Biology 12 Chapter 15 Homeostasis - 5

Biology 12 Chapter 15 Homeostasis - 5

1. All the fresh water animals are …………… to their environment?

a) Hypertonic.
b) Neutral.
c) Hypotonic.
d) Isotonic.

2. Bony fishes are …………. to their environment?

a) Isotonic.
b) Neutral.
c) Hypotonic.
d) Hypertonic.

3. What are the cells called with the help of which freshwater animals transport salts from external dilute medium?

a) Ammonotelic.
b) Ionocytes.
c) Rectal glands.
d) Leucocytes.

4. What is TRUE about freshwater fishes?

a) Water leaves gill capillaries by osmosis.
b) Actively secretes Na and Cl ions across gills.
c) Don’t drink water.
d) Concentrated urine.

5. What is TRUE about freshwater fishes?

a) Water leaves gill capillaries by osmosis.
b) Concentrated urine.
c) Actively secretes Na and Cl ions across gills.
d) Water enters gill capillaries by osmosis.

6. What is TRUE about freshwater fishes?

a) Concentrated urine.
b) Water leaves gill capillaries by osmosis.
c) Very dilute urine.
d) Actively secretes Na and Cl ions across gills.

7. What is TRUE about freshwater fishes?

a) Actively secretes Na and Cl ions across gills.
b) Concentrated urine.
c) Active uptake of Na and Cl ions across gills.
d) Water leaves gill capillaries by osmosis.

8. What is TRUE about Marine fishes?

a) Water leaves gill capillaries by osmosis.
b) Actively secretes Na and Cl ions across gills.
c) Concentrated urine.
d) All of these.

9. What is TRUE about marine fishes?

a) Very dilute urine.
b) Water enters gill capillaries by osmosis.
c) Active uptake of Na and Cl ions across gills.
d) Drinks sea water.

10. Which one is osmoconformers?a) Elasmobranches.
b) All freshwater animals.
c) Marine vertebrates.
d) None.

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