Events occurs first in seed germination is Water is taken up.
Rapid water uptake by the seeds during the early stages of germination causes swelling and optimal temperature-induced softening of the seed coat. Imbibition is the name given to this phase. Enzymes are activated to begin the growth process. The seed starts to produce proteins, respire, and metabolize the food that has been stored after activating its internal physiology. This is the seed germination lag phase. The seed coat bursts, allowing the radicle to emerge and develop into a primary root. The seed begins to take up water from underground. After the radicle and plumule have emerged, the shoot begins to ascend.
The seed cell lengthens, divides, and becomes metabolically active in the last stage of seed germination to produce the seedling.
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