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20 Cards in this Set
- Front
- Back
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vascular tissue
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plant tissue consisting of ducts or vessels, that, in the higher plants, forms the system (vascular system) by which sap is conveyed through the plant.
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xylem
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a compound tissue in vascular plants that helps provide support and that conducts water and nutrients upward from the roots, consisting of tracheids, vessels, parenchyma cells, and woody fibers.
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phloem
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the part of a vascular bundle consisting of sieve tubes, companion cells, parenchyma, and fibers and forming the food-conducting tissue of a plant
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meristem growth
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vertical growth
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vascular bundle
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a longitudinal arrangement of strands of xylem and phloem, and sometimes cambium, that forms the fluid-conducting channels of vascular tissue in the rhizomes, stems, and leaf veins of vascular plants, the arrangement varying with the type of plant.
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auxin
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a class of substances that in minute amounts regulate or modify the growth of plants, esp. root formation, bud growth, and fruit and leaf drop.
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gibberellins
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Any of several plant hormones, such as gibberellic acid, used to promote stem elongation.
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cytokinins
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Any of a class of plant hormones that promote cell division and growth and delay the senescence of leaves.
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ethylene
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containing the ethylene group.
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abscisic acid
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a growth-regulating plant hormone, C15H20O4, that promotes dormancy and the aging and abscission of leaves.
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embryo
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the young of a viviparous animal, esp. of a mammal, in the early stages of development within the womb, in humans up to the end of the second month.
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seed coat
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The outer protective covering of a seed
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endosperm
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The nutritive tissue within seeds of flowering plants, surrounding and absorbed by the embryo.
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auxin
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a class of substances that in minute amounts regulate or modify the growth of plants, esp. root formation, bud growth, and fruit and leaf drop.
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cotyledons
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Botany A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf.
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phototropism
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phototropic tendency or growth.
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gravitropism
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oriented growth with respect to the force of gravity.
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thigmotropism
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oriented growth of an organism in response to mechanical contact, as a plant tendril coiling around a string support.
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photoperiodism
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the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period.
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hypocotyl
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the part of a plant embryo directly below the cotyledons, forming a connection with the radicle.
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