Elementary botany . .,) a portion Of of fertilization in angiosperm. f, funicle of ovule; J7 / r n, nucellus; in, micropyle; o, antipodal cells or the nucellus remains in- embryo sac ; e, endosperm nucleus ; /-egg cell and synergids ; at, outer integument of ovule ; z/, innertact in the mature Seed, integument. The track of the pollen tube is shown down through the style, walls of the ovary to the In such seeds the remain- mkropyiar end of the embryo portion of the nucellus is the perisperm. 662. Presence or absence of endosperm in the seed.—Inmany of the angiosperms all of the endospe
Elementary botany . .,) a portion Of of fertilization in angiosperm. f, funicle of ovule; J7 / r n, nucellus; in, micropyle; o, antipodal cells or the nucellus remains in- embryo sac ; e, endosperm nucleus ; /-egg cell and synergids ; at, outer integument of ovule ; z/, innertact in the mature Seed, integument. The track of the pollen tube is shown down through the style, walls of the ovary to the In such seeds the remain- mkropyiar end of the embryo portion of the nucellus is the perisperm. 662. Presence or absence of endosperm in the seed.—Inmany of the angiosperms all of the endosperm is consumed bythe embryo during its growth in the formation of the seed. Thisis the case in the rose family, crucifers, composites, willows, oaks,legumes, etc., as in the acorn, the bean, pea and others. Insome, as in the bean, a large part of the nutrient substance pass- 332 MORPHOLOGY. ing from the endosperm into the embryo is stored in the cotyle-dons for use during germination. In other plants the endosperm. Fig. 397- Fig. 398. Section of one end of ovule of trillium, showing Embryo e n - young embryo in endosperm. larged. is not all consumed by the time the seed is mature. Examples oftins kind are found in the buttercup family, the violet, lily, palm,
Size: 1857px × 1345px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
