In Ricinus, the outer white papery covering of endosperm is
Ricinus communis, the castor bean or castor oil plant, is a species of perennial flowering plant in the spurge family, Euphorbiaceae. Castor seed is a monocot, endospermic seed. A castor seed has following parts:
(i) Testa: It is the outer layer of seed coat. It is thick, hard and brittle. The external surface appears smooth, shinning and mottled brown in colour.
(ii) Tegmen: It is the inner layer of seed coat that appears dull and papery. Now it is called as perisperm or persistent nucellus.
(iii) Caruncle: It is a white spongy bilobed outgrowth present near the narrow end of the seed.
(iv) Raphae: It is a shallow ridge present on the testa of flat surface of the seed. The distinct bifurcation of raphae represents chalaza.
(v) Endosperm: It is a white oily food storage tissue that is present inner to the perisperm. From this layer castor oil of commerce is extracted.
(vi) Embryo: Embryo lies in the centre of endosperm.
So, the correct answer is ‘Perisperm/ Tegmen’.