Chapter 11: Problem 70
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Chapter 11: Problem 70
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The type of diffusion in which substances move across the membrane along their concentration gradient in the presence of certain carriers ar transport proteins is calied as (a) simple diffusion (b) facilitated diffusion (c) asmosis (d) active transport.
The transpiration-driven ascent of xylem sap depends mainly upon property of water. (a) cohesion (b) adhesion (c) surface tension (d) all of these
A flowering plant is planted in an earthen pot and irigated. Urea is added in high amounts to make the plant grow faster, but after some time the plant died. This may be due to (a) exosmosis (b) endosmosit (c) water logging (d) suffocation
Water moves up against gravity and even for a tree of \(20 \mathrm{~m}\) height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is (a) cohesive forces (b) adhesive forces. (c) transpiration pull (d) root pressure
Movement of the molecules of solids, gases or liquids from the region of their higher concentration to the region of their lower concentration is known as (a) diffusion (b) osmosis (c) imbibition (d) active transport.
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