Consider the following statements to identify the correct one to answer the question from the codes given below:
(1) Maxillary teeth of frog are homodont and diphyodont.
(2) Sinus venosus of the heart of frog opens into right auricle.
(3) There are ten pairs of cranial nerves in frog.
Choose the correct answer from the codes given below:

Correct option is A

Correct Answer: (a)
Explanation:
(1) is false — frog teeth are homodont (similar in shape) but not diphyodont; amphibians replace teeth repeatedly (polyphyodont), so “diphyodont” is incorrect.
(2) is true — the sinus venosus receives systemic veins and opens into the right auricle (atrium) in frogs.
(3) is true — a frog typically has ten pairs of cranial nerves.
Information Booster:
Homodonty: teeth of same form — common in many non-mammalian vertebrates.
Diphyodonty = two sets of teeth (milk + permanent) — characteristic of many mammals, not frogs.
Sinus venosus is a thin-walled chamber in amphibian hearts, preceding the atrium.
Cranial nerve number varies among vertebrate groups; frogs are commonly taught to have 10 pairs.
Polyphyodonty (multiple replacements) is typical in fishes and amphibians.