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6.1 Comparative Anatomy — Test 1
Q1. A right systemic (aortic) arch is retained in:✓ Birds
Q2. In mammals, the systemic (aortic) arch that is retained is the:✓ Left fourth arch
Q3. The 'wishbone' (furcula) of a bird is formed by the fusion of the two:✓ Clavicles
Q4. The foramen of Panizza is found in the heart of:✓ Crocodiles
Q5. The corpus callosum in the mammalian brain connects the:✓ Two cerebral hemispheres
Q6. The centre of memory, learning, thinking and reasoning in the human brain is the:✓ Cerebrum
Q7. Intercalated discs, which join cells and aid synchronised contraction, are found in:✓ Cardiac muscle
Q8. The Wolffian body of the vertebrate embryo is also known as the:✓ Mesonephros
Q9. Testosterone, the male sex hormone, is secreted by the:✓ Leydig (interstitial) cells
Q10. The release of mature sperm from the Sertoli cells into the tubule lumen is called:✓ Spermiation
Q11. After ovulation, the hormone-secreting structure formed in the ovary is the:✓ Corpus luteum
Q12. The tunica dartos is a muscle layer located in the:✓ Scrotum
Q13. Among the aortic arches, the one that forms the pulmonary arteries in land vertebrates is the:✓ Sixth arch
Q14. Cyclostomes (lampreys and hagfishes) are unusual fishes in that they:✓ Lack jaws and paired fins
Q15. A non-myelinated nerve fibre among the following is the:✓ Autonomic (postganglionic) fibre
Q16. The blind spot of the retina has no vision because it is the point where:✓ The optic nerve leaves the eye and there are no photoreceptors
Q17. Birds retain how many pairs of aortic arches in the adult?✓ One (the right systemic, plus the pulmonary)
Q18. The light-sensitive visual pigment rhodopsin is formed by the combination of a protein (opsin) with:✓ 11-cis-retinal (a derivative of vitamin A)
Q19. Among vertebrates, the most advanced and best-separated double circulation is seen in:✓ Birds and mammals
Q20. The evolutionary trend in the vertebrate brain shows a progressive enlargement of the:✓ Cerebrum (forebrain)