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Small egg, biologically
Answer for the clue "Small egg, biologically ", 5 letters:
ovule
Alternative clues for the word ovule
Word definitions for ovule in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Ovule \O"vule\, n. [Dim. of L. ovum an egg: cf. F. ovule. Cf. Ovolo , Ovulum .] (Biol.) The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings ...
Usage examples of ovule.
There must sometimes be a physical impossibility in the male element reaching the ovule, as would be the case with a plant having a pistil too long for the pollen-tubes to reach the ovarium.
Although the plants in these experiments appeared perfectly healthy, and although both the ovules and pollen of the same flower were perfectly good with respect to other species, yet as they were functionally imperfect in their mutual self-action, we must infer that the plants were in an unnatural state.
Thus in plants, the office of the pistil is to allow the pollen-tubes to reach the ovules protected in the ovarium at its base.
Of his many important statements I will here give only a single one as an example, namely, that 'every ovule in a pod of Crinum capense fertilised by C.
If we admire the several ingenious contrivances, by which the flowers of the orchis and of many other plants are fertilised through insect agency, can we consider as equally perfect the elaboration by our fir-trees of dense clouds of pollen, in order that a few granules may be wafted by a chance breeze on to the ovules?
As the pollen tube grows the vegetative cell remains in the pollen grain while the generative cell enters the pollen tube and migrates toward the ovule.
The tube contains a haploid (in) generative nucleus and grows downward toward the ovule at the base of the pistils.
Pollen and ovules are formed by reduction divi- sions (meiosis) in which the 10 chromosome pairs fail to replicate, so that each of the two daughter-cells contains one-half of the chromosomes from the mother cell.
And when a pollen grain lands on a pistil and joins with the ovule prepared in the ovary, the two components are united again.
Although the plants in these experiments appeared perfectly healthy, and although both the ovules and pollen of the same flower were perfectly good with respect to other species, yet as they were functionally imperfection their mutual self-action, we must infer that the plants were in an unnatural state.
Soon after fertilization, the pistils wither away as the ovule and surrounding calyx begin to swell.