Biology MCQs

Page No. 24

Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap


aIncreases

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bLowers

✓


cDoesn’t effect

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dMaintains

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View Answer Lowers

Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.


aBacteria

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bViruses

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cFungi

✓


dCyanobacteria

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View Answer Fungi

Low level of CO2 favours _________ of the stomata.


aOpening

✓


bClosure

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cBoth of these

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dNone of these

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View Answer Opening

There are _________ hypothesis which may explain opening and closing of stomata?


aOne

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bTwo

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cThree

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dFour

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View Answer Two

The opening and closing of stomata is directly controlled by the___________?


aTemperature

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bpH

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cLight

✓


dNone of these

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View Answer Light

Pressure flow theory was proposed by_________?


aH-Van Mohl

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bDixon

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cVander wall

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dEarnst Munch

✓


View Answer Earnst Munch

Open circulatory system can contain_________?


aRed Blood Cells

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bWhite Blood Cells

✓


cHaemoglobin

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dAll of these

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View Answer White Blood Cells

95% of the cytoplasm of red blood cells is the___________?


aAntibodies

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bHemoglobin

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cEnzymes

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dProteins

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View Answer Hemoglobin

_________ give rise to macrophages, which destroy larger particles by phagocytosis.


aNautrophils

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bBasophila

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cMonocyte

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dLymphocyte

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View Answer Monocyte

___________ function as multisensory hydraulic valve?


aLenticels

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bGuard cells

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cHydathods

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dAll of these

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View Answer Guard cells

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