Question

Purple cabbage leaves do not lose their color in cold water but do so in boiling water because
a) Plasma membrane get inactivated in boiling water
b) Hot water can enter the cells readily
c)The pigment is not soluble in cold water
d)The cell wall is killed in boiling water

Answer 1

Hint: The plasma membrane of the cauliflower has pigment present which is of a class reddish-purple pigment known as anthocyanin. This pigment is responsible for the characteristic color of the purple cabbage. Cell membranes provide the structural support and control the movement of the materials through the cells.

Complete answer:
Purple cabbage loses its color when placed in boiling water because the plasma membrane gets inactivated in the boiling water. As the temperature increases, the pigment color of the cabbage also increases. When it is placed in the boiling water the plasma membrane gets inactivated and it leads to them losing their color.

Additional information:
The components of the plasma membrane are phospholipids, proteins, and carbohydrates. It helps in the protection of the internal components of the cell. It also helps in the movement of particles in and out of the cell. It also plays a role in the anchoring of the cytoskeleton to provide the shape of the cell. The particles pass through the membrane by either passive or active diffusion. Active transportation requires the cell to spend energy and the passive transport requires no cell energy.

So, the answer is ‘plasma membrane gets inactivated in the boiling water’.

Note: Plasma membrane of the purple cabbage is present with a characteristic color that imparts purple color to it. The temperature in which cabbage grows regulates its color. When cabbage is boiled in the warm water the plasma membrane becomes inactivated due to which it starts losing its purple color and makes the water purple.