LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It’s the basic power source for most types of cells
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It allows substances to move across cell membranes
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It prevents toxins from entering our bodies
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Without diffusion, cell division could not take place
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Detailed explanation-1: -Diffusion is important to cells because it allows them to gain the useful substances they require to obtain energy and grow, and lets them get rid of waste products.
Detailed explanation-2: -Plasma membranes act not only as a barrier, but also as a gatekeeper. It must allow needed substances to enter and cell products to leave the cell, while preventing entrance of harmful material and exit of essential material.
Detailed explanation-3: -Definition: The process of movement of a substance (solid, liquid, or gas) from the region of higher concentration to the region of lower concentration so as to spread uniformly is called diffusion. In the process of diffusion the molecules of the one substance mix with the molecule of the other substance.
Detailed explanation-4: -Importance of Diffusion in Plants The exchange of gases through stomata takes place by the process of diffusion. Transpiration occurs by the principle of diffusion. The ions are absorbed by simple diffusion. The food material is translocated by this process.
Detailed explanation-5: -Facilitated diffusion is diffusion that is helped along (facilitated by) a membrane transport channel. These channels are glycoproteins (proteins with carbohydrates attached) that allow molecules to pass through the membrane.