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Science chap.10
Sexual Reproduction
| Question | Answer |
|---|---|
| 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. |
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