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  • Classify the following into osmosis 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

Classify the following into osmosis/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 pickles in salt.

(f) Spreading of smell of cake being baked through out the house.

(g) Aquatic animals using oxygen dissolved in water during respiration.

Answers (1)

Ans. (a)(c)(d)(e) – Osmosis    (b)(f)(g) - Diffusion

Sol.

A) When a raisin is kept in water, the water concentration will be smaller in raisins. Therefore, through the semipermeable membrane of raisin, water goes into the raisin. This is defined as Osmosis.

Due to excess of water the phenomenon of swelling occurs.

B) The concentration of virus in the air which comes out from the mouth during sneezing is very high.

These viruses get diffused in the ambient because of difference in concentration.

C) In salty water, due to osmosis, water from body of earthworm comes out. This leads to bursting of cells in body of earthworm and it dies.

D) When grapes are kept in thick sugar syrup, the water concentration will be less in sugar syrup. Due to osmosis, water from grapes comes out to the sugar syrup and the grapes shrink in this process.

E) Due to salt water from fruits or vegetables comes out by process of osmosis. This prevents oxidation of fruits and vegetables. Therefore, these pickles can be preserved for long.

F) When we bake a cake, the smell contained particles diffuse in ambient atmosphere. This occurs due to diffusion: particles move from high to low concentration.

G) Aquatic animals use oxygen, dissolved in water during respiration. This water has higher concentration of oxygen than blood. This difference in concentration causes diffusion of oxygen in to the blood.

Posted by

Gurleen Kaur

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