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PPSE FINAL
All Terms
273
Other
Undergraduate 1
03/13/2011

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Term
Abdomen
Definition
the posterior most body region of insects.
Term
Acarina
Definition
An order of the Arachnida, comprising the mites and ticks.
Term
Action potential
Definition
the nerve impulse that travels across the axon, in the form of electrical energy.
Term
Adaptation
Definition
the process that promotes individual survival and reproduction in an environment.
Term
Adaptive radiation
Definition
the speciation resulting from a founder population and a lack of competition for resources from other organisms.
Term
Adhesion
Definition
the force attracting unlike particles or molecules.
Term
Aedeagus
Definition
the insect male's reproductive organ, inserted into the female's bursa during copulation.
Term
Allele
Definition
a form of a gene.
Term
Amber
Definition
fossilized tree resin.
Term
Ametabolism (ametabolous development)
Definition
metamorphosis in which the change from immature to adult is size and sexual maturation.
Term
Anatomy (morphology)
Definition
the study of an insect’s body structure as well as the naming of body parts.
Term
Antennae
Definition
sensory structures found on the head of insects.
Term
Anus
Definition
opening at the end of the digestive system where the wasted is flushed out.
Term
Apical
Definition
towards the tip.
Term
Aposematic
Definition
Coloration that indicates danger or warning.
Term
Araneae
Definition
An order of the Class Arachnida, comprising the spiders.
Term
Asexual reproduction
Definition
see parthenogenesis.
Term
Autotroph
Definition
an organism that is able to produce its own food.
Term
Axon
Definition
the long, unbranched portion of a nerve cell, along which the action potential is generated.
Term
B.t.
Definition
abbreviation for Bacillus thurengiensis, a bacterium which produces a protein toxic to immature Lepidoptera, Coleoptera or Diptera when ingested.
Term
Ballooning
Definition
With spiders, the action of sending out a thread of silk and letting the wind carry it aloft.
Term
Basal
Definition
towards the base.
Term
Basement membrane
Definition
the innermost layer of the integument (exoskeleton).
Term
Biodiversity
Definition
the number of species of all living organisms on Earth.
Term
Biogeography
Definition
the study of the distribution of organisms around the world.
Term
Biological control
Definition
the action of natural enemies to lower a population of insects or mites.
Term
Biomass
Definition
the matter in living organisms, resulting from the conversion of solar energy.
Term
Biome
Definition
the dominant vegetation in a region.
Term
Biparental reproduction
Definition
reproduction which necessitates two parents, one producing sperm, one the egg
Term
Bivoltine
Definition
having two generations per year.
Term
Broad spectrum
Definition
referring to an insecticide which kills a wide range of insects.
Term
Brood
Definition
see generation.
Term
Bubo
Definition
a swelling of a lymph node.
Term
Bursa
Definition
the copulatory sack of female insects, into which the aedeagus is inserted during copulation.
Term
Butterfly
Definition
a member of the Lepidoptera which is diurnal, usually colorful, and whose antennal tips are swollen.
Term
Carbon
Definition
an element with six protons and six neutrons.
Term
Carnivore
Definition
an organism that eats other animals.
Term
Carrion
Definition
a dead animal.
Term
Caterpillar
Definition
an immature Lepidoptera.
Term
Central nervous system
Definition
in humans, the brain and spinal cord; in insects, the ganglia in the head, thorax and abdomen.
Term
Cephalothorax
Definition
the fused head and thorax in the spiders.
Term
Cerci
Definition
the appendages on the posterior of insects' abdomens, which function as sensory structures, similar to the antennae of the head.
Term
Chelicerae
Definition
the claw-like mouthparts of arachnids.
Term
Chemoreceptor
Definition
a receptor that is sensitive to chemical stimuli, used in detecting smell and taste.
Term
Chitin
Definition
a polysaccharide (complex sugar) that comprises about 50% of insect cuticle.
Term
Chlorotic
Definition
a yellowing of plant tissue.
Term
Chorion
Definition
the outer layer of the insect egg.
Term
Chromosome
Definition
a molecular unit comprised of DNA.
Term
Chrysalis
Definition
in some lepidopteran species, the pupa that lacks the silken cocoon.
Term
Cocoon
Definition
the silken covering over the pupa.
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.
Term
Fitness
Definition
an organism’s ability to reproduce and pass on characteristics to future generations relative to the rest of the population.
