exist

Q. Power of regeneration in sponges is due to

1. Theocytes
2. Both of the above
3. Archaeocytes
4. Sclerocytes