Competitive Exams: Zoology MCQs (Practice-Test 89 of 112)

    • Assertion (A): Cuticle of Ascaris is well developed in structure and chemical organization.
    • Reason (R): The parasite has to protect itself from the injurious effects of the host's chyme.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Hirudo medicinalis sucks blood from different vertebrates.
    • Reason (R): Its buccal cavity includes three jaws.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In Herdmania, the test is provided with vascular ampullae.
    • Reason (R): These structures serve as means of excretion of waste products of the body.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Anguilla anguilla can travel on damp grass.
    • Reason (R): Anguilla anguilla has vascular areas in the skin and its opercular openings are very small so that it retains water in the branchial chamber during its journey on land.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In Amniota there are twelve pairs of cranial nerves instead of ten.
    • Reason (R): Aminiotas have two additional segments in the head region.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): The eyes of nocturnal, cave and deep water animals have only rods in their retina.
    • Reason (R): Rods detect differences in the intensity of light but do not discriminate finer details of objects.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In Branchiostoma, the origin of coelome is enterocoelic.
    • Reason (R): In Branchiostoma, coelome is formed from the splitting of mesodermal sheet.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Cell movement during gastrula ion is called morphogenetic movement.
    • Reason (R): Change of shape of embryo occurs by morphogenetic movement.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In the late embryonic stage of chick, the embryo still derives its nutrition from the yolk although the neck of the yolk sac is constricted.
    • Reason (R): The omphalo-mesenteric vessels supply the nutrition to the developing embryo.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Guinea worm can thrive only in the lymphatic tissue.
    • Reason (R): Lymph is a fluid.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Pyramid of number and biomass may be inverted but the pyramid of energy must always take an upright shape.
    • Reason (R): Producer and consumer communities vary in their shape and size whereas the energy has to follow the second law of thermodynamics.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Heterosis causes hybrid sterility in drosophila.
    • Reason (R): Heterosis is an essential condition for the establishment of balanced polymorphism in Drosophila.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): In a diploid organism only the dominant mutations will show their effect immediately, the recessive mutations do not influence the traits immediately.
    • Reason (R): The recessive mutants accumulate in the gene pool and once the recessive mutation has established in homozygous state it is exposed to natural selection.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

    • Assertion (A): Flagellates are seen in the digestive tract of termites.
    • Reason (R): Flagellates are internal parasites in termites.
    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 a correct explanation of A

    3. A is true but R is false

    4. A is false but R is true

  1. Antigenicity of human erythrocyte membrance is due to

    1. Glycocalyx

    2. Receptor proteins

    3. Membrance-bound enzymes

    4. Glycophorin