Term
Food web
Definition
the complex of food interactions among members of a community.
Term
Forensic entomology
Definition
the use of entomology to settle legal issues, particularly murders.
Term
Fossil
Definition
a record of a dead organism.
Term
Founder effect
Definition
occurs when a small colonizing population, carrying a small percentage of potential species genetic diversity, expands to a very large population.
Term
Fully social
Definition
In some Hymenoptera and all Isoptera, a life cycle in which the queen (and hence the colony) live for many years.
Term
Gamete
Definition
a haploid reproductive cells, either egg or sperm.
Term
Gastric caecae
Definition
an organ which is part of the insect digestive system, which secretes digestive enzymes. Analogous to the pancreas of humans.
Term
Gene
Definition
a sequence of nucleotides that codes for a protein.
Term
Gene flow
Definition
the movement of genes from one population to another
Term
Generation
Definition
a life cycle; in insects, from egg to immature to adult and back to the egg.
Term
Genetic drift
Definition
random changes in allele frequencies; occurs usually with there are small populations.
Term
Genotype
Definition
the combination of alleles present in an organism's chromosomes.
Term
Germ cells
Definition
cells which give rise to gametes.
Term
Glyerol
Definition
an alcohol with three hydroxyl groups that is used as antifreeze by many insects to survive cold winter temperatures. Glycerol has a minimum freezing temperature of about -35 degrees (C or F).
Term
Gravity
Definition
the attractive force between two objects, proportionate to mass and distance.
Term
Habitat
Definition
A location where an species or assemblage of species lives.
Term
Haiku
Definition
a Japanese poetic style, consisting of three lines and 17 syllables, in a pattern of 5-7-5.
Term
Halteres
Definition
the vestigial hindwings of the Diptera, which now resemble small knobs and are used for balance, not flying.
Term
Haplo-diploidy
Definition
a genetic condition in some insect species in which females are diploid and males are haploid.
Term
Haploid
Definition
having just one set of chromosomes
Term
Hardy-Weinberg principle
Definition
provides a base line to explain how changes in allele frequencies lead to evolutionary change.
Term
Hemelytron (-hemelytra plural)
Definition
means half-hardened wing. The forewing of the true bugs (Hemiptera).
Term
Hemimetabolism
Definition
the type of insect metamorphosis in which immatures resemble the adults with the exception of wings and sexual organs. See incomplete metamorphosis.
Term
Hemocytes
Definition
insect blood cells.
Term
Hemolymph
Definition
insect blood.
Term
Herbivore
Definition
an organism that solely eats plant material.
Term
Heritable
Definition
a characteristic that can be passed from parent to offspring through genes.
Term
Heterotroph
Definition
an organism that cannot produce its own food and depends on must consume other organisms to obtain energy.
Term
Heterozygous
Definition
the genetic condition in which different alleles are present.
Term
Holometabolism
Definition
the type of insect metamorphosis in which a pupal stage is present, and the immature stage does not resemble the adult. See complete metamorphosis.
Term
Homozygous
Definition
the genetic condition in which both alleles are the same.
Term
Honeydew
Definition
a sugary waste product, commonly released by Hemiptera such as aphids, whiteflies, scales, psyllids and mealybugs.
Term
Hormones
Definition
chemicals produced by endocrine cells or glands, used for internal communication.
Term
Host
Definition
an organism which is fed upon by a parasite or parasitoid.
Term
Hydrophobic
Definition
not water soluble, literally, "water hating."
Term
Hypostome
Definition
a structure found in the Acarina; on ticks it has backward facing barbs.
Term
Hypothesis
Definition
a testable question.
Term
In copula
Definition
referring to the mating process, by which a male and a female are locked during sperm transfer.
Term
Incomplete metamorphosis
Definition
Ametabolism or hemimetabolism.
Term
Indirect flight
Definition
the more advanced way of insect flight, in which the flight muscles are attached to the thoracic body wall.
Term
Industrial melanism
Definition
a phenomenon which occurred in 19th century England, when dark peppered moths were selected for over light moths.
Term
Insectary
Definition
an insect rearing facility.
Term
Integrated pest management
Definition
a pest management strategy which combines elements of biological, cultural and chemical controls.
Term
Integument
Definition
synonym for exoskeleton.
