What causes water to enter the egg and cause the egg to swell and burst is osmosis. Option D is correct.
Osmosis is a process that happens when the concentration of solute in one place is higher than in the other, this causes water to move towards the place with the higher concentration of solute in order to dissolve it. In this case. the situation would be:
- The sea urchin egg is in the ocean
- The ocean is salt water, so the egg contains water with salt in it (salt is a solute)
- The egg is placed in freshwater (meaning this water does not have salt)
- Because the water on the outside of the egg has no salt, the concentration of solute in the egg (salt), causes Osmosis to occur.
- Through Osmosis, water enters the egg until it swells and then bursts.
Therefore, because the egg has more solute, Osmosis causes the water to enter the egg until it bursts.
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