Dry seed when submerged in water soon swell up. why?

Explanation:

Dry seed, when submerged in water, soak in the water. As they do so, they swell up. When the seed swells up, the seed coad splits and the seed germinates.

Germinates- when a seed grows and form shoots (where leaves start developing)

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.