All India Institute of Medical Sciences 2008 - Question Paper

Q. 25. 1 of the important consequences of geographical isolation is:
a. Random creation of new species
b. No change in the isolation faunax
c. Preventing Speciation
d. Speciation through reproductive isolation
Sol. accurate choice: (4)
Q. 26. Industrial melanism as observed in peppered moth proves that:
a. Melanism is a pollution-generated feature
b. The actual black melanic forms arise by a recurring random mutation
c. The melanic form of the moth has no selective advantage over lighter form in industrial area
d. The lighter-form moth has no selective advantage either in polluted industrial area or non-polluted area.
Sol. It is an example of directional selection. accurate choice: (2)
Q. 27. The concept of chemical evolution is based on:
a. Possible origin of life by combination of chemicals
b. Crystallization of chemicals under suitable environmental conditions
c. Interaction of water, air and clay under
d. Effect of solar radiation of chemicals
Sol. accurate choice: (1)
Q. 28. Among the human ancestors the brain size was more than 1000 CC in:
a. Homo habilis
b. Homo neanderthalensis
c. Homo erectus
d. Ramapithecus
Sol. Homo habilis had a cranial capacity in the range of 680-720 c.c. & that of
Homo erectus erectus 775-990 c.c,
Homo erectus pekinensis 915-1200 c.c.
Homo neanderthalensis 1300-1600 c.c. accurate choice:
Q. 29. Which of the subsequent pairs are correctly matched?
a. Crocodile b. Sea Urchin c. Obelia d. Lemur - 4-Chambered heart- Parapodia– Metagenesis– Thecodont
(1) Only A and B
(2) A, C and D
(3) B, C and D
(4) Only A and D
Sol. accurate choice: (2)
Q. 30. choose the accurate statement from the following:
a. Mutations are random and directional
b. Darwinian variations are small and directionless
c. Fitness is the end outcome of the ability to adapt and gets opted by nature
d. All mammals other than whales and camels have 7 cervical vertebrate.
Sol. It explains natural selection. accurate choice: (3)
Q. 31. Which 1 of the subsequent is a matching pair of a body feature and the animal possessing it?
a. Ventral heart b. Post-anal tail c. Ventral Central nervous system d. Pharyngeal gill slits absent in embryo - Scorpion- Octopus– Leech– Chamaeleon
Sol. Scorpion has dorsal heart. Post-anal tail is obtained only in chordates. Pharyngeal gill slits are current in the embryo of chameleon. accurate choice: (3)

Earning:   Approval pending.