Crassinucellate ovule hasA. III developed nucellusB. Partially developed nucellusC. Well- developed nucellusD. No nucellus

Answer: C. Well-developed nucellus
A crassinucellate ovule is characterized by a well-developed nucellus. The nucellus is the central part of the ovule that contains the developing embryo sac and is responsible for the nourishment of the developing seed.
1. Crassinucellate Ovule:
o The term "crassinucellate" refers to the presence of a thick, well-developed nucellus in the ovule. In this type of ovule, the nucellus is typically large and provides nourishment to the developing embryo sac.
o This is in contrast to other types of ovules, such as tenuinucellate ovules, where the nucellus is thin.
2. Why other options are incorrect:
o A. III developed nucellus: This option is unclear and not a correct classification for the nucellus in crassinucellate ovules.
o B. Partially developed nucellus: In crassinucellate ovules, the nucellus is well-developed, not partially developed.
o D. No nucellus: Ovules do have a nucellus, even in crassinucellate forms.
Thus, the correct answer is C. Well-developed nucellus, as crassinucellate ovules are characterized by a thick and well-developed nucellus.