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Choose the correct statement
The movement of ions into apoplast is an active process
Movement of ions into apoplast occurs through ion channels, transmembrane proteins etc.
The entry or exit of ions to and from the symplast occurs without the expenditure of metabolic energy
In the first phase of ion uptake, an initial rapid uptake of ions into the ‘outer space of cells – the symplast, is passive.
Answers (1)
In the first phase, an initial rapid uptake of ions into the ‘free space’ or ‘outer space’ of cells – the apoplast, is passive. The passive movement of ions into the apoplast usually occurs through ion-channels, the trans-membrane proteins that function as selective pores. On the other hand, the entry or exit of ions to and from the symplast requires the expenditure of metabolic energy, which is an active process. Hence, the correct answer is option b.
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