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In which of the following forms is iron absorbed by plants?

1. (a) Ferric
2. (b) Ferrous
3. (c) Both ferric and ferrous
4. (d) Free element

Correct answer: (c) Both ferric and ferrous

Solution

Plants can absorb iron in more than one ionic form depending on soil conditions and root chemistry. Both ferric (Fe3+) and ferrous (Fe2+) forms can be taken up, which is why the correct choice includes both.

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