bio unit VII words list 2

35 terms by esmith2468 

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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

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