Exchange of Gases in Fishes

Q.

Which of the following represents the countercurrent mechanism in fish?

1. 1

2. 2

3. 1 and 2

4. None of the above

Q.

Which of the following represents the countercurrent mechanism in fish?

1. 1

2. 2

3. 1 and 2

4. None of the above

Q.

Fish breathe through-

1. Lungs

2. Stomata

3. Gills

4. Skin

Q. In echinoderms, the organs of gaseous exchange are

1. tube feet
2. trachea
3. book lungs
4. book gills

Q. Match column I with column II and select the correct option from the codes given below:

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ A& \text{Trachea}& \left(i\right)& \text{Alveolar air pO}{}_2\\ B& \text{Respiratory centre}& \left(ii\right)& \text{ATP}\\ C& \text{Yeast}& \left(iii\right)& \text{Catilaginous rings}\\ D& \text{Insects}& \left(iv\right)& \text{Medulla region}\\ E& \text{Fish}& \left(v\right)& \text{Larynx}\\ F& \text{Biologically useful energy}& \left(vi\right)& \text{Tracheal respiration}\\ G& 104\text{mm Hg}& \left(vii\right)& \text{Ethanol}\\ H& \text{Vocal cords}& \left(viii\right)& \text{Branchial respiration}\end{array}$

1. A-(iii), B-(iv), C-(vii), D-(vi), E-(viii), F-(ii), G-(i), H-(v)
2. A-(v), B-(ii), C-(vii), D-(viii), E-(vi), F-(iv), G-(i), H-(iii)
3. A-(vi), B-(iv), C-(viii), D-(v), E-(i), F- (ii), G-(iii), H-(vii)
4. A-(i), B-(v), C-(vii), D-(iii), E-(viii), F-(ii), G-(iv), H-(vi)

Q. Water and blood flows in the same direction through the gills.

1. False
2. True