Competitive Exams: Zoology MCQs (Practice-Test 17 of 112)

  1. Wallace's line passes between

    1. Sumatra and Java

    2. Borneo and Celebes

    3. Timor and New Guinea

    4. Bali and Lombok

  2. The lowest temperature at which organisms can live indefinitely is known as

    1. minimum survival temperature

    2. minimum effective temperature

    3. minimum critical temperature

    4. incipient lethal low temperature

  3. Which one of the following ecological pyramids can NEVER be inverted?

    1. Pyramid of number

    2. Pyramid of size

    3. Pyramid of biomass

    4. Pyramid of energy

  4. Which one of the following statements is NOT correct pertaining to changes in the abiotic environment?

    1. Annual changes in temperature in aquatic environments are more marked in temperate fresh water climates than in other climates

    2. Temperature is the major factor in the creation of ocean currents and air currents

    3. At global level, human activities contribute nine times more particulate matter or acrosols into the air than do natural processes

    4. In the troposphere, photo oxidation of hydrocarbons in the presence of nitrogen oxides produces ozone

  5. In the population growth curve given below, in which segment the growth rate dN/dt will be maximum?

    1. 1

    2. 2

    3. 3

    4. 4

  6. The approximate number of species of reptiles described so far is

    1. 26, 500

    2. 18, 200

    3. 6, 300

    4. 4, 100

  7. The biological clock in higher verterbrates is regulated by

    1. the pituitary gland

    2. cerebral cortex

    3. xupra-chiasmatic nucleus in hypothalamus

    4. thymus

  8. Which one of the following statements about circadian rhythm is correct?

    1. Circadian rhythm dependent on endogenous clock, is restricted to birds and mammals

    2. An animals circadian rhythm has a period of exact 24 hours

    3. The period of circadian rhythm is NOT exactly 24 hours

    4. Circadian rhythm is necessary because earth is tilted on its axis

  9. Consider the following statements:

    1. The energy flow in an ecosystem results in entropy

    2. In prairie ecosystems, 90 per cent of the secondary productivity occurs in the soil

    3. The detritus chain is of greater importance in energy flow in mans ecosystems than are herbivorous/carnivorous/omnivorous grazing chains.

    Which of these statements are correct?

    1. 1 and 2

    2. 1, 2 and 3

    3. 2 and 3

    4. 1 and 3

  10. An insecticide, applied to the root, stem, leaves or seeds of plants, is absorbed and reaches different parts of plants. The ZOOLOGY insect, feeding on the treated plants, ingests the poison through its sucking mechanism. Such a poison is termed

    1. fumigant

    2. contact poison

    3. respiratory poison

    4. systemic poison

  11. Match List I with List II and select the correct answer:

    List-I List-II (Source)
    1. Sagreen

    2. Isinglass

    3. Caviar

    4. Fish guano

    1. Fish manure

    2. Sturgeon

    3. Skin of elasmobranches

    4. Air bladder of fish

    • A
    • B
    • C
    • D
      • 2
      • 4
      • 3
      • 1
      • 3
      • 1
      • 2
      • 4
      • 2
      • 1
      • 3
      • 4
      • 3
      • 4
      • 2
      • 1
  12. Which one of the following snakes has sensitive patches called pits that help the snake in. Tracking down warm blooded animals even in pitch darkness?

    1. Banded krait

    2. Cobra

    3. Green phyton

    4. Rattle snake

  13. Even though limbs and girdles are generally not found in snakes, vestiges of the pelvic girdle and hind limbs persis in

    1. king cobra

    2. sea snake

    3. python

    4. viper

  14. Duchenne muscular dystrophy is caused by the presence of

    1. a defective gene in X chromosome

    2. an exfra18th chromosome

    3. two X chromosomes and one Y chromosome in an individual

    4. an extra 21st chromosome

  15. Forensic scientists have to work often with extremely small samples of DNA obtained from the hair or other sources of suspected criminals. However, it is possible to produce DNA ‘finger print’ from these small samples by using

    1. polymerase chain reaction

    2. genetically engineered microorganisms

    3. gene cloning

    4. gene ‘gun’