Term
Iris
Definition
in humans, the colored, musculated part of the eye that flanks the pupil.
Term
Isotope
Definition
an elemental variation which contains the same number of protons but a different number of neutrons.
Term
Jaundice
Definition
a condition in which the body cannot break down bilirubin (which is formed by the break down of red blood cells), and turns the skin and whites of eyes yellow.
Term
Kinetic energy
Definition
the energy of motion.
Term
Labium
Definition
in chewing insects, the lower "lip."
Term
Labrum
Definition
in chewing insects, the upper "lip."
Term
Larva
Definition
an immature from the orders which exhibit complete metamorphosis (Neuroptera, Coleoptera, Diptera, Lepidoptera and Hymenoptera), or a first instar mite.
Term
Lens
Definition
the biconvex structure in the human eye that focuses light onto the retina.
Term
Light receptor
Definition
a type of sensory structure that captures light.
Term
Linnaeus, Carolus
Definition
18th century Swedish naturalist, considered to be the father of organismal classification.
Term
Macroevolution
Definition
genetic changes occurring on a grand scale and over a long period of time, leading to new species.
Term
Maggot
Definition
the larva of the Diptera.
Term
Malaria
Definition
a disease caused by protozoa in the genus Plasmodium, and vectored by mosquitoes in the genus Anopheles.
Term
Malpighian Tubules
Definition
part of the insect excretory system, they function to filter nitrogenous wastes from the insect's body, analogous to human kidneys.
Term
Mammal
Definition
an animal characterized by feeding the young through mammary glands.
Term
Mandible
Definition
the stout tooth-like mouthpart of chewing or mandibulate insects.
Term
Marsupials
Definition
a mammal that raises its young primarily outside of the body, in a pouch.
Term
Maxilla
Definition
the slender tooth-like mouthpart of chewing or mandibulate insects.
Term
Measure of success
Definition
a phenomenon that is an indicator of how well a group of organisms is performing on Earth.
Term
Mechanoreceptor
Definition
a sensory structure comprised of cuticle, attached to a single neuron, that responds to touch, vibration or sound.
Term
Meiosis
Definition
the division of germ cells, which results in four haploid gametes.
Term
Metamorphosis
Definition
the arthropod transformation from egg to immature to adult.
Term
Microevolution
Definition
the change in allele frequency within a population.A109
Term
Midgut
Definition
located in the middle of the stomach, it contains the gastric caecae and further breaks down the food.
Term
Mimicry
Definition
having the colors or patterns of dangerous or poisonous animals, while not being dangerous or poisonous.
Term
Molt
Definition
the outer layer of the integument, which is shed during the molting process.
Term
Molting
Definition
the shedding of the cuticle, which takes place between stages of immature insects.
Term
Moth
Definition
A member of the Lepidoptera which is nocturnal, usually drab in coloration and whose antennae are feathery or multisegmented.
Term
Multivoltine
Definition
having more than two generations per year.
Term
Mutation
Definition
a change in an organism’s DNA, which may have negative, neutral or positive consequences.
Term
Mutualism
Definition
a symbiotic relationship in which both species benefit.
Term
Natural enemy
Definition
the collective term for predators, parasitoids and pathogens, which kill insects and mites and lower their population density.
Term
Natural selection
Definition
a principle proposed by Darwin which states that an organism less adapted to its environment will have lower fitness (produce fewer offspring).
Term
Nerve cell (neuron)
Definition
the cell of the nervous system, responsible for receiving and transmitting nerve impulses from one area of the body to another.
Term
Newton’s Law of Universal Gravitation
Definition
the principle that every object in the universe has a gravitational pull on every other object.
Term
Nit
Definition
an immature louse (Phthiraptera).
Term
Nucleotide (nucleic acid)
Definition
a molecule consisting of a sugar (deoxyribose), a nitrogenous base (A,T,C or G) and a phosphate.
Term
Nucleus
Definition
the part of the cell which contains the genetic material (DNA).
Term
Nymph
Definition
an immature from the orders which exhibit incomplete metamorphosis.
Term
Ocellus (plural=ocelli)
Definition
the simple eye of many insects; located on the vertex and next to the compound eyes; sensitive to light which helps the insect keep track of day and night.
Term
Ommatidium (-a)
Definition
a subunit that makes up the compound eye; the more subunits, the higher visual acuity.
