Question

why dry raisins placed in water swell up​

Answer 1

Dry raisins swell up because they undergo Endosmosis. When the raisin is placed in a hypertonic solution i.e. water then the water penetrates through the semipermeable membrane i.e. the skin of the raisin and hence the raisin swells up

Answer 2

Answer:

Dry raisins undergo a process called osmosis. When the raisin is placed in a hypertonic solution i.e. water then the water penetrates through the semipermeable membrane i.e. the skin of the raisin and hence the raisin swells up.