Which of the following are objections to the | vedclass

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(D) The root pressure theory faces several objections:$1$. It cannot explain the ascent of sap in tall trees (taller than $20 \ m$) because the magnit

Vedclass · Accepted Answer

$I, II, III$ and $V$ only

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(D) The root pressure theory faces several objections:$1$. It cannot explain the ascent of sap in tall trees (taller than $20 \ m$) because the magnitude of root pressure is insufficient to push water to such heights.$2$. Ascent of sap continues even when the root system is removed or absent,indicating that roots are not the only source of upward movement.$3$. In tall gymnosperms,root pressure is often measured to be near zero.$4$. Root pressure is not observed in actively transpiring plants because the rapid loss of water creates a tension that overrides the positive pressure.Statement $IV$ is a misconception rather than an objection to the theory itself. Therefore,the valid objections are $I, II, III$,and $V$.

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