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AIPMT 2007 Biology Screening

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Q. 21. When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:

  1. Convergent evolution
  2. Divergent evolution
  3. Microevolution
  4. Co-evolution

Sol. Correct choice: (1)

Q. 22. Adaptive radiation refers to:

  1. Power of adaptation in an individual to a variety of environments
  2. Adaptations due to Geographical isolation
  3. Evolution of different species from a common ancestor
  4. Migration of members of a species to different geographical areas

Sol. Correct choice: (3)

Q. 23. The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for:

  1. growth the movement
  2. responsiveness to touch
  3. interaction with the environment and progressive evolution
  4. reproduction

Sol. Correct choice: (4)

Q. 24. The Finches of Galapogas islands provide an evidence in favour of:

  1. Biogeographical Evolution
  2. Special Creation
  3. Evolution due to Mutation
  4. Retrogressive Evolution

Sol. Correct choice: (1)

Q. 25. One of the important consequences of geographical isolation is:

  1. Random creation of new species
  2. No change in the isolation faunax
  3. Preventing Speciation
  4. Speciation through reproductive isolation

Sol. Correct choice: (4)

Q. 26. Industrial melanism as observed in peppered moth proves that:

  1. Melanism is a pollution-generated feature
  2. The true black melanic forms arise by a recurring random mutation
  3. The melanic form of the moth has no selective advantage over lighter form in industrial area
  4. 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. Correct choice: (2)

Q. 27. The concept of chemical evolution is based on:

  1. Possible origin of life by combination of chemicals
  2. Crystallization of chemicals under suitable environmental conditions
  3. Interaction of water, air and clay under
  4. Effect of solar radiation of chemicals

Sol. Correct choice: (1)

Q. 28. Among the human ancestors the brain size was more than 1000 CC in:

  1. Homo habilis
  2. Homo neanderthalensis
  3. Homo erectus
  4. 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. Correct choice:

Q. 29. Which of the following pairs are correctly matched?

  1. Crocodile
  2. Sea Urchin
  3. Obelia
  4. 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. Correct choice: (2)

Q. 30. Select the correct statement from the following:

  1. Mutations are random and directional
  2. Darwinian variations are small and directionless
  3. Fitness is the end result of the ability to adapt and gets selected by nature
  4. All mammals except whales and camels have seven cervical vertebrate.

Sol. It explains natural selection. Correct choice: (3)

Q. 31. Which one of the following is a matching pair of a body feature and the animal possessing it?

  1. Ventral heart
  2. Post-anal tail
  3. Ventral Central nervous system
  4. Pharyngeal gill slits absent in embryo

- Scorpion
- Octopus
– Leech

– Chamaeleon

Sol. Scorpion has dorsal heart. Post-anal tail is found only in chordates. Pharyngeal gill slits are present in the embryo of chameleon. Correct choice: (3)

Q. 32. What is common between parrot, platypus and kangaroo?

  1. Ovoparity
  2. Homoiothermy
  3. Toothless jaws
  4. Functional post -anal tail

Sol. Only birds & mammals are homoiothermous. Correct choice: (2)

Q. 33. What is true about Nereis, Scorpion, Cockroach and Silver fish?

  1. They all belong to the same phylum
  2. They all have jointed paired appendages
  3. They all possess dorsal heart
  4. None of them is aquatic

Sol. Correct choice: (3)

Q. 34. Which one of the following statement is correct?

  1. Ontogeny repeats phylogeny
  2. Stem cells are specialized cells
  3. There is no evidence of the existence of gills during embryogenesis of mammals
  4. All plant and animal cells are totipotent.

Sol. Correct choice: (1)

Q. 35. “Foolish Seedling” disease of rice led to the discovery of:

  1. IAA
  2. GA
  3. ABA
  4. 2, 4 – D

Sol. Foolish seeding disease (Bakane disease) of rice is due to a fungus Giberella fujikuroi. Yabuta and Sumuki obtained achemical from the fungus and called gibbrellic acid. Correct choice: (2)

Q. 36. Passage cells are thin- walled cells found in:

  1. central region of style through which the pollen tube grows towards the ovary.
  2. endodermis of roots facilitating rapid transport of water from cortex to pericycle.
  3. phloem elements that serve as entry points for substances for transport to other plant parts.
  4. testa of seed to enable emergence of growing embryonic axis during seed germination.

Sol. Passage cells also called transfusion tissue are found in the endodermis meant for rapid transport of water from cortex to pericycle. Correct choice: (2)

Q. 37. The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:

  1. Quinone
  2. Cytochrome
  3. Iron-sulphur protein
  4. Ferredoxin.

Sol. The first acceptor of electros from an excited chlorophyll is quinone. Correct choice: (1)

Q. 38. All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is:

  1. succinate dehydrogenase
  2. lactate dehydrogenase
  3. isocitrate dehydrogenase
  4. malate dehydrogenase

Sol. Succinate dehydrogenase is a common enzyme for TCA and ETC. It is located on inner mitochondrial membrane. Rest of the TCA enzymes are present in mitochondrial matrix. Correct choice: (1)

Q. 39. The wavelength of light absorbed by Pr form of phytochrome is:

  1. 620 nm
  2. 640 nm
  3. 680 nm
  4. 720 nm

Sol. The Pr form of phytochrome receives red light (600-680 nm) and changes into Pfr. Correct choice: (3)

Q. 40. Opening of floral buds into flowers, is type of:

  1. Autonomic movement of growth
  2. Autonomic movement of locomotion
  3. Autonomic movement of variation
  4. Paratonic movement of growth.

Sol. Opening of floral bud into flowers, is due to epinasty, a type of autonomic movement of growth. Correct choice: (1)

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