Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how


KD-Science (from reviewers)

type of soil that contains a mixture of sand, silt, clay and humus loam
Englishman who introduced the scientific method Bacon
a muscle that forces air into and out of the lungs diaphragm
a structure that has infinite form and performs a certain function for a body is a _______ tissue
the part of a flower from which fruits are formed ovary
the layer of the atmosphere closest to the earth's surface troposphere
evaporation of water from plant leaves is called _______. transpiration
the tiny vessels that supply cells with oxygen and nutrients capillaries
all of the water found in the ocean, land, and atmosphere is known as ______. hydrosphere
organisms that provide the initial source of food in a food chain producers
one thing that makes it almost impossible for men to live in Arctic regions is the____ coldness
___ rocks form when molten materials inside the earth hardens igneous
large pits from which blocks of rock are mined are called ____ quarries
this part of the body helps keep our balance semicircular canals
it is a piece of land that is level and usually higher than the surrounding land plateau
bean-shaped organ that remove liquid wastes from the blood kidneys
the process by which rocks are broken down into soil weathering
the most common mineral in the earth's crust quartz
___ occurs when a sperm joins an egg cell fertilization
a seedling is a plant that is able to survive without its ____ cotyledons
these are tubes that carry urine from the kidneys to the bladder spleens
the best type of soil for growing plants is ___ loam
a group of organs that function together to do a specific job for the body organ system
it is the largest internal organ of the body liver
the products of photosynthesis are water, oxygen, and _____ glucose
animals that eat meat are called ______ carnivores
a ___ is a safety device to prevent fires when an electrical circuit becomes overheated fuse
a relationship in which two organisms benefit from each other symbiosis
___ and sulfur dioxide are the two compounds responsible for the formation of acid rain nitrogen oxide
wind, water and temperature changes cause rocks to break apart in a process called physical weathering
the blending of an animal's color into its surrounding is called _____ protective coloration
the color of visible light with the shortest wavelength is ___ violet
the color of visible light with the longest wavelength is ___ red
the electromagnetic waves that may produce skin cancer are___ ultraviolet rays
the tendency of a motionless object to remain at rest and the tendency of a moving object to continue moving inertia
many animals of the seashore do not move around but they have plenty to eat because the ____ bring their food to them tides
when electrons pass from one wire to another at the bare spots, by-passing a planned path and heating the wires, we say there is a _____ short circuit
light enters the eye through a hole called the _____ pupil
the pupil is surrounded by a colored substance called the ____ iris
this is a device for measuring wind speed anemometer
the imaginary line running through the center of the earth from pole to pole is called ____ axis
the area that has the widest yearly temperature variations is the ____ taiga
the sweat glands are found in the ____ skin
the _____ carry blood away from the heart arteries
the ___ stores bile produced by the liver gallbladder
if air is _______, it is holding 100% of the moisture it can hold saturated
an organized way of soling a problem scientific method
the longest day of the year is known as ___ summer solstice
rapidly rotating winds that blow around a small area of intense low pressure are called ____ tornadoes
the scientist who discovered that heavy and light bodies of the same substance fall at the same speed Newton
animals which are active by night are said to be ___ nocturnal
____ have flattened bodies with 2 pairs of legs per segment millipedes
these are marine animals covered with spines echinoderms
perpetually frozen ground below the surface is called ___ permafrost
a large quantity of air sharing the same characteristics is an ____ air mass
the type of front that moves the fastest is the ____ cold front
the part of the eye which prevents light from entering the eye is the ___ eyelid
the basic cause of all weather is the ___ sun
___ is really the weight of all the air about us air pressure
differences in air pressure cause the air to ____ move
air pressure, wind, heat and precipitation are things that make up the ___ atmosphere
clouds formed from the vertical lifting of warm air are ____ cumulus
the changing of liquid molecules to vapor is known as ___ evaporation
What is the law which states that volume and temperature are directly related? Charles Law
the largest family of flowering plants in the ____ family composite