Term
Ootheca
Definition
a case in which eggs are deposited, characteristic of Blattodea and Mantodea.
Term
Optic nerve
Definition
in the human eye, an aggregation of nerve cells which carry information from the eye to the brain.
Term
Organophosphate
Definition
a class of insecticides which interferes with the transmission of information across the synapse between nerve cells.
Term
Oviparity
Definition
the birthing strategy in which eggs are laid into the environment.
Term
Ovoviviparity
Definition
a birthing strategy in which eggs are retained in the female until they hatch, whereby a nymph or larva is deposited into the environment.
Term
Parallel adaptation
Definition
a variation on convergent evolution, in which organisms adapt to similar conditions in disparate part of the world, resulting in organismal counterparts.
Term
Parasite
Definition
an organism which lives on or in a host organism, and feeds on that host, typically without killing it.
Term
Parasitism
Definition
a relationship in which one organism benefits and the other is harmed.
Term
Parthenogenesis
Definition
reproduction without males; also known as asexual reproduction.
Term
Pedipalp
Definition
a sensory appendage on the head region of the Arachnida.
Term
Pesticide
Definition
an element or chemical used to kill, harm or reduce damage from a pest.
Term
Phenotype
Definition
the biological and physical characteristics of an organism, based on its genotype.
Term
Pheromone
Definition
a biochemical produced by an individual and which elicits a reaction from a member of the same species.
Term
Phloem
Definition
one of the vascular tissues of a plant, which primarily carries sugars and amino acids.
Term
Phytophagous
Definition
feeding on plants.
Term
Pigment cell
Definition
in the insect eye, the cells which surround each ommatidium and protect it from scattered light.
Term
Placenta
Definition
an organ which attaches to the uterus, and in which the embryo develops
Term
Pneumonic
Definition
having to do with the lungs.
Term
Predator
Definition
an organism which attacks, kills and devours its prey.
Term
Prey
Definition
an organism which is fed upon by a predator.
Term
Primary producer
Definition
see autotroph
Term
Proboscis
Definition
see rostrum.
Term
Prolegs
Definition
in Lepidoptera, outcroppings of the exoskeleton along the abdomen that help the caterpillar grasp onto plant surfaces. Not true legs.
Term
Pronation
Definition
movement toward the midline of the body.
Term
Proteolytic
Definition
the process of breaking down proteins into amino acids.
Term
Proventriculus
Definition
a musculated part of the digestive system which is responsible for chewing and grinding food.
Term
Psyche
Definition
in Greek mythology, a beautiful mortal woman who attained the state of a goddess and whose symbol is the butterfly.
Term
Punctuated equilibria
Definition
referring to the irregular rate of evolutionary change, with long periods of slow change, interrupted by bursts of rapid speciation.
Term
Pupa
Definition
the transformation stage of the holometabolous orders, in between larva and adult.
Term
Pupil
Definition
in the human eye, the aperture that regulates the amount of light by opening and closing.
Term
Pyrethroid
Definition
a class of insecticides which interfere with the nerve impulse across the axon.
Term
Reason for success
Definition
the basis for how well an organismal group is performing on Earth.
Term
Recessive
Definition
referring to an allele which cannot be expressed in the presence of a dominant allele.
Term
Rectum
Definition
posterior part of the excretory system, which eliminates waste from the insect's body.
Term
Resistance
Definition
In an insect or mite population, the increase in frequency of alleles which can detoxify an insecticide or miticide.
Term
Retina
Definition
in the human eye, the membrane at the back of the eye imbedded with light sensitive cells.
Term
Retinula cell
Definition
in the insect, the light receptive cell within an ommatidium.
Term
Rostrum
Definition
the snout-like arrangement of the mouthparts in some insects such as the Hemiptera or mosquitoes. See proboscis.
Term
Salivary channel
Definition
a groove formed by the mandibles and maxillae through which saliva is injected into the host.
Term
Salivary glands
Definition
in insects or humans, organs that secret initial digestive enzymes.
Term
Scientific binomen
Definition
the two part Latin name of a species.
Term
Scientific method
Definition
a process to answer a question, involving an experiment.
Term
Sclerotized
Definition
hardened.
Term
Semi-social
Definition
In some Hymenoptera, a life cycle in which the mated queen is the only member of the colony which overwinters.
Term
Sensilla (sensory appendage)
Definition
a sense organ which consists of cuticle.
