Conditioned Media - Describing the growth media enriched with growth substances adding nurse tissue enclosed in a semipermeable membrane.

Conducting Tissue - (trans mitting tissue). (1) Used for specialised thin walled tissue which constitutes the central part of style in some angiosperms through which pollen tube grows down to the funiculus.
(2) (Vascular tissue). The tissue in plants conducting water and other materials from one part of plant body to other parts. It includes xylem and pholem tissues.

Conduplicate - Folded ascertain grass leaves. Term is also used for describing a form of vernation in which each leaf gets folded in U-shape around the next youngest leaf.
Cone - Any of various cone-shaped structures seen in angiosperms e.g., aggregate fruits of alders (Alnus) and hops Humulus).See strobilus.
Condium - (Conidiospore, Conidisposrangium). Used for an asexual spore which is produced by many fungi especially. Ascomycetes, on specialized erect hyphae (conidiophores conidiosporaniophores).

Conjugated Protein - A protein having other ccomponents besides polypeptide chains. Such proteins are classified according to the nature of non-peptide portion of molecule. Examples are glycoproteins, lipoproteins, etc.

Conjugate Nuclei - Two nuclei in one cell, which undergo division.

Conjugation Tube - A tubular outgrowth which is formed by the fusion of two lateral outgrowths, one from each of a pair of copulating cells: It is through this tube that the male and female (or+and-strains) gametes undergo fusion.

Conjugation - (1) The pairing of gametes (usually isogametes) or zygotes; or the fusion of pairs of nuclei.
(2) The lateral association of chromosomes in the early prois formed between
specialized tissue, e.g., between vascular strands.

Connate - Used for similar structures that are fused with each
other e.g., petals to form a tube.

Connective - Used for the parenchymatous tissue joining the pollen
sacs in an anther.

Consociation - An association in which one species becomes distnctly dominant, e.g., oakwood.

Consortism, Consortium - Used for the mutual relationship,
as taking place between the fungus and alga in a lichen thallus.

Constitutive Enzyme - An enzzyme always present in nearly constant amounts in a given cell forming part of the permanent basic cellular mechanism e.g., enzymes of glycolysis.

Consumer - An organism that cannot synthesize its own food by use of energy available in its environment but feed on some other organism(s).
Contact - Generally used as an insecticide or herbicide which can kill an insect or plant by contact only rather than relying on absorption or ingestion e.g., DDT and pyrithrin (insecticides).

Continental Drift Theory - According to this existing continents moved to their present positions after breakup of an ancient landmass pangaea during Mesozoic era.

Continuous Variation. Slight variation between a number of individuals of the same lineage, so that the differences grade into each other.

Contorted - Said of sepals and petals in the bud, twisted so that they overlap on one side only.

Contorted Aestivation - Used for the arrangement of the perianth in the bud, when all the perianth segments overlap by either their right-hand or left-hand edges.

Contractile Root - A rather fleshy root, which becomes transversely corrugated as it ages, thus shortening, and dragging the the plant deeper into the ground.

Contractile Vacuole - A cavity in cytoplasm which is surrounded by a membrane and filled with water. It is found in many freshwater unicellular organisms.

Convergent Evolution - convergencce). Used for the evolution of analogous structures in unrelated groups of organisms as a result of response to their similar environmental conditions e.g., insectivory in families Nepenthaceae, Sarraceniaceae and Droseraceae. See also parallel evolution.

Coppicing - Describing the woodland management in which trees are cut back to ground level regularly every 10-15 years for encouraging growth of numerous adventitious shoots from the base.

Coprophilous - Used for an organism living on or in dung e.g., fungi or Pilobolaceae.

Cordaitales - An order of the Coniferopsida. They were tall woody trees of the Carboniferous era. The leaves were slender and simple, and the inflorescence was a loose cone.

Cordate - Used for a structure that is heart-shaped e.g., leaf of Viola odorataor the lemmas of Briza grasses.

Coriaceous - Used for a structure having a leathery texture.

Cork - A layer of suberized, dead cells which are cut off by a phellogen on the outside of the stem or root of a woody plant. The layer is protective and impervious to gases and water vapour. It replaces the epidermis.

Cork Wood - A wood of low specific gravity, due to the presence of many large thein-walled parenchymatous cells.

Corm - (1) A bolbous swollen stem base which is bearing scale leaves and adventitious roots. It is a storage organ, and acts as a means of vegetative propagation.
(2) The bulbous stem of Isoetes.

Cormophyte - A plant having a stem, root and leaf.

Corolla - A collective term for the petals of a flower.

Corolla Tube - A tube like structure which is formed by petals i.e., by fusion of petals together by their margins as in Catharanthusroseus.

Corona - (1) A trumpet like outgrowth of the perianth, e.g., of a sp; Daffodil.
(2) A ring of leafy outgrowths from the petals