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35 terms

bio unit VII words list 2

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Anther-
flower structure in which the pollen grains are produced
Auxin-
regulatory substance produced in the tip of a growing plat that stimulates cell elongation and the growth of new roots
Bark-
tissues that are found outside the vascular cambium, including the cork cambium, phloem, and cork
Blade-
thin, flattened part of a plant leaf
Capillary action-
tendency of water to rise in a thin tube
Carpel-
innermost part of a flower that produces and shelters the female gametophyte
Cork cambium-
meristematic tissue that produces the outer covering of stems during secondary growth of a plant
Cuticle-
Waxy, protective layer that covers the stems, leaves, and flowers of many plants. Helps prevent water loss.
Cytokinin-
a plant hormone produced in growing roots and in developing fruit and seeds, stimulates cell division
Ethylene-
a plant hormone the stimulates fruit to ripen
Germination-
resumption of growth of the plant embryo following dormancy
Gibberellins-
plant hormone that stimulates growth and may cause dramatic size increase
Guard cell-
specialized cell in the epidermis of plants that controls the opening and closing of stomata
Heartwood-
in a woody stem, the older xylem near the center of the stem that no longer conducts water
Ovule-
structure in seed cones that in which the female gametophytes develop
Palisade mesophyll-
layer of cells under the upper epidermis of a leaf
Petiole-
thin stalk that connects the blade of a leaf to a stem
Pistil-
single carpel or several fused carpels; contains the ovary, style and stigma; the female part
Pollen grain-
structure in a plant that contains the entire male gametophyte in seed plants
Pollen tube-
structure in a plant that contains two haploid sperm nuclei
Pollination-
transfer of pollen from male reproductive structures to the female reproductive structure
Primary growth-
pattern of growth that takes place at the tips and shoots of plants
Sapwood-
in a woody stem the layer of secondary phloem that surrounds the heartwood; usually sctive in fluid transport
Secondary growth-
type of growth in dicots in which the stems increase in thickness
Seed coat-
though covering that surrounds and protects the plant embryo and keeps the contents of the seed from drying out
Spongy mesophhyll-
layer of loose tissue found beneath the palisade mesophyll in a leaf
Spore-
in prokaryotes, protists, and fungi, any of a variety of thick-walled life cycle stages capable of surviving unfavorable conditions
Stamen-
male part of a flower; contains the anther and filament
Stigma-
sticky part at the top of the style; specialized to capture pollen
Stoma-
small opening in the epidermis of a plant that allows CO2, H2O, and O2 to diffuse in and out of the leaf(allows gas exchange)
Transpiration-
loss of water from a plant through its leaves
Transpiration pull-
when water evaporates from the leaves of a plant, water is pulled up to replace what was lost.
Tropism-
movement of a plant toward or away from stimuli
Vascular cambium-
mersitem that produces vascular tissues and increases that thickness of stems
Vein-
in plants, a cluster of vascular tissue in leaves; in animals, a blood vessel that returns blood to the heart