Question

Examples of tenuinucellate and crassinucellate

Answer 1

central part in ovule in which embryo sac develops.
Nucellus may be quite massive (crassinucellate ovule) or thin (tenuinucellate ovule). It is surrounded by one (unitegmic ovule, e.g., higher dicots) or two (bitegmic ovule, e.g., monocots and primitive dicots) multicellular integuments. Rarely an ovule may be surrounded by three integuments (tritegmic, e.g., Asphodelus) or the integuments are absent (ategmic, e.g., Santalum). Free surfaces of nucellus and integuments are covered by cuticle.