Competitive Exams: Zoology MCQs (Practice-Test 18 of 112)

  1. Changes in the body form of some planktonic animals with seasonal change in temperature are grouped under

    1. anamorphosis

    2. cyclomorphosis

    3. metamorphosis

    4. heteromorphosis

  2. Which of the following fishes is NOT conducive to corn posite fish farming?

    1. Cirrhinus mrigala

    2. Labeo rohita

    3. Catle catla

    4. Mystus seenghala

    • Assertion (A): Prokaryote cells proliferate at a much more rapid rate than eukaryotes.
    • Reason (R): In prokaryotes there is not condensation of the chromosomes, no spindle apparatus and they follow simple duplication and separation of DNA pattern.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Each gene can exist in a variety of different forms called alleles.
    • Reason (R): Different alleles of the same gene arise by heritable changes (mutations) in the gene itself.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Pila produces two type of sperm, namely eupyrene and oligopyrene.
    • Reason (R): Eupyrene sperm has XX chromosomes and can produce only female while oligopyrene sperm has XY chromosomes and can produce only male.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Echinodermata and Hemichordata are both deuterostomes.
    • Reason (R): During early development of these phyla, the blastopore becomes the mouth opening.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Bryoza is now divided into two separate phyla-Endoprocta and Ectoprocta.
    • Reason (R): Though Endoprocta has some superficial similarities with Ectoprocta, the former is coelomate and the altter acoelomate.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The ‘killer’ stains of Paramecium aurelia produce a toxic substance (paramecin) which kills the sensitive ones.
    • Reason (R): Such ‘killer’ stains lack the kappa particles.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The adults of echinoderms generally exhibit pentamerous radial symmetry.
    • Reason (R): A unique ambulacral system is typically present in echinoderms.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Balanoglossus is not a chordate.
    • Reason (R): The so-called notochord of Balanoglossus is only pre-oral extension of the gut.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In birds, the synsacrum is fused with the pelvic girdle.
    • Reason (R): The synsacrum provides a rigid framework for perching.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The accidental leak of methyl isocyanate from a storage tank of a factory in Bhopal in 1980 killed more than 25, 000 people.
    • Reason (R): In the factory, the safety scrubber chimneys, filled with the detoxifying solution failed to function.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): After removal of parathyroids in lizards the blood calcium level rises rapidly.
    • Reason (R): Parathyroids regulate the level of calcium in blood.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Linoleic acid and linolenic acid are essential polyunsaturated fatty acids.
    • Reason (R): Linoleic acid and linolenic acids are biosynthesized in human beings.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): As a fuel, coal releases two-thirds more carbon dioxide per unit of energy than does gasoline.
    • Reason (R): Coal is largely carbon, whereas gasoline contains more hydrogen.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but R is NOT the correct explanation of A

    3. A is true but R is false

    4. A is false but R is true