Competitive Exams: Zoology MCQs (Practice-Test 12 of 112)

  1. Antidieretic hormone (ADH) released b posterior lobe of pituitaty gland stimulates reabsorption of

    1. sodium from distal convoluted tubules of nephron

    2. water from distal convoluted tubules of nephron

    3. water from proximal convoluted tubules of nephron

    4. phosphate form both proximal and distal convoluted tubules of nephron

  2. Pheromones are

    1. Hormones produced for the purpose of mimicry.

    2. synthetic chemicals used to attract insects

    3. chemicals which regulate electrolyte balance in insects

    4. chemicals producted by social insects for communication

  3. Consider the following statements D-glucose, D-galactose and D-fructose are all

    1. isomers

    2. epimers

    3. aldohexoses

    4. monosaccharides

    Which of the above statements are correct?

    1. 1 and 4

    2. 2 and 4

    3. 1, 2 and 3

    4. 1, 2 and 4

  4. The unique property of each acid is determined by

    1. R group of the amino acid

    2. amino group of the amino acid

    3. kinds of peptide bonds of the amino acid

    4. the number of bonds of other amino acids

  5. Extrusion of second polar body form the egg-nucleus in mammals occurs

    1. in the fallopian tube before fertilization

    2. in the fallopian tube after fertilization

    3. in the ovary before release of egg

    4. at the time of entry of oocyte in the fallopian tube

  6. The Golgi complex takes part in the formation of

    1. acrosome of spermatozoan

    2. middle piece of spermatozoan

    3. tail of spermatozoan

    4. head of spermatozoan

  7. The correct sequence of events during fertilization in mammals is

    1. capacitation, activation of egg acrosomal reaction and entry of sperm in egg

    2. capacitation, acrosomal reaction, activation of egg and entry of sperm in egg

    3. acrosomal reaction, activation of egg, capacitation and entry of sperm in egg

    4. activation of egg, arosomal reaction, entry of sperm in egg and capacitation

  8. During fertilization, polyspermy is prevented by

    1. zona pellucida in the presence of Na2 + ions

    2. vitelline membrane in the presence of Ca2 + ions

    3. cortical granules in the presence of Ca2 + and Na + ions

    4. influx of Na, Ca2 + and Mg2 + ions

  9. During gastrulation, small groups of independent cells separate from a primary layer and migrate into the blastocoel, as a new layer, by a process, known as

    1. concrescence

    2. involution

    3. ingression

    4. delamination

  10. The first groups of cells to migrate from the primitive steak during development of chick are those destined to become the

    1. notochord

    2. foregut

    3. hindgut

    4. nerve cord

  11. The functions of allantois in birds are

    1. excretion and nutrition

    2. excretion and protection of the embryo

    3. respiration and nutrition

    4. excretion and respiration

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

    List-I (Type of Placenta) List-II (Animal)
    1. Diffuse

    2. Cotyledonary

    3. Zonary

    4. Bidiscoidal

    1. Monkey

    2. Pig

    3. Cattle

    4. Dog

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 4
      • 1
      • 3
      • 2
      • 1
      • 4
      • 2
      • 3
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
  13. The outer Layer of placenta which is selectively permeable and hormonesecreting is called the

    1. amnion

    2. chorion

    3. allantois

    4. trophoblast

  14. Abiogenic synthesis of life stopped after

    1. the formation of ozone layer

    2. cooling down of high temperature

    3. the emission of ultraviolet rays stopped

    4. the depletion of atmospheric gases

  15. Seymouria is a typical example possessing both

    1. fish and amphibian characters

    2. amphibian and reptilian characters

    3. reptilian and avian characters

    4. avian and mammalian characters