Answer :
When the sucrose concentration in the water surrounding the capillary tube is increased, the height of the water in the capillary tube decreases due to osmosis, where water molecules move from an area of lower solute concentration (inside the tube) to an area of higher solute concentration (outside the tube).
What happens to the water
Conversely, if the sucrose concentration is decreased, the height of the water in the capillary tube increases as water moves inwards through osmosis.
This is because the lower concentration of solute particles outside the capillary tube creates a higher concentration of water molecules inside the capillary tube, causing the water to move inwards (osmosis) and increase the height of the water column.
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