Diffusion
Diffusion
Transport of substances by diffusion
· When gases like carbon dioxide and oxygen accumulate inside the cell, their concentration is greater inside compared to the external environment. Due to this difference in concentrations, their net movement is to the outside by diffuse, i.e., from their region of higher concentration to lower concentration.
· Similarly, when the concentration is greater outside, O2 and CO2 move inside the cell from the external environment following the principle of diffusion. In unicellular organisms, transport of gases by diffusion occurs all over the cell membrane, e.g., Chlamydomonas, Paramecium, Amoeba, etc. In multicellular organisms like Hydra and sponges, transport of oxygen and nutrients also takes place through diffusion.
Which of the following are correct : (a) Passive transport is the movement of a solute from a region of high concentration to a region of low concentration. (b) Active transport is the movement of a solute from a region of high concentration to a region of low concentration. (c) Active transport is the type of transport in which there occur movement of substances from region of low concentration to high concentration against the concentration gradient. | |||
| Right Option : C | |||
| View Explanation | |||
Transport of gases inside the cell is done with the help of which type of process ? | |||
| Right Option : B | |||
| View Explanation | |||
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