Competitive Exams: Zoology MCQs (Practice-Test 37 of 112)

  1. The deficiency of which one of the following hormones causes dwarfism and the excess of the same causes gigantism and acromegaly?

    1. Thyrotropin

    2. Somatotropin

    3. Parathormone

    4. Cortisone

  2. Which of the following soak most of the atmospheric CO2?

    1. Cultivated lands

    2. Bacteria

    3. Forests

    4. Oceans

  3. The phenomenon of ‘cyclomorphosis’ exhibited by certain members of Rotifera and Cladocera is caused by

    1. Variation in availability of food

    2. Prey avoidance mechanism

    3. Chemical induction and prey avoidance

    4. Chemical induction and change in the water temperature

  4. If a threshold stimulus is applied to a polarized membrane of a neuron, the

    1. Sodium-Potassium ATPase gets activated

    2. Sodium channels get opened

    3. Potassium channels get opened

    4. Both Sodium and Potassium channels get opened

  5. Consider the following statements regarding Na-K pump

    1. It utilizes ATP

    2. It acts on a resting neuron

    3. It involves efflux of 3 Na + per ATP

    4. It involves influx of 2K + per ATP

    5. Metabolic poisons stop the pump

    Which of the statements given above are correct?

    1. 1 and 2

    2. 1, 2 and 5

    3. 3, 4 and 5

    4. 1, 2, 3, 4 and 5

  6. Consider the following statements: For osmoregulation in aquatic medium

    1. A freshwater fish has to drink water continuously

    2. A marine bony fish has to drink water continuously

    3. A freshwater fish produces copious urine, which is hypsometric o blood

    4. A marine fish produces scanty urine, which is hyper osmotic to blood

    Which of the statements given above is/are correct?

    1. 1 only

    2. 4 only

    3. 1 and 4

    4. 2 and 3

  7. Match List I (Amino acids) with List II (Converted products due to oxidation) and select the correct answer

    List-I List-II
    1. Glycine

    2. Aspertate

    3. Proline

    4. Leucine

    1. a-Ketoglutarate

    2. Succinyl-CoA

    3. Pyruvate

    4. Acetyl-CoA

    5. Oxaloacetate

    • A
    • B
    • C
    • D
      • 3
      • 5
      • 1
      • 4
      • 2
      • 3
      • 5
      • 4
      • 4
      • 5
      • 1
      • 3
      • 3
      • 2
      • 4
      • 5
  8. Biological oxidation involves a sequential transfer of electrons from various dehydrogenate systems towards molecular oxygen. This is accomplished with the help of

    1. Cytochromes located in the inner mitochondrial membrane

    2. Flavoproteins located in the cytosol

    3. Cyanocobalamine located in the outer miltochondrial membrane

    4. Protoporphyrin IX located in the inner miltochondrial membrane

  9. The primary function of cortical reaction or egg activation during fertilization is to

    1. Secrete hyaluronidase enzyme

    2. Block the polyspermy

    3. Form the zygotic nucleus

    4. Change the pH of egg cytoplasm

  10. A major factor which is involved in the process of metamorphosis of amphibia is

    1. Thyroxin

    2. Follicle stimulating hormone

    3. Insulin

    4. Latinizing hormone

  11. When the tadpole larve of frog undergoes the process of metamorphosis then

    1. Fore limbs appear first

    2. Hind limbs appear first

    3. Reduction of tail takes place first

    4. Lungs appear first

  12. In Ascidians during retrogressive metamorphosis, the degenerating structure include

    1. Locomotory, Nervous and Notochord

    2. Digestive, Locomotory and Spinal cord

    3. Nervous, Digestive and Notochord

    4. Digestive and Spinal cord

  13. Rotational cleavage occurs in

    1. Insects

    2. Ascidians

    3. Mammals

    4. Amphibians

  14. In the chick blastoderm, the process of neural plate formation is initiated at

    1. Epiblast

    2. Area opaca

    3. Hypoblast

    4. Neural crest cells

  15. The mesoderm does not give rise to

    1. Muscular system

    2. Nervous system

    3. Circulatory system

    4. Gonads