Science Vocab. - 45 terms
Terms
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- flower
- the reproductive structure of an angisperm
- root cap
- a structure that covers the tip of a root, protecting the root from injury
- photoperiodism
- a plants response to seasonal changes in lenght of night and day
- seed
- the plant structure that contains a young plants inside a protective covering
- germination
- the spreading of the embryo from a seed that occurs where the embryo resumes growth
- xylem
- the vascular tissue through which water and nutrients move in some plants
- transpiration
- the process by which water is lost through a plants leaves
- ovule
- a structure that contains an egg cell
- hormone
- a chemical in and organism that produces a specific effect such as growth or development
- short-day plant
- a plant that flowers when the nights are longer then the plant's critical night length
- day-neutral plant
- a plant with a flowering cycle that is not sensetive to periods of light or dark
- cambium
- a layer of a cell in a plant that produces new xylem and phloem cells
- long-day plant
- a plant that flowers when the night's are shorter then the plants critical night length
- rhizoid
- a thin robot-like structure that anchors a moss and absorbs water and nuitrients
- frond
- the leaf of a fern plant
- critical night length
- the number of hours of darkness that determines wether or not a plant will flower
- biennal
- a flowering plant that completes it's life cycle in two years
- angiosperm
- a flowering plant that produces seeds enclosed in a reproductive structure
- nonvascular plant
- a low-growing plant that lacks true vascular tissue
- fruit
- the ripened ovary of an angiosperm that encloses one or more seeds
- pistil
- the female reproductive part of a flower
- ovary
- a flower structure that encloses and protects ovules and seeds as they develop; Organ of the female reproductive system in which eggs nd estrogen are produced
- zygote
- a fertilized egg, produced by the joing of a sperm and an egg
- cuticle
- the waxy, waterproof layer that covers the leaves and stems of most plants
- vascular tissue
- the internal transporting tissue in some plants that is made up of tubelike structures
- petal
- a colorful leaf-like structure of some flowers
- cone
- the reproductive structure of a gymnosperm
- pollination
- the transfer of pollen from male reproductive structure to a female reproductive structure in plants
- embryo
- a young organism that develops from a zygote; a developing human during the first 8 weeks after fertilization
- stamen
- a male repeoductive part of a flower
- sporophyte
- the stage in the life-cycle of a plant in which the plant produces spores
- monocot
- an angiosperm with one seed leaf
- dicot
- an angisperm with two seed leaves
- cotyledon
- a seed leaf
- sepal
- a leaf-like structure that encloses the bud of the flower
- gameophyte
- the stage in the life cycle of a plant in which the plant produces gametes, or sex cells
- pollen
- tiny particles (male gameophytes) produced by seed plants that contain the cells that later become sperm cells
- annual
- a flowering plant that completes its life cycle in one growing season
- auxin
- a plant hormone that speeds up the rate of growth in a plants cells
- gymnosperm
- a plant that produces seed that are not enclosed by a protective fruit
- dormancy
- a period when an organism's growth or activity stops
- tropism
- the growth response of a plant towards ar a way from a stimulus
- perennial
- a flowering plant that lives for more then two years
- phloem
- the vascular tissue through which food moves in some plants
- vascular plant
- a plant that has true vascular tissue