Term
Septicemia
Definition
the presence of bacteria in the blood.
Term
Sexual selection
Definition
female selection of a mate based on physical characteristics or ability. This leads to differences in characteristics between males and females. Also known as female choice.
Term
Siphoning
Definition
referring to the lepidopteran mouthparts, consisting of paired coiled tubes which are inserted into flowers to feed on nectar.
Term
Solitary
Definition
living alone. Solitary organisms meet with members of their own species solely for purposes of mating.
Term
Somatic cells
Definition
cells of a body which are not involved in reproduction.
Term
Species
Definition
groups of organisms that are reproductively isolated from other such groups. Species is singular and plural, and "spp." is the abbreviation for species plural.
Term
Spermatheca
Definition
part of the insect female reproductive system, an organ which stores sperm.
Term
Spermatophore
Definition
a gelatinous substance produced by the male accessory gland in insects, which protects the sperm during copulation.
Term
Spinneret
Definition
an appendage on the posterior end of spiders, from which silk is spun. Spiders have from four to eight.
Term
Spinosad
Definition
a chemical derived from the bacterium Saccharopolyspora spinosa, and used as an insecticide.
Term
Spiracle
Definition
an opening in the insect's integument that allows for gas exchange between the insect’s body and its surrounding environment.
Term
Spirochete
Definition
a single celled microorganism which has properties of both bacteria and viruses.
Term
Spontaneous generation
Definition
the belief that organisms arise from dead, decaying or waste matter.
Term
Stridulate
Definition
the process of making a noise by rubbing two rough surfaces together. Many Orthoptera stridulate by rubbing two legs or a leg and a wing together.
Term
Stylet
Definition
the needle-like modification of the mandibles and maxillae, used for piercing and sucking in insects such as the Hemiptera and mosquitoes.
Term
Supination
Definition
Movement toward the outside of the body.
Term
Surface area to volume ratio
Definition
the two dimensional measure on an insect relative to the three dimensional measure within.
Term
Surface tension
Definition
the cohesive forces between molecules that allow a liquid to resist an external force.
Term
Symbiotic
Definition
"living together." A symbiotic relationship involves two species, which may be mutually beneficial, positive to one and negative to the other, or positive to one and neutral to the other.
Term
Synapse
Definition
the gap between two nerve cells where there is an exchange of neurotransmitters.
Term
Systematics
Definition
the study of the classification of organisms and also their historical relationships.
Term
Tachinid
Definition
a member of a parasitoid family of Diptera.
Term
Tarsus
Definition
the last segment of an insect's leg (analogous to the foot).
Term
Taxon (plural=taxa)
Definition
a category of classification (kingdom, phylum, class, order, family, genus, species).
Term
Taxonomy
Definition
the science of naming organisms.
Term
Terminal velocity
Definition
in free fall, the point at which a falling body experiences no acceleration.
Term
Trachea (plural=tracheae)
Definition
a tube lined with integument that carries air within the insects' body.
Term
Tracheole
Definition
a very small trachea
Term
Treatment
Definition
within an experiment, conditions which are applied to a test subject.
Term
Tympanum (plural =tympana)
Definition
a type of mechanoreceptor that responds to sound waves, in the form of a membrane that is stretched like the top of a drum.
Term
Typhus
Definition
a disease caused by the spirochete Rickettsia prowazeckii and vectored by the human body louse.
Term
Univoltine
Definition
having one generation per year.
Term
Vector
Definition
an organism which has the potential to transfer an infectious agent into another organism.
Term
Vestigial
Definition
the remnant of what once was; the vestige of an appendage.
Term
Vitelline membrane
Definition
the inner membrane of an egg, which underlies the chorion.
Term
Voltinism
Definition
referring to the number of generations per year.
Term
Wadi
Definition
Arabic word for a swale that collects water after a rain.
Term
Wing pads
Definition
the developing wings of insect nymphs.PPSC 110-People, Pests and Plagues
Term
Worker
Definition
a female honeybee whose reproductive organs are undeveloped.
Term
Yellow fever
Definition
a viral disease vectored by mosquitoes in the genus Aedes.
Term
Yolk
Definition
the part of the egg which nourished the developing embryo, consisting primarily of lipids.
Term
Zygote
Definition
a cell resulting from the union of sperm and egg.
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