(C) Seeds are covered by a hard seed coat called the testa. However,they require oxygen for respiration during germination. The respiratory gases ($O_

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(C) Seeds are covered by a hard seed coat called the testa. However,they require oxygen for respiration during germination. The respiratory gases ($O_2$ and $CO_2$) enter and exit the seed primarily through a small pore known as the micropyle. Therefore,the micropyle serves as the site for respiratory exchange in seeds.