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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