Dictionary,Defintion,Meaning,What is Artificial Parthenogenesis, Asteroidea, Artificial Insemination, Artificial respiration

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Home >>Biology Dictionary >> Artificial Parthenogenesis - Asteroidea

	Artificial Insemination Artificial injection of semen into female. Much used in animal breeding, since sperm of animal with desirable hereditary qualities can be transported over long distances and used to inseminate numerous females, under conditions optimum for fertility. Artificial Parthenogenesis Artificial activation of development of an egg (that is not normally parthenogenetic) without contact with sperm. This can be done in many animals (including mammals) by treating eggs in various ways, e.g. cooling; pricking with a needle; treating with acid. In a small proportion of instances the activated egg can develop into an adult.
Ascaris A genus of parabitic round worm that occasionally inhabits of the loop of Henle in kidney tubules. Ascidian Sea-squirt; a member of the Urochordata. Ascorcarp General term for fruit body (cleistocarp, apothecium. or perithecium) of an ascomycetes fungus. Ascogonium It is the female gametangium of certain axomycete.
Ascomycetes a class of fungi. Ascorbic acid (Vitamin C) Vitamin known to be required from food by man, guinea pig and some other mammals, but to be synthesized by most other animals studied. Deficiency prevents collagen formation (e.g. in healing wounds), causing scurvy. Ascorpore A spore produced from an ascus produced as a result of sexual fusion. The ascus undergoes meiosis to produce usually 8 ascospores. Ascus A sac like cell produced (spherical, cylindrical or clubshaped) in which fusion of haploid nuclei occurs during sexual reproduction, followed by meiosis and formation of usually, eight haploid ascospores.
Assimilation The process of incorporation of simple foodstuffs, or products of digestion of food-stuffs, into complex constituents of the organism. Association Sub division of a plant dominated by particular species and named according to them, e.g. oak-beech association of deciduous forest. Sometimes applied to very small natural unit of vegetation. Association Centre An area of nervous coordination in invertebrates that distributes stimuli received from sensory receptors.
	Aster A starlike arrangement of small fibres radiating from a centriole. Asters become conspicuous in animal cells at the end of the spindle when cell division starts. Asteroidea Star fishes. Class of Echinodermata. Star – shaped; arms, containing projection of gut etc. not sharply marked off from central part of body; mouth downwards; suckered tube feet; spines and pedicillariae. Carnivorous (some notoriously on oysters). Atavism The recurrence of a characteristic possessed by an ancestor after an absence for several generations.

Artificial respiration
The maintenance of breathing by artificial means. Examples include mouth to mouth resuscitation, physical compression and distention of the thorax, the use of a respirator.

Artiodactyla
An order of hooved mammals comprising the even-toed ungulates, in which the third and fourth digits are equally developed and bear the weight of the body. The order includes cattle and other ruminants (see Ruminantia), camels hippopotamuses, and pigs. All except the latter are herbivorous, having an elongated gut and teeth with enamel ridges for grinding tough grasses.

Asexual reproduction
Reproduction without gametes (excludes parthenogenesis).

Ataxia
It refers to lack of muscle coordination.

Atlas
The first cervical vertebra, a ring like bone that joins the skull to the vertebral column in terrestrial vertebrates. In advanced vertebrates articulation between the skull and atlas permits nodding articulation between the skull and atlas permits nodding movements of the head.

Atmometer
An instrument for measuring the rate of evaporation of water into the air. This is simply carried out by measuring the level of water in a calibrated cylinder at frequent intervals.

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