Biology MCQs

Page No. 23

Which of the following represents osmoregulatory steps taken by hydrophytes?


aIncreases transpiration by increasing the surface area of the leave.


bSmall and thick leaves to decrease the surface area proportional to the volume of the leave.


cStomata closing in sufficient supply, and opening in restricted supply of water.


dNone of these



The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called________?


aHomeostasis


bHemostasis


cOsmoregualtion


dThermoregulation


View Answer Osmoregualtion

Fishes, most of the invertebrates and amphibians are examples of ________ animals?


aEndotherms


bEctotherms


cHeterotherms


dHomeotherms


View Answer Ectotherms

Formation of heat shock proteins in plants results in___________?


aElevation of temperature in cold conditions.


bEmbracing the enzymes and other proteins and prevent their denaturation.


cChange the chemical nature of other proteins thus making them heat resistant.


dHelp in evaporative cooling.



Panting is a representative of which mechanism?


aPigmentation


bRespiration


cEvaporative cooling.


dExcretion


View Answer Evaporative cooling.

Brown fat present in certain mammals is specialized in___________?


aProviding insulation in cold environment.


bProviding insulation in hot environment


cRapid heat production.


dControlling heat production.



It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.


a35%


b45%


c55%


d75%


View Answer 55%

Which of the following is true about hearts of earthworm?


aThere are 5-7 pairs of heart.


bThey are present between 1-7th segments.


cThey are present lateral to the oesophagus.


dThey pump blood from ventral to dorsal vessel.



Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis


aDiffusion


bActive transport


cOsmosis


dAll of these


View Answer Active transport

Single circuit heart is found in_________?


aFishes


bAmphibians


cReptiles


dMammals


View Answer Fishes

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