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Chapter 37 Possible Test Questions

Terms in this set (90)

● The insect body is divided into three tagmata. The head
has mandibles and one pair of unbranched antennae;
the thorax has three pairs of jointed legs and, in many
species, one or two pairs of wings; and the abdomen has
9 to 11 segments but neither wings nor legs in adults.
● Insects live in almost every terrestrial and freshwater
environment. Factors responsible for their success include
their ability to fly, exoskeleton, jointed appendages, small
size, and short life span.
● Insects negatively affect humans by competing for food,
transmitting diseases, and destroying buildings and other
manufactured products. However, insects are also
beneficial. They serve as food for other animals, pollinate
flowers, make valuable products such as honey, and
recycle nutrients.
● The mouthparts of insects are often specialized for
tearing and cutting solid food or for sucking or soaking
up liquid food.
● Insects have an open circulatory system that transports
nutrients through the body. Gas exchange occurs by
means of air-filled tracheae that reach deep into the
body. Malpighian tubules remove cellular wastes from
the hemolymph while conserving water
● Insect sensory structures include simple and compound
eyes, sound-sensing tympana in some species, and
sensory hairs on the antennae and other body parts.
● Most insects go through metamorphosis. In incomplete
metamorphosis, a nymph hatches from an egg and
resembles the adult but has undeveloped reproductive
organs and no wings. The nymph molts several times to
become an adult.
● In complete metamorphosis, a wormlike larva hatches
from an egg and molts several times before becoming
a pupa. The pupa molts to produce the adult, which
resembles neither the larva nor the pupa.
● Insects can defend themselves by stinging, using
camouflage, or releasing noxious chemicals. Insects that
are dangerous or taste bad often have warning
coloration that makes them recognizable to predators.
The warning coloration of a dangerous species may be
mimicked by harmless species.