Question

In many unicellular organisms waste products are removed by the process of?

Answer 1

Hint: Removal of waste products also termed the excretion is a process that helps in the removal of metabolic wastes from the body. Accumulation of these wastes inside the body is known to be harmful to the organism.

Complete answer:
Multicellular organisms have developed many advanced methods for the removal of wastes from their body depending on their habitat as well as their lifestyle. But unicellular organisms are unable to develop such complex mechanisms as a result of which the process by which the unicellular organisms remove waste is simple diffusion.

Diffusion is defined as the movement of substances from a region of higher concentration to a region of lower concentration. Due to the metabolic activities of the unicellular organisms, the waste products start accumulating inside them and after a given point of time, the concentration of waste product inside the cell is much higher than the external environment which facilitates diffusion.

Diffusion is said to occur directly by crossing the cell membrane and no special mechanisms is required for it. Some unicellular organisms also carry out waste removal through the help of contractile vacuoles which consists of lysosome that digests the waste. The wastes enter the contractile vacuole which then moves towards the plasma membrane where they burst open releasing the contents outside the cell.

Note: Thus red rot disease being highly harmful should be controlled so that sugarcane crops are not destroyed as they have high commercial value. To prevent red rot seeds should be taken from disease-free nurseries and carefully examined before they are grown. Those seeds that show little reddening should be discarded immediately.