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Question
Various types of transport mechanisms are needed to fulfil the mineral requirements of a plant. Why are they not fulfilled by diffusion alone?
Short Note
Solution
Plants also require mineral nutrients and charged ions like potassium, sodium, etc. which cannot be transported via simple diffusion because the cell membrane which is selectively permeable does not allow large, polar and charged particles through.
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Means of Transport in Plants - Comparison of Different Transport Processes
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When the movement of two molecules say 'A' and 'B' by a transport protein is independent of each other, it is known as
Given below is a table. Fill in the gaps
| Property | Simple diffusion | Facilitated transport | Active Transport |
| i Highly selective | ______ | Yes | ______ |
| ii Uphill transport | ______ | ______ | Yes |
| iii Requires ATP | ______ | ______ | ______ |
Identify a type of molecular movement which is highly selective and requires special membrane proteins, but does not require energy.
