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251.

Which is not a vestigial organ in man?A. Tail vertebraeB. NailsC. Nictitating membraneD. Vermiform appendix

Answer» Correct Answer - B
Discussion
252.

Which is correct

Answer» Correct Answer - A
Discussion
253.

Which of the following is examples of vestigial structure ?A. Your functional tailboneB. Nipples on male mammalsC. Sixth fingers found in some humanD. Your knee cap

Answer» Correct Answer - D
Discussion
254.

Which of the following is a vestigial structure in man ?A. CaecumB. Pinna of earC. Wisdom toothD. Muscles of glottis.

Answer» Correct Answer - C
Discussion
255.

Precious stones, such as gem stones, are products ofA. Volcanic rocksB. Sedimentory rocksC. Metamorphic rocksD. Igneous rocks.

Answer» Correct Answer - D
Discussion
256.

Age of fossils in the past was generally determined by radiocarbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includesA. Study of carbohydrates and protein in fossils.B. Study of conditions of fossilisationC. Electron spin resonance and fossils DNAD. Presence of carbohyrates and protien in rocks.

Answer» Correct Answer - C
Discussion
257.

Which is incorrectA. Wings of insects and bats are homologousB. Wings of insects and bats are analogousC. Wings of bats and birds are analogous.D. Wings of insects and birds are analogous.

Answer» Correct Answer - A
Discussion
258.

Analogous organs arise due toA. divergent evolutionB. artificial selectionC. genetic driftD. convergent evolution

Answer» Correct Answer - D
Discussion
259.

Which one is incorrect.A. Wings of insects and birds are analogousB. Wings of bat and birds are homologousC. wings of insects and bat are analogousD. Wings of insects and birds are homologous.

Answer» Correct Answer - D
Discussion
260.

An important evidence in favour of organic evolution is the occurrence of `:`A. Homologous and analogous organsB. Homologous and vestigial organsC. Analogous and vestigial organsD. Homologous organs only.

Answer» Correct Answer - A
Discussion
261.

Assertion : Homologous organs have common ancestry and similar function. Reason : Analogous organs have unlike origin and dissimilar function.A. Both Assertion and Reason are true, but Reason is the correct explanation of AssertionB. Both Assertion and Reason are true, but Reason is not the correct explanation of AsserationC. Assertion is true, but Reason is falseD. Both Asseration and Reason are false

Answer» Correct Answer - D
Homologous organs are those , which have the same essential structure , that they inherit from common ancestors though they may be very differntly modified for performing different function
For example , in case of whales , hindlimbs are only represented interlly and are not apparment externally , the forelimbs are modified into paddels and remains the bones of the shoulder, forearm wrist abd fingers all which are enclosed in a fin-shaped sac, the head s fish like but process all the mammalian bones . Analogous organs are structurally different organs , which get modified to perform similar functions
Discussion
262.

Organs related through common descent but now functionally different areA. Analogous organsB. HomologousC. Divergent organsD. Prallel organs.

Answer» Correct Answer - B
Discussion