The diffusion rate of oxygen in the air is…………. times more than the diffusion rate of oxygen in the water.
(a)100
(b)1000
(c)10000
(d)100000

Hint: Diffusion is the process of movement of substances from the area of high concentration towards the area of low concentration. The rate of diffusion is inversely proportional to the density of substances.

Complete step by step answer:
The diffusion rate of oxygen in the air is 100000 times more than the diffusion rate of oxygen in the water. Diffusion is the movement of an atom, ions, molecules from a region of higher concentration to a region of lower concentration, the process continues until the equilibrium is reached. It is driven by a gradient in concentration. The diffusion in gases is much faster than in liquids because of the presence of more intermolecular spaces in gases as compared to the liquid.
The word diffusion derives from the Latin word, diffundere, which means "to spread out." In cellular transport in plants, an important role is being played by the process of diffusion of substances.
The diffusion process occurs in both liquids and gases and can take place over long distances.
The diffusion rate is affected by many factors such as the concentration gradient, membrane permeability, temperature, and pressure. Diffusion may be defined as the process of movement of gases, liquids, or solutes from the region of higher concentration to the region of lower concentration till the molecules or solutes. The diffusion of substances can occur simultaneously in different directions and at different rates in the same place without interfering with each other. Thus the diffusion rate of oxygen in the air is 1,00,000 times more than the diffusion rate of oxygen in the water.
So, the correct answer is, ’100000’.

Note:
- The diffusion in gases is much faster than in liquids because of the presence of more intermolecular spaces in gases as compared to the liquid.
- The diffusion process occurs in both liquids and gases and can take place over long distances.
- The rate of diffusion increases with the increase in the membrane permeability and vice- versa.
- The diffusion rate is affected by many factors such as the concentration gradient, membrane permeability, temperature, and pressure.