माइक्रोप्रोपाइल के विपरीत एक पौधे के अंडाकार का बेसल हिस्सा; जहां पूर्णांक और नुेल्लस शामिल हो गए हैं

chalaza's Usage Examples:

cha, Chalaza.

Where, by more rapid growth on one side than on the other, the nucellus, together with the integuments, is curved upon itself, so that the micropyle approaches the hilum,and ultimately is placed close to it, while the chalaza is at the hilum, the ovule is campylotropous (fig.

- Anatropous ovule of Dandelion (Taraxacum), nucellus, which is inverted, so that the chalaza ch, is removed from the base or hilum h, while the micropyle f is near the base.

- Campylotropous ovule of wall-flower (Cheiranthus), showing the funicle f, which attaches the ovule to the placenta; p, the outer, s, the inner coat, n, the nucellus, ch, the chalaza.

I I 1) is the commonest form amongst angiosperms. In this ovule the apex with the micropyle is turned towards the point of attachment of the funicle to the placenta, the chalaza being situated at the opposite extremity; and the funicle, which runs along the side usually next the placenta, coalesces with the ovule and constitutes the raphe (r), which often forms a ridge.

When the ovule is so developed that the chalaza is at the hilum (next the placenta), and the micropyle is at the opposite extremity, there being a short funicle, the ovule is orthotropous.

- Orthotropous ovule of Polygonum in section, showing the embryo-sac s, in the nucellus n, the different ovular coverings, the base of the nucellus or chalaza ch, and the apex of the ovule with its micropyle m.

The point where the integuments are united to the base of the nucellus is called the chalaza (figs.

chalaza's Meaning':

basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined

Synonyms:

plant structure, plant part, ovule,

Antonyms:

artifact, medulla, cortex,