You are looking at the tomatoes on your plants in a pot at your kitchen window,...
You are looking at the tomatoes on your plants in a pot at your kitchen window, and think about how the plant cells acquire the sucrose they need. The transport of sucrose across cell membranes in plants is an example of [2 marks]
A facilitated diffusion
B transport of sucrose against its concentration gradient
C passive diffusion of the non-polar sucrose molecules
D co-transport of sucrose coupled with Na+/K+-ATPase
E endocytosis to accumulate sucrose inside the cel
Homework Answers
The sucrose is a polar compound. That's why it can not pass through cell membranes via passive transport. The sucrose is translorted across cell membranes via two ways:
* Plasmodesmata: this plasmodesmata allows transport of sucrose mioecule by symplastic movement.
* By cell membrane: In this case, sucrose- H+ symporter are used. The proton gradient is generated by H+ ATPase via cell membrane.
Similarly sucrose is also transport across cell membrane by means of faciliated transport. In this case, sucrose is transported across plasma membrane by means of specific protein without utilisation of energy.
That's why most appropriate option is A. ( facilitated diffusion) .
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