Question
Biology Question on Cell: the unit of life
Vacuole in a plant cell
A
lacks membrane and contains air
B
lacks membrane and contains water and excretory substances
C
is membrane-bound and contains storage proteins and lipids
D
is membrane-bound and contains water and excretory substances.
Answer
is membrane-bound and contains water and excretory substances.
Explanation
Solution
In a plant cell, vacuole may be defined as a non-living reservoir, bounded by a differentially or selectively permeable membrane, the tonoplast. It is filled with a highly concentrated solution called vascular sap or cell sap which contains many dissolved solutes such as organic acids, soluble carbohydrates, soluble nitrogenous compounds as nitrates, enzyme, tannins, chlorides, phosphates, amino acids, alkaloids and anthocyanin pigments.