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The insect body is divided into three parts: the head, thorax, and abdomen. [2] The head is specialized for sensory input and food intake; the thorax, which is the anchor point for the legs and wings (if present), is specialized for locomotion; and the abdomen is for digestion , respiration , excretion , and reproduction.
A few taxa of the Trichoptera (caddisflies), which are the sister group to the Lepidoptera, have hair-like scales, but always on the wings and never on the body or other parts of the insect. [13] Caddisflies also possess caudal cerci on the abdomen, a feature absent in the Lepidoptera. [7]
An insect uses its digestive system to extract nutrients and other substances from the food it consumes. [3]Most of this food is ingested in the form of macromolecules and other complex substances (such as proteins, polysaccharides, fats, and nucleic acids) which must be broken down by catabolic reactions into smaller molecules (i.e. amino acids, simple sugars, etc.) before being used by cells ...
Many insects can hear, using tympanal organs, which may be on the legs or other parts of the body. Their sense of smell is via receptors, usually on the antennae and the mouthparts. Nearly all insects hatch from eggs. Insect growth is constrained by the inelastic exoskeleton, so development involves a series of molts. The immature stages often ...
Like many insect body parts, including mandibles, antennae and stylets, cerci are thought to have evolved from what were legs on the primal insect form, [3] a creature that may have resembled a velvet worm, Symphylan or a centipede, worm-like with one pair of limbs for each segment behind the head or anterior tagma.
The absence of taenidia in certain parts of the tracheal system allows the formation of collapsible air sacs, balloon-like structures that may store a reserve of air. In dry terrestrial environments, this temporary air supply allows an insect to conserve water by closing its spiracles during periods of high evaporative stress.
Prothorax of a beetle. The prothorax is the foremost of the three segments in the thorax of an insect, and bears the first pair of legs.Its principal sclerites (exoskeletal plates) are the pronotum (), the prosternum (), and the propleuron on each side.
The number of hairs across and within hair plates can vary [6] [7] and hair plates are found on different body parts, including the legs, [8] [9] [10] [6] [11] neck, [12] [13] and antennae. [ 14 ] [ 15 ] On the legs of insects, hair plates are found at the proximal joints (i.e. thorax-coxa, coxa-trochanter, and trochanter-femur joints) across ...
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