the pH number for a neutral substance is ____ seven
a person who studies soil pedologist
Boyle's law and Charles's law explain the behavior of ____ gases
insects that feed on decaying matter are called ____ scavengers
since electricity is able to do work, scientists classify it as one form of ____ energy
the earth rotates from ____ to ____ west east
_____ is water vapor frozen at ground level frost
the layer of solid unbroken rock in the earth's crust is ____ bedrock
the leaves of the cactus plants are called ___ spine
lenses which make objects look larger are ___ in the middle thicker
a device for stopping and starting the flow of electricity is a ____ switch
____ is the inflammation of the mucous membrane of the trachea and the bronchial tubes bronchitis
the sweet liquid that attracts insects to flowers is ___ nectar
these are structures which give form to the body and protect vital organs bones
the _____ is used to indicate acidity and alkalinity pH scale
the number of complete waves that pass a given point in a unit of time is referred to as frequency
_____ is the measure of the gravitational force on an object weight
the atmospheric conditions at a certain time and place are called weather
the energy of position is called ____ energy potential
the leaflike structures that surround the petals of a flower are called sepals
the _____ connect bones to bones ligaments
what name is given to one-celled organisms lacking an organized nucleus? prokaryotes
at high temperatures the wire in a fuse will melt
Who discovered that planets travel in elliptical paths? Kepler
these are invertibrates which have tentacles, stinging cells and bodies like hollow cylinder with a single opening coelenterates
it is a kind of relationship wherein one species is benefited while the other is neither benefited nor harmed commensalism
a tubular sucking organ of the lepidopteran is called ____ proboscis
the region near the equator that has practically no wind is the ___ doldrums
the purpose of the eyespots on a luna moth's wings is to ____ protect
organisms that obtain nourishment from dead organisms are _____ saprophytes
organelles in plant cells that enables them to carry on photosynthesis chloroplasts
the principle which explains why airplanes can fly was discovered by Bernoulli
an infection may spread from the throat to the middle ear through the ____ Eustachian tube
scientists divide the distance between the boiling and freezing points into equal divisions. these divisions are called degrees
the number of protons an atom contains is indicated by its ___ atomic number
the largest order of insects is the order coleoptera
a sachet of coffee granules and a tablespoon of sugar were mixed with a cup of hot water, then stirred. the resulting mixture can be classified as ____ solution
a sachet of coffee granules and a tablespoon of sugar were mixed with a cup of hot water, then stirred. the solvent used is ______ hot water
a ____ can occur when the moon is between the earth and the sun solar eclipse
in which organ system are eyes and ears most closely associated? nervous system
the ___ tissue is the animal tissue that has a function of protection and support epithelial
the ___ tissue is the animal tissue that has a function of binding and support connective
the ___ tissue is the animal tissue that has a function of conduction and message sending nervous
_____ is the study of fishes ichthyology
_____ is the study of birds ornithology
one way ofeffectively killing a tree is to cut a ring of bark around the trunk of the tree. this method essentially affects the function of what tissue? phloem
____ is the amount of matter in a given space density
_____ is the change of velocity over a given time acceleration
_____ discovered the radioactivity of Uranium Madame Marie Curie
a weather instrument used to measure the relative humidity, using the cooling effect of evaporation psychrometer
____ is a symbiotic association of fungi and roots of plants mycorrhiza
how many significant figures are there in 1.00100? 6
_____ is the study of animals zoology
___ is the specific study of insects entomology
the Greek mathematician and astronomer who is known as the first person to accurately measure the size and circumference of the earth Erastosthenes
the formation of a new crust on the ocean is called sea-floor spreading
the ozone layer is known to filter harmful radiations such as UV and gamma rays from entering the earth and causing damage to life forms. In what region of the atmosphere is it mostly located? stratosphere
the largest organ in the human body is the ___ skin
the skin belongs to the ____ system integumentary
the hammer, anvil and stirrup are the three smallest bones in the human body and they are found in the _____ ear
if the chromosome number of your skin is 46, the number of chromosome in your gametes is ___ 23
it is during this period of the Mesozoic era when dinosaurs first evolved Triassic
