With reference of absorption of minerals, the term 'outer space' represents_____while 'inner space' represents_____.

Options

A. Intercellular space and cell wall, space and cell wall
B. cytoplasm and vacuole, intercellular space and cell wall
C. intercellular space, vacuole
D. cytoplasm, vacuole

Answer

A

Explanation

There are two phases during the process of ion absorption in the initial phase there is a rapid uptake of ions into outer or free space of the cells. Outer or free space comprises intercellular spaces and cell walls (i.e., apoplast). Ions absorbed in free space are freely exchangeable, e.g., replacement of unlabelled `K^(+)` ions with labelled `K^(+)` ions. in the metabolic phase, the ions pass into inner space. the latter comprises cytoplasm and vacuole (i.e., symplast). in the inner space the ions are not freely exhangeable with those of external medium. Entry of ions into outer space in passive absorption as no energy is requried for it. Absorption of ions. into inner space requried metabolic energy, which is therefore, an active absorption.