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Diffusion

Classify the ...

Question

Classify the following into osmosis/diffusion.
Aquatic animals using oxygen dissolved in water during respiration.

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Solution

Aquatic respiration is the process whereby an aquatic animal obtains oxygen from water. This is done using diffusion of oxygen. Fish use the process known as countercurrent flow in which water and blood flow in opposite directions across the gills, maximizing the diffusion of oxygen.

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Q. Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
(a) swelling up of a raisin on keeping in water
(b) spreading of virus on sneezing
(c) earthworm dying on coming in contact with common salt
(d) shrinking of grapes kept in thick sugar syrup
(e) preserving of pickles in salt
(f) spreading of smell of cake being baked in the kitchen
(g) aquatic animals using oxygen dissolved in water during respiration

Q. Question 17
Classify the following into osmosis/diffusion
Solution:
1. Swelling up of a raisin on keeping in water.
2. Spreading of virus on sneezing.
3. Earthworm dying on coming in contact with common salt.
4. Shrinking of grapes kept in thick sugar syrup.
5. Preserving pickles in salt.
6. Spreading of smell of cake being bakedthrough out the house.
7. Aquatic animals using oxygen dissolved in water during respiration.

Q. Question 17
Classify the following into osmosis/diffusion
Solution:
1. Swelling up of a raisin on keeping in water.
2. Spreading of virus on sneezing.
3. Earthworm dying on coming in contact with common salt.
4. Shrinking of grapes kept in thick sugar syrup.
5. Preserving pickles in salt.
6. Spreading of smell of cake being bakedthrough out the house.
7. Aquatic animals using oxygen dissolved in water during respiration.

Aquatic animals use dissolved _________ in water for respiration.

Q. Aquatic animals use dissolved in water for respiration.

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