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4.3 Amphibia — Test 1
Q1. An example of the amphibian order Gymnophiona (Apoda) is:✓ Ichthyophis
Q2. The kidney of an adult frog is of the type:✓ Mesonephric
Q3. The main excretory product of the adult frog is:✓ Urea
Q4. The conus arteriosus, a chamber leaving the heart, is present in:✓ Amphibians
Q5. In the frog's three-chambered heart, oxygenated and deoxygenated blood:✓ Mix to some extent in the single ventricle
Q6. Red blood cells of amphibians are:✓ Oval, biconvex and nucleated
Q7. Amphibians can exchange gases through their skin because the skin is:✓ Moist and richly supplied with blood vessels
Q8. The dual life of amphibians refers to their ability to live:✓ Both in water and on land
Q9. The larva of a frog (tadpole) differs from the adult in that it:✓ Breathes with gills and has a tail
Q10. Metamorphosis of a tadpole into an adult frog is controlled mainly by:✓ Thyroid hormone (thyroxine)
4.3 Amphibia — Test 2
Q11. Amphibians are cold-blooded, meaning they:✓ Cannot regulate their own body temperature
Q12. The organ of Jacobson (vomeronasal organ) in amphibians functions in:✓ Olfaction (smell)
Q13. A viviparous (live-bearing) amphibian is found among the:✓ Caecilians (some species)
Q14. The columella (stapes) in the amphibian middle ear functions to:✓ Transmit sound vibrations to the inner ear
Q15. Amphibians were the first vertebrates to:✓ Successfully colonise land (while still tied to water)
Q16. Frogs return to water to breed because their eggs:✓ Lack a shell and would dry out on land
Q17. The three living orders of amphibians are Anura, Urodela and:✓ Gymnophiona (Apoda)
Q18. The skin of amphibians is generally:✓ Smooth, moist and without scales
Q19. During hibernation, frogs survive winter by:✓ Becoming dormant and breathing through the skin
Q20. Amphibians evolved from which group of fishes?✓ Lobe-finned (sarcopterygian) fishes