Biology MCQs

Page No. 32

Diameter of thick filament is____________?


a7 nm.


b8 nm


c16nm


d10-100 ?m.


View Answer 16nm

Which of the following animal has a hydrostatic skeleton?


aEarthworm


bRound worm


cTape worm


dPin worm


View Answer Earthworm

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


aH- zone


bM- Line


cZ- Line


dA band


View Answer Z- Line

Gibberellins is an example of_________________?


aGrowth inhibitor


bGrowth stimulator


cGrowth hormone


dNone of these


View Answer Growth stimulator

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


aThey are multinucleated.


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


cThey contain O2 storing molecules called hemoglobin.


dTheir cytoplasm contains high concentration of carbohydrates



Epinasty is controlled by_____________?


aGibberellins


bAbscisins


cAuxins


dCytokinins


View Answer Auxins

Why skeletal muscles are called striated muscles?


aThey appear darker than smooth muscles by naked eye.


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


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


dAll of these



Roots of a plant show______________?


aPositive phototropism and negative geotropism


bNegative phototropism and positive geotropism


cNegative tactic movement and positive tropic movement


dPositive geotropism of stem and roots



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


aA smooth muscle


bA cardiac muscle


cA skeletal muscle


dAll of these


View Answer A smooth muscle

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


aTurgor movement


bNastic movement


cTropic movements


dGrowth movement


View Answer Turgor movement

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