Competitive Exams: Zoology MCQs (Practice-Test 81 of 112)

  1. The coelom in Amphioxus is:

    1. Schizocoelic

    2. Enterocoelic

    3. Hemocoelic

    4. Pseudocoelic

  2. The tadpole of a frog will stop metamorphosing if it is

    1. Kept in a beaker of pond water

    2. Kept in a beaker of pond water containing a few drops of thyroxin

    3. Thyroidectomised

    4. Thyroidectomised and then kept in a beaker of water to which thyroxin has been added

  3. If the dorsal lip of blast pore from an early gastrula of frog is removed, then

    1. Notochord and nerve cord will not differentiate

    2. Archenteron will not be formed

    3. Lateral mesoderm will not be formed

    4. The embryo will immediately die

  4. If, in an experiment, a piece of cellophane paper is placed between the chord mesoderm layer and the overlying ectoderm in an early gastrula of frog, then

    1. It will develop into a normal embryo

    2. It will stop further development

    3. An embryo with two central nervous systems will develop

    4. An embryo without a central nervous systems will develop

  5. The vertical section through the blastoderm of chick is shown in the given diagram. Different parts have been labeled 1 to 4. Match the names of the parts with the numbers used for labeling them in the diagram and select the correct answer using the codes given below:

    1. Epiblast Hypo

    2. blast

    3. Sub germinal space

    4. Blastocoels

    Which is correct

    1. 3 1 4 2

    2. 1 3 2 4

    3. 1 3 4 2

    4. 4 3 1 2

  6. Which one of the following protein breakdown products of chick embryo is stored by its allantois?

    1. Ammonia

    2. Amino acid

    3. Urea

    4. Uric acid

  7. The earliest living forms of life to appear on the earth are believed to be the

    1. Protoviruses

    2. Viruses

    3. Mycoplasma

    4. Bacteria

  8. With the increasing use of DOT the number of DOT resistant mosquitoes has increased to a great extent. In the middle of the present century, their number was insignificant, but now they constitute the major portion of the mosquito population in India. The type of selection operating in this situation is:

    1. Lamarckian selection

    2. Natural selection

    3. Disruptive selection

    4. Artificial selection

  9. Which one of the following sets represents the correct sequence of the evolution of horses?

    1. Eohippus-Parahippus-Miohippus-Merychippus-Equus

    2. Eohippus-Mesohippus-Merychippus-Pliohippus-Equus

    3. Eohippus-Hippation-Mesohippus-Merychippus-Equus

    4. Orohippus-Epihippus-Mesohippus-

    Megahippus-Equus

  10. The term ‘living fossil’ refers to a

    1. Life-like, fossil well preserved in amber

    2. Fossil formed from a living animal

    3. Living animal which is about to be fossilized

    4. Living organism showing some very primitive characteristics

  11. Archaeopteryx belongs to the

    1. Devonian

    2. Jurassic

    3. Cretaceous

    4. Triassic

  12. Which one of the following sets of environmental factors refers to only density-dependent factors?

    1. Temperature, food, disease, light

    2. Food, predation, disease, accumulation of meteorites

    3. Temperature, salinity, predation, disease

    4. Food, salinity, accumulation of metabolites, light

  13. Consider the following organisms:

    1. Peredinium.

    2. Calanus.

    3. Shark.

    4. Herring

    The correct sequence of the arrangement of these organisms in order of their trophic levels is:

    1. 1, 2, 4, 3

    2. 2, 1, 4, 3

    3. 1, 2, 3, 4

    4. 2, 1, 3, 4

  14. Which one of the following gives the best overall picture of the functional nature of community?

    1. Pyramid of biomass

    2. Pyramid of energy

    3. Pyramid of numbers

    4. Food-web

  15. The most important set of Characteristics of the deep sea include

    1. Low temperature, low pressure and low oxygen level

    2. High temperature, high pressure and high oxygen level

    3. Low temperature, high pressure and low oxygen level

    4. High temperature, low pressure and high oxygen level