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PPSE FINAL
Terms Part 2
50
Other
Undergraduate 1
03/13/2011

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Term
Cohesion
Definition
the attraction of like particles or molecules.
Term
Commensalism
Definition
a symbiotic relationship in which one species benefits and the impact on other is neutral.
Term
Community
Definition
an assemblage of species that share an ecosystem.
Term
Complete metamorphosis
Definition
holometabolism.
Term
Compound eye
Definition
refers to an insect’s eye that is comprised of several to many ommatidia.
Term
Continental drift
Definition
the movement of the Earth's continents on massive ocean floor rocks.
Term
Control
Definition
within an experiment, a standard to which treatments are compared.
Term
Convergent evolution
Definition
the morphological similarity of unrelated organisms that live in similar climatic environments.
Term
Cornea
Definition
in the human eye, the outermost protective layer, which begins to focus light; in insects, the outermost layer of an ommatidium, which functions to protect it.
Term
Cornicles
Definition
secretory appendages on the end of the abdomen in aphids.
Term
Crochets
Definition
hook-like structures on the end of the prolegs in immature Lepidoptera, which further help caterpillars cling to surfaces.
Term
Crop
Definition
part of the insect gut which functions to store food.
Term
Crypsis
Definition
secretive or hidden. Referring to the ability of some insects to blend into their envioronment because of camouflaged coloration or shape.
Term
Crystalline cone
Definition
lies just beneath the cornea and helps to focus light onto the retinula cells.
Term
Cuticle
Definition
the outer layer of the exoskeleton, comprised primarily of chitin and proteins, and topped with wax.
Term
Cytoplasm
Definition
fluid inside a cell.
Term
Data
Definition
information, often in the form of numbers recorded from an experiment.
Term
DDT
Definition
a chemical discovered to have insecticidal properties in 1939, and widely used during the next three decades around the world.
Term
Decomposer
Definition
an organism that feeds on dead plant or animal matter, or animal waste products.
Term
Degree day
Definition
the accumulation of one degree of heat above a certain threshold for a 24 hour period.
Term
Delusory parasitosis
Definition
a belief that very small organisms are living on or under the skin.
Term
Dendrite
Definition
the part of the neuron that receives nerve impulses from the terminal arborization of an adjacent neuron.
Term
Deoxyribonucleic acid (DNA)
Definition
a molecule consisting of many units of nucleotides, organized into structures called chromosomes.
Term
Diapause
Definition
a state of arrested development, which can take place in any insect stage.
Term
Digestive system (gut)
Definition
the metabolic system responsible for the breakdown and processing of food.
Term
Diploid
Definition
having two sets of chromosomes.
Term
Diptera, higher
Definition
the more advanced members of this order, characterized by bristle-like antennae and sponging mouthparts.
Term
Diptera, lower
Definition
the more primitive members of this order, characterized by multisegmented antennae and long legs.
Term
Direct flight
Definition
primitive method of flying in which muscles are attached to the bases of the wings.
Term
Dominant
Definition
referring to an allele, the expression of which masks a recessive allele.
Term
Drone
Definition
a male honeybee, whose sole purpose is to engage in a nuptial flight and mate with a virgin queen.
Term
Echolocation
Definition
high frequency sounds that organisms make in order to locate objects.
Term
Ecological niche
Definition
specifically defines what an organism needs to survive, that is, the sum of the conditions (temperature, pH, moisture, etc.) and resources (food, water, etc.) under which it can live.
Term
Ecology
Definition
the study of the interactions between an organism and its environment.
Term
Ecosystem
Definition
an assemblage of species plus its non living surroundings.
Term
Elytron (plural=elytra)
Definition
a sclerotized wing cover found in the Coleoptera.
Term
Embryo
Definition
the developmental stage between fertilization and the immature stage.
Term
Endocrine system
Definition
the metabolic system of hormones.
Term
Endoparasite
Definition
a parasite which lives within its host (see Parasite).
Term
Endoskeleton
Definition
the internal framework of vertebrates.
Term
Entomophobia
Definition
a persistent and irrational fear of insects or spiders.
Term
Ephemeral
Definition
short-lived.
Term
Epidermis
Definition
the layer of cells above the basement membrane; among its functions is to secrete the cuticle.
Term
Esophagus
Definition
the tube-like, non-musculated part of the insect gut.
Term
Exoskeleton
Definition
the protective outer covering of arthropods, consisting of basement membrane, epidermis and cuticle. Also known as the integument.
Term
Experiment
Definition
a method used to test a hypothesis, which includes treatments, replications and a control.
Term
Extant
Definition
still in existence
Term
Fang
Definition
the distal end of a chelicera in the Araneae, from where poison is injected into prey.
Term
Female choice
Definition
see sexual selection.
Term
Fetus
Definition
the embryo of mammals.
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