(a) Name the process.

(b) Define the above-named process.

(c) What would you observe in the experimental set-up after an hour or so?

(d) What control experiment can be set up for comparison?

(e) Keeping –hair, cell and its surroundings, name the parts that correspond to (1) concentrated sugar solution (2) parchment paper and (3) water in the beaker.

(f) Name any other substance that can be used instead of parchment paper in the above experiment.

(g) Mention two advantages of the process to the plants.

Answers:

(a) Osmosis

(b) The movement of water molecules from their region of higher concentration to their region of lower concentration through a semi-permeable membrane is called as osmosis.

(c) A gradual rise of the sugar solution in the thistle funnel from its initial level after few hours is observed.

(d) Another thistle funnel with plain water filled in it and suspend it in another beaker also containing water can be taken as a control.

(e) (1) Cytoplasm of the root hair cell

      (2) Cell membrane

      (3) Water in the soil

(f) Cellophane paper or animal bladder

(g) The movement of water molecules from their region of higher concentration to their region of lower concentration through a semi-permeable membrane is called as osmosis. The regulation of osmosis in the guard cells of the leaves helps in the opening and closing of stomata.