Competitive Exams: Zoology MCQs (Practice-Test 93 of 112)

    • Assertion (A): In human beings father determines the sex of a child.
    • Reason (R): Man produces two types of sperms, one with X chromosome and the other with Y chromosome, whereas woman produces only one type namely, that of X chromosome bearing egg.
    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): Archaeopteryx is the connecting link between reptiles and birds.
    • Reason (R): It is placed in the sub-class

    Archaeornithes.

    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): Self-fertilization never takes place in Hydra.
    • Reason (R): Hydra is portentous.
    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 Taenia, gravid proglottids undergo V the process of apolysi.
    • Reason (R): Taenia does not have an alimentary canal.
    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 body cavity of leech is filled with botryoidal tissue.
    • Reason (R): Leech lacks true coelom.
    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. Presence of sweat and sebaceous glands is considered to be distinguishing characters of typical mammals. However, both these glands are absent in

    1. orangutan

    2. whale

    3. lemur

    4. wombat

  2. Teeth attachment, succession and type of dentition in sperm whale can be described respectively as

    1. pleurodont, Polyphyodont and Homodont

    2. Acrodont, Diphyodont and Homodont

    3. Thecondont, Polyphyodont and Heterodont

    4. Thecondont, Monophyodont

    Homodont

  3. Which one of the following sequences is the correct route of circulation in the human heart?

    1. Right auricle-right ventriclepulmonary arterylungs-pulmonary veins-left auricle-left ventricle-aorta

    2. Left auricle-right auricle-righ ventricle-pulmonary artery-lungs-pulmonary veins-left ventricleaorta

    3. Right auricle-left auricle-right ventricle-pulmonary artery-lungs pulmonary veins left ventricle aorta

    4. Right auricle-right ventricle-pulmonary veins, lungs-pulmonary artery-left auricle left ventricle-aorta

  4. The metanephric duct is

    1. nothing but embryonic pronephric duct

    2. nothing but embryonic mesonephric duct

    3. developed from metanephric tubules

    4. developed as an outgrowth of cloaca

  5. Cerebrospinal fluid is secreted by

    1. the epithelial cells lining the central canal of the spinal cord

    2. nerve cells of the spinal cord

    3. the piamater

    4. the choroid plexus

  6. Sound is transmitted in the ear in which one of the following directions?

    1. Tympanic membrane-ear ossicles-membrance of fenestra ovalis-perilymph-reissner's membrane-endolymph basilar membrane-organ of corti-auditory nerve-temporal lobes of the brain

    2. Tympanic membrane-malleus, incus, stapes-endolymph-Reissner's membrane-perilymph-basilar membrane-organ of corti-auditory nerve-brain

    3. Ear ossicles-tympanic membrane-perilymph-basilar membrane-endolymph-organ of corti-auditory nerve-brain

    4. Tympanic membrane-ear ossicles-perilymph-basilar membrane-endolymph-organ of corti-auditory nerve-brain

  7. Which one of the following sets of bones is modified to form ear ossicles in mammals?

    1. Hyomandibular, quadrate and articular

    2. Hyomandibular, symplectic and quadratojugal

    3. Hyomandibular, quadrate and sympletic

    4. Hyomandibular, articular and quadratojugal

  8. Digitigrade locomotion is characteristic of

    1. Cat

    2. man

    3. sheep

    4. horse

  9. Which one of the following has isoenzymes?

    1. Lactic dehydrogenase

    2. Hexokinase

    3. Citrate synthetase

    4. Aldolase

  10. During increased blood pressure, which one of the following pairs of centres is normally involved in the regulation of heart beats and circulation?

    1. Cardio-stimulatory and vasoconstrictor centres

    2. Cardio-inhibitory and vasoconstrictor centres

    3. Cardio-stimulatory and vasodilator centres

    4. Cardio-inhibitory and vasodilator centres