Choose the correct statements regarding frog's anatomy: A. Hepatic portal system is the special venous connection between liver and intestine. B. There are twelve pairs of cranial nerves arising from the brain. C. The ureters and oviducts open separately into the cloaca in female frogs. D. Hind-brain consists of cerebellum, medulla oblongata and optic lobes. E. Sinus venosus joins the right atrium of heart. Choose the correct answer from the options given below:

Solution & Explanation

Answer: (D) A, C and E only. A is correct (hepatic portal system links liver and intestine). C is correct (in female frogs the ureters and oviduct open separately into the cloaca). E is correct (the sinus venosus joins the right atrium). B is wrong — frogs have ten (not twelve) pairs of cranial nerves. D is wrong — the optic lobes belong to the mid-brain; the hind-brain consists only of cerebellum and medulla oblongata. NCERT (Class XI, Ch 7 Structural Organisation in Animals): p.82-83, lines 33-35 (portal systems), p.83 lines 3 (female ducts), 22 (ten cranial nerves), 28-30 (midbrain optic lobes; hindbrain cerebellum and medulla) and p.82 line 28 (sinus venosus) — "There are ten pairs of cranial nerves arising from the brain."