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Dermal tissue

outer covering or "skin" of a plant

ground tissue

tissue between the dermal tissue and vascular tissue of a non-woody plant that functions in photosynthesis, storage, and support


the outer layer of the skin covering the exterior body surface of vertebrates


a small float usually made of cork

sieve tube

tube formed by cells joined end-to-end through which nutrients flow in flowering plants and brown algae


the layer of unmyelinated neurons (the gray matter) forming the cortex of the cerebrum

root hair

thin hairlike outgrowth of an epidermal cell just behind the tip

root cap

thimble-shaped mass of cells covering and protecting the growing tip of a root

vascular bundle

a unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem


the choicest or most essential or most vital part of some idea or experience


hard outer covering or case of certain organisms such as arthropods and turtles


the small openings on the undersides of most leaves through which oxygen and carbon dioxide can move


the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels


(botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed


something that provides an important central source for growth or development

fibrous root

part of a root system in which roots branch to such an extent that no single root grows larger than the rest

adventitious root

root growing in an unusual location e.g. from a stem




flowering plant with two cotyledons


a monocotyledonous flowering plant


nutritive tissue surrounding the embryo within seeds of flowering plants


The ground tissue of a leaf, sandwiched between the upper and lower epidermis and specialized for photosynthesis.


the emission of water vapor from the leaves of plants

apical meristem

Embryonic plant tissue in the tips of roots and in the buds of shoots that supplies cells for the plant to grow in length.

seed germination

a process by which a seed embryo develops into a seedling


seed plant that bears its seeds directly on the surfaces of cones


flowering plants


the part of the stamen that contains pollen


the male reproductive organ of a flower


the female ovule-bearing part of a flower composed of ovary and style and stigma


transfer of pollen from the anther to the stigma of a plant


a skin lesion that is a diagnostic sign of some disease


the gamete-producing individual or phase in the life cycle of a plant having alternation of generations


the spore-producing individual or phase in the life cycle of a plant having alternation of generations


an involuntary orienting response


anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies


a covered cistern


the transport of dissolved material within a plant


promote stem lengthening, helps buds and seeds break dormancy and influence flowering (active in spring)

abscisic acid

plant hormone that inhibits cell division in buds and vascular cambium


a plant hormone that promotes root formation and bud growth

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