a certain vine plant is symbiotically associated with a certain tree. the vine gets nutrients by piercing through the vascular tissues of the tree. this is a clear example of_______ parasitism
plants and animals must take in nitrogen to make proteins, animals get it from the food they eat, while plants get nitrogen from the ____ soil
which type of blood vessel generally carry oxygenated blood away from the heart to the different parts of the body? artery
what is the amount of work needed to push a 50 Newton box to a distance of 300 cm? 150Joules
the most abundant gas in the earth's atmosphere is _____ nitrogen
the most abundant element in the earth's crust is ____ silicon
dry ice is solid carbon dioxide and is very cold. when removed from a storage container, the dry ice transforms directly into a gas without melting. this is an example of ____ sublimation
if an atom has 4 protons, 5 neutrons and 3 electrons, what is the charge of the atom? positive 1
the process which changes food to a simple, soluble form is called _____ digestion
substances which cause chemical changes in foods are called _____ enzymes
an important substance which carries on digestion in the small intestine is ___ pancreatic juice
the secretion given off by the liver which helps in the digestion of fats is ____ bile
the liquid portion of the blood is the ___ plasma
all body functions of an individual are coordinated by the ____ nervous system
what is the smallest living thing which can cause disease in humans? bacterium
the food-making process in green plants is called ____ photosynthesis
a metallic substance capable of attracting iron and certain other materials magnet
metal cans, such as those used to pack foods can be attracted by magnet because the can is made chiefly of ___ tin
magnetic lines of force can be demonstrated with a magnet and ____ iron filings
a dry cell is safe to use in an experiment because it has a low voltage. the metallic case of a dry cell is made of ____ zinc
if the removal of one lamp from a string of christmas tree lights will cause the rest of the lamps to go out, the lamps are connected in ____ circuits series
all of the planets move in elliptical orbit in the same direction around the Sun, and they lie in almost the same plane except ____ pluto
the earth travels around the Sun once a year. the earth spins on its axis once each ____ day
the force that an object exerts on a given unit of area is called _____ pressure
an element that is naturally radioactive is _______ radium
when sugar dissolved in water, the water is called the ______ solvent
a jackscrew is a combination of an inclined plane and a ______ screw
the movement of one object over another is slowed down by ____ friction
in order to work, some machines use the energy contained in ____ fuel
the energy contained in fuel is an example of _____energy chemical
oil is put on the bearing of wheels to reduce ____ friction
when coal is burned, stored energy is being released in the form of _____energy thermal
alum is used in the process of water purification called ____ coagulation
______ is often used in water purification to kill some harmful bacteria chlorine
the process of ___ is used to produce water that is chemically pure distillation
solids mixed in water can be removed by ____ filtering
one way to determine whether water has minerals dissolved in it is to boil the water to see if there is a ____ residue
water that has just been boiled will taste flat because ____ has escaped from the water dissolved air
the sense organs found at the side of the papillae are known as ____ taste buds
clear water still contains bacteria and other organism. a chemical should be added to sterilize it. the chemical most commonly used is ___ chlorine
____ is the source of all water in the world sea
which part of the tongue is sending most messages to the brain when you taste vinegar? side
the process whereby organic matter is broken down and goes back to the soil is called ____ decay
in which part of the flower is pollen produced? anther
_____ is the male reproductive part of the flower stamen
fertilization in the flower results in the production of ___ seed
when bulbs are connected in ____ circuit, the current in all parts of the circuit is the same series
the appliances used in the house should be connected in _____ circuit with the main supply parallel
if you are going to connect two light bulbs in one battery, which circuit arrangement would be more practical to use? parallel
the gas that plays an important role in the process of burning is ___ oxygen
the strongest intermolecular force of attraction exists in ___ solid
producers refer to the green plants that make food. fungi and bacteria which feed on dead plants and animals are known as _____ decomposers
consumers can be classified as primary, secondary and tertiary according to the type of food they eat. primary consumers feed directly on green plants. they are also known as ____ herbivores
