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Science chap.10

Sexual Reproduction

cotyledons the primary or rudimentary leaf of the embryo of seed plants.
egg female sex cell, nucleus
embryo any multicellular animal in a developmental stage preceding birth or hatching.
external fertilization in some aquatic species, the male's sperm swims to , and unites with, the female's eggs outside her body
fertilization the union of male and female gametic nuclei.
fruit ripened ovary of a flower
germinate to develop into a plant or individual, as a seed, spore, or bulb.
internal fertilization type of fertilization in which sperm cells are deposited by the male inside the female, where they unite with and ferilize an egg
life cycle a series of stages, as childhood and middle age,
metamorphosis .a profound change in form from one stage to the next in the life history of an organism, as from the caterpillar to the pupa and from the pupa to the adult butterfly
ovary the female gonad or reproductive gland, in which the ova and the hormones that regulate female secondary sex characteristics develop
oviducts either of a pair of tubes that transport the ova from the ovary to the exterior, the distal ends of which form the uterus and vagina in higher mammals
ovules the plant part that contains the embryo sac and hence the female germ cell, which after fertilization develops into a seed
petals parts of a flower that are usually brightly colored
pistil the ovule-bearing or seed-bearing female organ of a flower, consisting when complete of ovary, style, and stigma
pollen grains a single granule of pollen.
pollen tube the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule
pollination the transfer of pollen from the anther to the stigma
seed the fertilized, matured ovule of a flowering plant, containing an embryo or rudimentary plant.
sepals one of the individual leaves or parts of the calyx of a flower
sex cell a spermatozoon or an ovum; gamete
sex glands special glands that produce the sex cells and secrete the sex hormones; testes and ocaries
sexual reproduction reproduction involving the union of gametes
spawning mass of eggs deposited by fishes, amphibians, mollusks, crustaceans, etc.
sperm a male reproductive cell; spermatozoon
sperm ducts thin tubes that lead sperm cells from the testes to the outside of a male's body
stamens the pollen-bearing organ of a flower, consisting of the filament and the anther
testis the male gonad or reproductive gland, either of two oval glands located in the scrotum.
yolk the part of the contents of the egg of an animal that enters directly into the formation of the embryo, together with any material that nourishes the embryo during its formation.
Created by: daisy37311