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The two coverings of the ovule are called the inner and outer coats.

Orthotropous Ovule in Section

The two coverings of the ovule are called the inner and outer coats.

A shows the nucellus alone. B shows the inner coat. C hows both coats growing to cover nucellus.

Three Stages in Growth of Orthotropous Ovule

A shows the nucellus alone. B shows the inner coat. C hows both coats growing to cover nucellus.