any animal that feeds on bird, rabbit, mouse or any other secondary consumer is called ____ tertiary consumer
the most abundant element on the earth's crust is ____ oxygen
metals are hard, shiny solids, with the exception of the only liquid metal which is ___ mercury
the hardest substance known is a non-metal. it is made up of carbon. it is ____ diamond
when acid is mixed with a base, salt is produced. this process is called _____ neutralization
the chemical name of common salt is ____ sodium chloride
sodium hydroxide is an example of a/an ____ base
animals with backbones are called ____ vertebrates
the backbone is not a single bone. instead it is made up of several bones called ______ vertebrae
inside the backbone, the bundle of nerves which connects the brain to other parts of the body is known as ____ spinal cord
a magnifying lens contains ____lens which tend to make the objects appear larger convex
a lens that is thinner in its center than at its edges and spreads light apart is called ___ lens concave
bacteria can be classified according to shape. bacteria that are sphere-shaped or globular are called ____ cocci
some microorganisms can cause diseases. these are known as ____ pathogens
in a transverse wave, the distance from one wave crest to another is known as ____ crest
waves that have the longest wavelengths and are used to carry telephone calls, mobile phone transmission and picture signal over long distances are ___ radiowaves
the highest point of the wave is known as ___ crest
_____ waves are transverse waves that carry energy in a way related to electricity and magnetism, examples of which are radiowaves, ultraviolet waves and gamma rays electromagnetic
during germination, the seed enters a state of being very dry. they can remain alive but inactive for a long period of time. this stage is known as ____ dormancy
the first part of the embryo to emerge from the seed is called ___ radicle
the structure that covers and protects the seed from injury is called ____ seed coat
the seed tissue which stores food for the embryo is ____ cotyledon
the tube that runs from the mouth to the anus is called the _______ alimentary canal
the series of wave-like muscular movements which moves the food down the alimentary canal is known as ____ peristalsis
this is a liquid inside the stomach that contains dilute hydrochloric acid and enzymes which aid in digestion pancreatic juice
the process of breaking down food into smaller molecules that can be absorbed by the body is called ___ digestion
enzymes are special proteins that hasten chemical reaction; they speed up chemical reactions without themselves getting directly involved. the enzyme found in saliva is ____ amylase
if you leave iced water for several minutes, you will see droplets of water form outside the glass. this process is called ____ condensation
what type of eclipse occurs when the moon passes between the sun and the earth? solar eclipse
a ___ eclipse occurs when the moon passes into the Earth's shadow lunar
the most abundant gas in the atmosphere which makes up 78% of it is ____ nitrogen
energy is transferred from the sun to the earth by ___ radiation
the ____ is a layer in the atmosphere which has a beneficial effect of absorbing harmful ultraviolet rays stratosphere
particles or waves given off by atoms undergoing nuclear decay produce ____ radiation
similar organisms which are able to produce offspring that can also reproduce are grouped under _____ species
animals that are able to keep a constant body temperature are warm-blooded or ____ endothermic
invertebrates with six legs and three body parts are _____ insects
the remains or traces of an organism that was once alive is a _____ fossil
water is a combination of hydrogen and oxygen atoms. it is considered as _____ compound
two or more substances mixed together but not joined chemically form a/an _____ mixture
the anvil, hammer and ____ make up the bones of the ears stirrup
light travels with a speed of _______ km/s 300,000
layers of pollutants in the air caused by exhaust gases from automobiles which reacts in sunlight is called _____ smog
wastes that can be broken down by the action of bacteria is _____ biodegradable
____ is a part of the topsoil formed by the decay of once living organisms humus
the force that keeps the earth in orbit around the sun is ____ gravity
what happens to the oxygen released during photosynthesis? it is returned to the atmosphere
how does the skin protect the body from bacteria? the skin prevents bacteria from entering the body
what happens when a skydiver jumps off from a plane? he falls with increasing speed
Earthquakes frequently occur in Japan because______ Japan is within the Pacific Belt of Fire
Atoms of 6C12 and 6C14 has a difference of two _____ neutrons
