Transport in Plants (Biology) Question Bank - Class 11

Q1.

If a cell $A$ with $DPD$ $4 \, \text{bars}$ is connected to cells $B$, $C$, and $D$ whose $OP$ and $TP$ are respectively $(4, 4)$, $(10, 5)$, and $(7, 3) \, \text{bars}$, the flow of water will be:

(A)

$A$ and $D$ to $B$ and $C$

(B)

$A$ to $B, C$ and $D$

(C)

$B$ to $A, C$ and $D$

(D)

$C$ to $A, B$ and $D$

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Q2.

If the rates of transpiration and water absorption of a flowering plant are measured over a period of $24$ hours,it is found that the rate of transpiration reaches its peak at about mid-day and then declines,whereas the peak for water absorption is reached approximately two hours later. Which one of the following statements provides the best explanation of these results?

(A)

There is a temporary reduction of light intensity at mid-day,which reduces the rate of transpiration.

(B)

Water absorption is mainly due to root respiration and this is affected by soil temperature,which does not reach a maximum for some hours after the maximum air temperature has been reached.

(C)

The high rate of transpiration causes a water deficit which results in stomatal closure and an increased concentration of leaf cell sap,which in turn causes continued water uptake.

(D)

The high light intensity results in high internal oxygen concentrations and so increases water uptake.

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