Dictionary,Defintion,Meaning,What is Aphid, Apospory, Aorta, Dorsal, Aorta, Ventral, Apetalous, Aphaniptera

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Home >>Biology Dictionary >> Aphid - Apospory

	Aorta, Dorsal Artery of vertebrates through which passes arterial blood to all the body, except the head and in some species the front limbs. Aorta, Ventral Large artery of fish and embryonic amniotes, which leads from ventricle of heart and gives off branches to gills or aortic arches. Apetalous Lanking petals, e.g. wood anemone. Aphaniptera The insect order containing the fleas, whose members are laterally compressed blood sucking forms which lack wings but have well developed hind legs modified for jumping.
Aphis Green flies, etc.; genus of hemipteran insects which such plant juices. Some carry virus diseases and as such are of great economic importance. Apical meristem A region at the tip of each shoot and root of a plant in which cell divisions are continually occurring to produce new stem and root tissues, respectively. The new tissues produced are known collectively as the primary tissues of the plant. See also meristem. Apocarpous Gynoecium having free carpels, e.g. buttercup.
Aposematic Coloration Warning Coloration. Apospory (1) The formation of embryo and seed directly from a diploid egg of an embryo-sac developed from a cell of nucellus i.e. without the formation of megaspore. Since there is no meiosis there is no fusion with a male gamete. (2) The formation of a diploid Gametophyte from any vegetative part of a sporophyte i.e. without spore formation. Since such a gametophyte is diploid it undergoes meiosis at the time of gamete formation. Apothecium Cup or saucer-shaped fruit body of certain ascomycetes fungi (Discomycetes or cup-fungi), and lichens, lined with a hymenium of asci and paraphyses. Sessile or stalked, often brightly coloured; varying from a few millimeters to more than forty coloured across.
Appendage Any considerable projection from the body of an animal. Paired a. One of a bilaterally symmetrical pair of appendages. Two such pairs (limbs or fins) occur in all gnathostome vertebrates. There is frequently one pair per segment in arthropods (e.g. walking-legs, mouth-parts, antennae) and polychaetes. Appendix, Vermiform An outgrowth of caecum (at junction of large and small intestines) of man, apse, and some other mammals, containing much lymphoid tissue.
	Apposition Growth in cell wall thickness brought about by the successive deposition of layers of material. Aptosochromatosis The process of colour change without moult in birds in which fully formed feathers change colour without abrasion. Aquaculture The manipulation of the reproduction, growth rates and mortality of acquatic organisms useful to man to enhance their yield; the aquatic equivalent of agriculture. Aquatic Refers to organisms that live in water.

Aphetohyoidea
A group of fossil fish possessing a primitive jaw suspension and a functional pair of first gill slits.

Aphid
Any member of the family Aphididae, order Hemiptera. Commonly called green fly. Aphids feed on plant juices by using piercing and sucking mouthparts and are of considerable economic importance because they can act as vectors of plant viruses.

Apomixis (Agamospermy)
A reproductive process in plants that superficially resembles normal sexual reproduction but in which there is no fusion of gametes. In apomictic flowering plants there is no fusion of gametes. In apomictic flowering plants there is no fertilization by pollen, and the embryos develop simply by division of a diploid cell of the ovule. See also parthenocarpy; parthenogenesis.

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