HORTICULTURE

Detailed explanation-1: -Glycine is the only amino acid that is not optically active because it does not have a carbon chiral center. In order for a carbon to to be a chiral center, it must have 4 different R-groups attached to it.

Detailed explanation-2: -Glycine has no chiral center. So, it is optically inactive.

Detailed explanation-3: -Those amino acids that have a chiral centre will be optically active, while those without a chiral carbon centre will be optically inactive. So it is optically active. so it is not optically active. Hence, glycine is not optically active.

Detailed explanation-4: -Glycine is the simplest amino acid. It is different from all the other amino acids because it is the only amino acid which do not have asymmetrical carbon atom. Hence, glycine is optically inactive.

Detailed explanation-5: -Glycine is the only chiral amino acid with a single hydrogen atom as its side chain. The absence of asymmetric carbon atoms makes glycine optically inactive that means glycine does not rotate the plane polarised light.