(2) (in animal anatomy) A type of light-sensitive receptor cell, fond in the retins of all diurnal vertebrates. Cones are specialized to transmit information about colour and they function best in bright light. They are not evenly distributed on the retina, being concentrated in the fovea and absent on the margin of the retina.

Conidum. Asexual spore of certain fungi cur off externally at apex of specialized hypha (conidiophore).

Cone.
1) (in botany) a reproductive structure occurring in gymnosperm and some pteridophytes, known technically as a strobilus. It consists sporophylls bearing the spore producing sporangia. Gymnosperm produce different male and female cones. The large woody female cones of pines, firs, and other conifers are made up of structures called ovuliferous scales, which bear the ovules.

Conjunctiva. The delicate membrance that covers the cornea and lines the inside of the eyelid of a vertebrate eye. It is kept clean by secretions of the lachrymal (tear) gland and the reflex blink mechanism.

Connective Tissue.
Vertebrate tissue consisting of connective tissue fibres usually mainly of collagen but with carrying amounts of elastin and reticulin; scattered cells (fibroblasts and macrophages); blood and lymph vessels; tissue fluid in space; and an amorphous polysaccharide – containing (proteoglycan (q.v) matrix. Supporting for packing in function. Many modifications occur.

Conjugation.
(1) The fusion of two reproductive cells, particularly when these are both the same (see isogamy). (2) A form of sexual reproduction seen in some algae (e.g. spirogyra), some bacteria (e.g. Escherichia coli), and ciliate protozoans. Two individuals are united by a tube formed by outgrowths from one or both of the cells. Genetic material from one cell (designed the male) then passes through the tube to unite with that in the other (female) cell.