Biology MCQs

Page No. 32

Diameter of thick filament is____________?


a7 nm.

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b8 nm

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c16nm

✓


d10-100 ?m.

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View Answer 16nm

Which of the following animal has a hydrostatic skeleton?


aEarthworm

✓


bRound worm

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cTape worm

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dPin worm

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View Answer Earthworm

A smallest contractile unit of muscle contraction called sarcomere is the area between two:


aH- zone

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bM- Line

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cZ- Line

✓


dA band

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View Answer Z- Line

Gibberellins is an example of_________________?


aGrowth inhibitor

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bGrowth stimulator

✓


cGrowth hormone

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dNone of these

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View Answer Growth stimulator

Which of the following statements is incorrect about skeletal muscle fibers?


aThey are multinucleated.

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bThey are 10 – 100 ?m in diameter & surrounded by sarcolemma

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cThey contain O2 storing molecules called hemoglobin.

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dTheir cytoplasm contains high concentration of carbohydrates

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Epinasty is controlled by_____________?


aGibberellins

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bAbscisins

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cAuxins

✓


dCytokinins

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View Answer Auxins

Why skeletal muscles are called striated muscles?


aThey appear darker than smooth muscles by naked eye.

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bAlternating dark and light bands appear on their surface when visualized by naked eye.

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cAlternating dark and light bands appear on their surface when visualized via a microscope.

✓


dAll of these

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Roots of a plant show______________?


aPositive phototropism and negative geotropism

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bNegative phototropism and positive geotropism

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cNegative tactic movement and positive tropic movement

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dPositive geotropism of stem and roots

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The contraction of which of the following muscle fibers, is controlled by hormones?


aA smooth muscle

✓


bA cardiac muscle

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cA skeletal muscle

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dAll of these

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View Answer A smooth muscle

Rapid movement of leaves of mimosa on touching is an example of _____________?


aTurgor movement

✓


bNastic movement

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cTropic movements

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dGrowth movement

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View Answer Turgor movement

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