Competitive Exams: Zoology MCQs (Practice-Test 104 of 112)

  1. Haeckel's biogenetic law of organic evolution receives support from

    1. palaeontological studies

    2. morphological studies

    3. embryological studies

    4. serological studies

  2. Consider the following statements: Sibling species exhibit

    1. sympatric distribution

    2. morphological similarity

    3. genetic identity

    4. reproductive isolation

      1. 3 alone is correct

      2. 1 and 2 are correct

      3. 2, 3 and 4 are correct

      4. 1, 2 and 4 are correct

  3. The distribution of animals and plants are often controlled by the factor of isolation. The best evidence of geographic isolation of animals comes from the study of flora and fauna of

    1. Borneo

    2. Falkland islands

    3. Tristanda Cunha

    4. None of the above

  4. World's most ancient equine is known as

    1. Hipparium

    2. Orohippus

    3. Merychippus

    4. Hyracotherium

  5. What is the correct chronological sequence of the following divisions of geological times?

    1. Eocene

    2. Carboniferous

    3. Devonian

    4. Cretaceous

    Codes:

    1. 2, 3, 4, 1

    2. 3, 2, 4, 1

    3. 3, 4, 2, 1

    4. 2, 3, 1, 4

  6. Fossil remains of Archaeopteryx were recovered from the rock beds of the

    1. Cretaceous

    2. Jurassic

    3. Triassic

    4. Permian

  7. David Schindler divided a small oligotrophic lake into two halves by suspending a plastic sheet across a narrow neck in the middle of the lake, thus preventing the mixing of the waters of two sides of the plastic sheet. He then added a large amount of phosphates to one half of the lake, leaving the other half as a control. Within a few weeks he observed that

    1. the phosphates dissolved fully and the water became coloured

    2. in the experimental part of the lake the water developed a massive bloom of plankton

    3. in the control part of the lake a luxuriant growth of phytoplankton developed

    4. all the fishes died in the experimental part of the lake

  8. In an ecosystem, which of the given components would form a part such that each component influences the properties of the other?

    1. Abiotic environment

    2. Biotic communities

    3. Producer communities

    Codes:

    1. 1, 2 and 3

    2. 1 and 2

    3. 1 and 3

    4. 2 and 3

  9. The ratio between the energy flow at different points along the food chain, when expressed as percentages, is called

    1. ecological gradient

    2. relative ratio of energy flow

    3. energy flow efficiency

    4. ecological efficiency

  10. As compared to most of the plants, the red algae can thrive at greater depths in water because they

    1. possess special enzymes for photosynthesis in poor light

    2. can tolerate very cold medium

    3. possess supplementary pigments for absorption of light

    4. have developed tolerance to toxic metabolites

  11. Species having wide geographical ranges often develop locally adapted populations called

    1. prototypes

    2. paratypes

    3. syntypes

    4. ecotypes

  12. The pelagic animals remain floating in open waters without sinking to the bottom. For this ability to remain afloat, which of the following adaptations have been developed by these organisms?

    1. Reduced skeletal and shell materials

    2. Incorporation of large amounts of water or air in their tissues

    3. Glandular structures that secrete gases into them

    4. Hollow bones

    Codes:

    1. 2, 3 and 4

    2. 1, 2 and 3

    3. 1, 3 and 4

    4. 1, 2 and 4

  13. Match List I with List II and select the correct answer

    List-I List-II
    1. Parasitism

    2. Harmful insect

    3. Sociallife

    4. Mating competition

    1. Intraspecific relationship

    2. Termite

    3. Aphid

    4. Insterspecific relationship

    5. Elephant

    • A
    • B
    • C
    • D
      • 3
      • 1
      • 5
      • 2
      • 4
      • 2
      • 3
      • 1
      • 3
      • 4
      • 5
      • 2
      • 4
      • 3
      • 2
      • 1
  14. Circadian rhythm is the metabolic or behavioural rhythm of

    1. 24 minutes cycle

    2. 24 hours cycle

    3. 24 days cycle

    4. 24 months cycle

  15. B. O. D. Is a measure of polluting organic matter present in a sample of

    1. water

    2. air

    3. soil

    4. bottom mud from a pond