Which among the following statements is/are true?
I. All dicots have endospermic seeds.
II. All monocots have endospermic seeds.
III. Endosperm is triploid in angiosperms.
IV. Most dicots and some monocots have endospermic seeds.

The correct option is C III only
Endosperm is a nutritive tissue that provides nutrition to the developing plant embryo.

Endospermic seeds have endosperm in the mature seed.

Statement I is incorrect as all dicot seeds are not endospermic. Example: pea and groundnut are dicot plants that lack endosperm in the mature seed.

Statement II is incorrect as certain monocot seeds lack endosperm at maturity. Example: orchids.

Statement III is correct as endosperm in angiosperms is triploid. Endosperm is formed in the triploid cell of embryo sac, PEC. The PEC has a triploid nucleus, PEN formed as a result of fusion of three haploid nuclei (2 polar nuclei and one nucleus of male gamete).

Statement IV is incorrect as most of the monocot seeds and few dicot seeds have endosperm at maturity.

Most of the dicot seeds are non-endospermic with few exceptions like castor seeds which are endospermic.

Most of the monocotyledonous seeds are endospermic except orchids which are non-endospermic.