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AIPMT 2007 Biology Screening

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Q. 61. During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

  1. First positive, then negative and again back to positive
  2. First negative, then positive and again back to negative
  3. First positive, then negative and continue to be negative
  4. First negative, then positive and continue to be positive.

Sol. Correct choice: (2)

Q. 62. A person is having problems with calcium and phosphorous metabolism in his body. Which one of the following glands may not be functioning properly?

  1. Thyroid
  2. Parathyroid
  3. Parotid
  4. Pancreas

Sol. Correct choice: (2)

Q. 63. Identify the odd combination of the habitat and the particular animal concerned:

  1. Rann of Kutch
  2. Dachigam National Park
  3. Sunderbans
  4. Periyar

- Wild Ass
- Snow Leopard
–Bengal Tiger
–Elephant

Sol. Dachigam National Park is for the conservation of Hangul.
Correct choice: (2)

Q. 64. In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

  1. S < DE < PE < SE
  2. SE < S < PE < DE
  3. SE < PE < S < DE
  4. PE < S < SE < DE

Sol. BOD of distillery effluent is 40,000 mg / l and that of paper mill effluent and sewage is 190 mg/l and 30 mg/l, respectively. Correct choice: (2)

Q. 65. Which one of the following ecosystem types has the highest annual net primary productivity?

  1. Temperate deciduous forest
  2. Tropical rain forest
  3. Tropical deciduous forest
  4. Temperate evergreen forest

Sol. Tropical rain forest has highest annual net primary productivity (9000 K cal / m 2 / yr). Correct choice: (2)

Q. 66. Which one of the following is being utilized as a source of biodiesel in the Indian countryside?

  1. Pongamia
  2. Euphorbia
  3. Beetroot
  4. Sugarcane

Sol. Pongamia, Jatropa, Euphorbia are petrocrops. However, in the Indian countryside, Pongamia (Kanjar) is being utilized as a source of biodiesel. Correct choice: (1)

Q. 67. In a coal fires power plant electrostatic precipitators are installed to control emission of:

  1. CO
  2. SO2
  3. NOX
  4. SPM


Sol. Electrostatic precipitators control emission of suspended particle matter (SPM). Correct choice: (4)

Q. 68. Which one of the following is not a bioindicator of water pollution?

  1. Sewage fungus
  2. Sludge-worms
  3. Blood-worms
  4. Stone flies

Sol. Correct choice: (4)

Q. 69. A high density of elephant population in an area can result in:

  1. Predation on one another
  2. Mutualism
  3. Intra specific competition
  4. Inter specific competition

Sol. Intra-specific competition occurs between the members of the same species. Correct choice: (3)

Q. 70. Geometric representation of age structure is a characteristic of:

  1. Ecosystem
  2. Biotic community
  3. Population
  4. Landscape

Sol. Age structure is one of the characteristics of population. Correct choice: (3)

Q. 71. Which one of the following pairs of organisms are exotic species introduced in India?

  1. Nile perch, Ficus religiosa
  2. Ficus religiosa, Lantana camara
  3. Lantana camara, Water hyacinth
  4. Water hyacinth, Prosopis cineraria

Sol. Lantana camara and Eicchornia czassipes (water hyacinth) are exotic species. Correct choice: (3)

Q. 72. One of endangered species of Indian medicinal plants is that of:

  1. Nepenthes
  2. Podophyllum
  3. Ocimum
  4. Garlic

Sol. Podophyllum hexandrum - : (Papri), gives a drug from its rhizome; besides being stimulant and purgative and has destructive action on cancerous tissues. Correct choice: (2)

Q. 73. A genetically engineered micro-organism used successfully in bioremediation of oil spills is a species of:

  1. Bacillus
  2. Pseudomonas
  3. Trichoderma
  4. Xanthomonas

Sol. Pseudomonas putida (superbug) developed by genetic engineering by Anand Mohan Chakravorty is used to control oil spills. Correct choice: (2)

Q. 74. A sequential expression of a set of human genes occurs when a steroid molecule binds to the:

  1. Ribosome
  2. Transfer RNA
  3. Messenger RNA
  4. DNA sequence

Sol. Correct choice: (4)

Q. 75. The Okazaki fragments in DNA chain growth:

  1. polymerize in the direction and explain DNA replication
  2. result in transcription
  3. polymerize in the direction and forms replication fork
  4. prove semi-conservative nature of DNA replication

Sol. Replication occurs always in direction. Okazaki fragments, synthesized on DNA template, join to form lagging strand which grows in direction. Correct choice: (1)

Q. 76. In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are:

  1. n = 21 and x = 7
  2. n = 7 and x = 21
  3. n = 21 and x = 21
  4. n = 21 and x = 14

Sol. The basic number (x) of wheat is 7. Thus the 6x = 2n = 42 and n = 21. Correct choice: (1)

Q. 77. Molecular basis of organ differentiation depends on the modulation in transcription by:

  1. Anticodon
  2. RNA polymerase
  3. Ribosome
  4. Transcription factor

Sol. Correct choice: (4)

Q. 78. Telomere repetitive DNA sequence control the function of eukaryote chromosomes because they:

  1. prevent chromosome loss
  2. act as replicons
  3. are RNA transcription initiator
  4. help chromosome pairing

Sol. Telomerase seal the ends of the chromosomes. Correct choice: (1)

Q. 79. Inheritance of skin colour in humans is an example of:

  1. codominance
  2. chromosomal aberration
  3. point mutation
  4. polygenic inheritance

Sol. Inheritance of skin colour in human is controlled by three genes, A, B and C. Correct choice: (4)

Q. 80. A common test to find the genotype of a hybrid is by:

  1. crossing of one F1progeny with male parent
  2. crossing of one F2 progeny with male parent
  3. crossing of one F2 progeny with female parent
  4. studying the sexual behaviour of F1 progenies.

Sol. To find the genotype of hybrid, it is test crossed. Correct choice: (1)

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