(B) Diffusion is the process by which molecules move from a region of higher concentration to a region of lower concentration. In plants,the exchange

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(B) Diffusion is the process by which molecules move from a region of higher concentration to a region of lower concentration. In plants,the exchange of gases like $O_2$ and $CO_2$ between the internal tissues and the external environment occurs primarily through the stomata and lenticels via the process of diffusion.

Class 11 Biology Breathing and Exchange of Gases Exchange of gases

Easy

Gaseous movement into and out of the plants occurs indirectly through

A
Osmosis
B
Diffusion
C
Transpiration
D
Imbibition

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Class 11 Questions

Class 11

Biology Questions

Chapter

Breathing and Exchange of Gases

Subtopic

Exchange of gases

Match the Column-$I$ with Column-$II$ regarding the partial pressures of gases ($PO_2$ and $PCO_2$) in different respiratory sites:

Column-$I$ Column-$II$

$A$. Alveoli $i$. $0.3 \ mmHg \ PCO_2$

$B$. Deoxygenated blood $ii$. $45 \ mmHg \ PCO_2$

$C$. Atmospheric air $iii$. $104 \ mmHg \ PO_2$

$D$. Tissue $iv$. $40 \ mmHg \ PO_2$

Column-$I$	Column-$II$
$A$. Alveoli	$i$. $0.3 \ mmHg \ PCO_2$
$B$. Deoxygenated blood	$ii$. $45 \ mmHg \ PCO_2$
$C$. Atmospheric air	$iii$. $104 \ mmHg \ PO_2$
$D$. Tissue	$iv$. $40 \ mmHg \ PO_2$