water against the seed coat. air pushing on the seed. gravity on the seed. soil pressing on the seed.
I gave my students this multiple choice question: A root emerges from a seed because of the force of

Only one answer is correct among these 4 choices:
- water against the seed coat.
- air pushing on the seed.
- gravity on the seed.
- soil pressing on the seed.

Could you tell me which one is correct?

water against the seed coat.