Biology MCQs

Page No. 25

Stomatal transpiration is __________ of total transpiration


a90%


b91%


c93%


d95%


View Answer 90%

A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called___________?


aTranspiration pull


bRoot pressure


cOsmotic pressure.


dNone of these


View Answer Root pressure

Pulling upward of water and dissolved minerals towards the leaves through the xylem tissue is called__________?


aTranspiration pull


bRoot pressure


cAscent of sap.


dAll of these


View Answer Transpiration pull

Transport of minerals from soil to epidermal cells of roots via carrier protein molcules along their concentration gradient is called___________?


aDiffusion.


bFacilitated diffusion.


cPassive transport.


dActive transport.



Lenticels look like__________?


aA big pore


bStoma


cSponge


dCars or small protusions



Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are___________?


aHydathods


bStomata


cLenticels


dNone of these


View Answer Lenticels

Which of the following are proteins in nature?


aAntibodies


bInterferons


cAntitoxins


dAll of these


View Answer All of these

Cooley’s anemia is another name used for___________?


aLeucemia


bThalassaemia


cSickle cell anemia


dNone of these


View Answer Thalassaemia

Tricuspid valve is present_____________?


aBetween right atrium and right ventricle


bBetween left atrium and left ventricle


cAt base of pulmonary artery


dAt base of aorta



QRS complex represents____________?


aAtrial systole


bVentricular systole


cAtrial diastole


dVentricular diastole


View Answer Ventricular systole

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