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Answer:
Integuments:
The integument functions in locomotion, breathing and respiration, feeding, excretion, protection from desiccation, behavior, osmoregulation, water control, and as a food reserve.
Nucellus:
Nucellus plays role in sexually reproducing plants. It not only provides nutrients to the embryo; it also protects the embryo from outer harsh atmosphere. There is also a small gap present known as micropyle. The function of micropyle is to absorb water for the embryo to live.
The nucellus is the largest part of the ovule. It houses the embryo sac as well as nutritive tissue and actually remains present in some flowering plants after fertilization as a source of nutrients for the embyo.
Funicle:
Funicle The stalk that attaches an ovule to the placenta in the ovary of a flowering plant. It contains a strand of conducting tissue leading from the placenta into the chalaza.
Synergid cells:
Synergids play some role in guiding the entry of pollen tube into the embryo sac in close vicinity of an egg cell. The two polar nuclei fuse to form a secondary nucleus or definitive nucleus which after an act of double fertilization forms triploid nutritive tissue called endosperm.
Antipodal cells:
The antipodal cells play some role in regulating the act of fertilization and double fertilization.