2021-09-07 06:32:39
Main parts of pistils
(i) Stigma receives pollen grains.
(ii) Style is the elongated slender part beneath the stigma.
(iii) Ovary the bulged part at the base of style.
Placenta is located inside the ovarian cavity or locule. Megasporangia, commonly called ovules arise from the placenta. Ovule is attached to the placenta by a stalk called funicle. The number of ovules in an ovary may be one (wheat, paddy and mango) to many (papaya, water melon and orchids).
The main parts of megasporangium (ovule) are:
(i) Hilum is a junction between ovule and funicle.
(ii) Each ovule has one or two protective envelopes called integuments.
(iii) Micropyle is an opening present at the tip where integument is absent.
(iv) Chalaza is opposite to the micropylar end representing the basal part of the ovule.
(v) The integuments encloses a mass of cells called the nucellus which have food reserves.
(vi) Embryo sac or female gametophyte is located in the nucellus (generally one formed from megaspores througth reductional division)
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