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Gonochorism. In biology, gonochorism is a sexual system where there are two sexes and each individual organism is either male or female. [1] The term gonochorism is usually applied in animal species, the vast majority of which are gonochoric. [2] : 212–222.
Convergence insufficiency. Convergence Insufficiency. Other names. Convergence disorder. Specialty. Ophthalmology, optometry. Convergence insufficiency is a sensory and neuromuscular anomaly of the binocular vision system, characterized by a reduced ability of the eyes to turn towards each other, or sustain convergence .
Aquatic respiration. Sea slugs respire through a gill (or ctenidium) Aquatic respiration is the process whereby an aquatic organism exchanges respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excreting carbon dioxide and some other metabolic waste products into the water.
Esotropia is a form of strabismus in which one or both eyes turn inward. The condition can be constantly present, or occur intermittently, and can give the affected individual a "cross-eyed" appearance. [1] It is the opposite of exotropia and usually involves more severe axis deviation than esophoria. Esotropia is sometimes erroneously called ...
Arisaema is a plant genus which is commonly cited as exercising sequential hermaphroditism. The most commonly known Arisaema plant is Arisaema triphyllum (Jack in the pulpit) plant. As the A. triphyllum grows and changes, it develops from a nonsexual juvenile plant, to a young all-male plant, to a male-and-female plant, to an all-female plant.
An electric fish generates an electric field using an electric organ, modified from muscles in its tail. The field is called weak if it is only enough to detect prey, and strong if it is powerful enough to stun or kill. The field may be in brief pulses, as in the elephantfishes, or a continuous wave, as in the knifefishes.
Hypostomus plecostomus. Hypostomus plecostomus, also known as the suckermouth catfish or common pleco, is a tropical freshwater fish belonging to the armored catfish family ( Loricariidae ), named for the longitudinal rows of armor -like scutes that cover the upper parts of the head and body (the lower surface of head and abdomen is naked soft ...
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]