choloroflourocarbon (CFC) is one of the substance known to cause _________ in the stratosphere thus causing global warming ozone depletion
the symbiotic relationship between dog and fleas is called _____ parasitism
this is considered to be the largest gland located at the upper part of the body and at the right abdominal cavity liver
the _____ of vertebrates function to excrete unwanted chemicals, including salt kidneys
the spreading out of colors when light shines through a prism is called ___ dispersion
which of the heart's chambers receive oxygenated blood from the lungs? left atrium
an object which is white ______ all light reflects
the amount of energy in living systems _____ as one goes higher in the energy pyramid decreases
a sea water plant was exposed to increasing light intensities, after some time, formation of bubbles was observed, this means that the plant undergoes _____ respiration
sound waves can only travel through a medium. it travels fastest in ______ solid
the bending of light is called ______ refraction
if you place a moth ball in your dresser, it will get smaller after some time. this is because it'll undergo the process of ____ sublimation
in what medium will the speed of light be the fastest? vacuum
dstance is measured by multiplying the speed and the ____ time
a falling stone hits the ground. what happens to its kinetic energy? it is converted to potential energy
the main product of combustion is ____ carbon dioxide
the instrument used to measure atmospheric pressure is ______ barometer
the process whereby acid and base are combined is called _____ neutralization
air is a mixture, solution or compound? solution
the state of matter that exists only at very high temperature and consists of electrically charged particles is _______ plasma
the condition which occurs when the atmospheric pressure is equal to the vapor pressure boiling
the measure of the average kinetic energy of the particles in matter is ____ temperature
as heat is added to a material, the kinetic energy of its particles increases thus volume increases and the material ____ expands
a substance that does not allow heat and electricity to pass through is called ______ insulator
a magnet that holds its magnetic properties over a period of years is callled a _______. it is made up of either iron, cobalt or nickle permanent magnet
the radioactive element that is used for measuring the age of very old rocks carbon-14
the main cause of tides is____ the pull of the moon and the sun on the earth
the river deposit at the mouth of a river in a lake or ocean is called ____ delta
in the water cycle, at which point is water most pure? in rain
the sun heats the sea and some of the water becomes vapor. The vapor collects as clouds. When these are blown over high ground they release water as rain in the process known as ______ precipitation
th four main kinds of taste are____ sweet, sour, salty and bitter
in freezing, liquid changes to solid. what happens in condensation? gas changes to liquid
if your hand touches a hot object, you will pull it away immediately. This action is known as ____ reflex action
majority of bacteria are harmless and some are even beneficial to man. The bacterium commonly known to help is proper food digestion is _____ lactobacillus
________ is a fatal disease caused by a bacteria known as vibrio cholerae cholera
why does copper sink in water while oak wood floats? an object with higher density than water sinks while an objects with lower density than water floats
why is it easier to float in the sea than in a lake? sea water is denser than fresh water
why does ice float in water? ice has lower density than water
there are two types of solar eclipse. It is __________ when the face of the sun appears to be completely covered or eclipse by the moon. total eclipse
the four most important gases in the atmosphere are _____ oxygen, carbon dioxide, nitrogen and argon
a small, hot planet will most likely have ____ no atmosphere
a ______ is a symbiotic association of fungi and algae lichen
carbon monoxide exuded by vehicles is dangerous when inhaled in great amount because _____ it competes with oxygen for binding with red blood cells
refining metal ore using heat is an example of _____ change chemical
a seed planted upside down so that its root end is facing up & its shoot end is facing down, but after germination the root grows downward & the shoot grows upward. this is an example of what process? phototropism and geotropism
the correct sequence of biological organization from lowest to highest molecules > cell > organ > population > community
density is the amount of matter in a given space. which has greater density, a lake full of water or a cupful of lake water? both have the same density
in a _____ relationship, the two organisms live closely to each other symbiotic
objects seem to be heavier on earth than the moon because _____ earth has stronger gravitational pull than the moon
Created by: karlo