8th grade science

Multiple Choice

What organelle do plants have surrounding their cells that animals lack?

• Cell Wall

• Woody Stems

• Cell Membrane

• Sharp Thorns

Multiple Choice

Which organelle is only found in a plant cell?

• nucleus

• chloroplast

• mitochondria

• cell membrane

Multiple Choice

The table shows the number of neutrons, protons, and electrons for two atoms. How are the two atoms alike?

• They have the same charge.

• They have the same mass number.

• They have the same atomic number

• They are atoms of the same element.

Multiple Choice

When plants undergo photosythesis they produce--

• carbon dioxide

• oxygen

• hydrogen

• nitrogen

Multiple Choice

When species feeds on another, it is called

• predation

• ecosystem

• change

Multiple Choice

The diagram shows the arrangement of electrons in a neon atom. How many protons are present in this atom's nucleus?

• 10

• 8

• 2

• There is not enough information to answer this question.

Multiple Choice

Carnivores eat

• plants

• meat

• both plants and meat

Multiple Choice

Herbivores eat

• plants

• meat

• both plants and meat

Multiple Choice

A burning candle is the process of transforming--

• heat energy into chemical energy

• chemical energy into light and heat

• chemical energy into mechanical energy

• chemical energy into nuclear energy

Multiple Choice

Omnivores eat

• plants

• meat

• both meat and plants

Multiple Choice

An interaction between organisms or species for resources - food, shelter, etc.

• predation

• competition

• ecosystem

Multiple Choice

In the diagram, the arrows labeled III point to the atom's ______________.

• Protons

• Neutrons

• Nucleus

• Electrons

Multiple Choice

Intraspecific Competition is

• competition between the

  same species

• competition between different species

Multiple Choice

Interspecific competition is

• competition between the same species

• competition between different species

Multiple Choice

Which of the organisms in a forest ecosystem is an example of a producer?

• grasshoppers

• plants

• owls

• frogs

Multiple Choice

A relationship between two species of organisms that both benefit from the relationship

• mutualism

• parasitism

Multiple Choice

A relationship between two organisms in which one benefits or lives off the other is called

• mutualism

• parasitism

Multiple Choice

Elements with seven valence electrons —

• are highly reactive

• are highly stable

• have a high mass

• have a low mass

Multiple Choice

A group of individuals of one species in an area is called the

• population

• competition

Multiple Choice

A living feature of an ecosystem (plants, animals, leaves, etc.) Carbon Cycle - the transfer of carbon through naturally occurring processes between organisms and the environment

• biotic factor

• predation

Multiple Choice

A tapeworm lives in human intestines, absorbing the nutrients that would normally be absorbed by the person. This eventually causes the person health problems. The relationship between the tapeworm and the human is -

• parasite/host

• predator/prey

• herbivore/omnivore/omnivore

• consumer/producer

Multiple Choice

An association between two organisms in which one benefits and the other derives neither benefit nor harm.

• Biotic Factor

• Commensalism

Multiple Choice

A non-living feature of an ecosystem (rock, water, sun, etc.) Biodiversity - the variety of life in the world or in a particular ecosystem or habitat is called

• Biotic Factor

• Abiotic Factor

Multiple Choice

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is sodium, and it is highly reactive

• The element is fluorine, and it is highly reactive

• The element is sodium, and it is not very reactive

• The element is fluorine, and it is not very reactive

Multiple Choice

Symbiosis is

• a mutually beneficial relationship between different people or groups.

• competition between the same species.

Multiple Choice

Ecosystems are

• when one species of animal eats another animal

• a biological community of interacting organisms and their physical environment

Multiple Choice

During which phase does the Moon receive sunlight only on the side facing away from the Earth?

• full moon

• new moon

• waning gibbous

• waxing gibbous

Multiple Choice

Which of these elements would have properties most similar to arsenic (As)?

Use the periodic table and your notes slides.

• Silicon (Si)

• Selenium (Se)

• Tin (Sn)

• Phosphorus (P)

Multiple Choice

Which of the following is an example of static electricity?

• A dry cell battery connected to wires lights up a light bulb

• A balloon sticks to a wall after it is rubbed with a piece of wool

• A magnet sticks to a refridgerator door made of metal

• a light switch that is turned on runs a ceiling fan

Multiple Choice

Sulfur is a nonmetal. Of the following, the physical characteristic that is most

likely to describe a sample of sulfur is —

• a shiny appearance

• brittleness

• malleability

• ductility

Multiple Choice

A coal-burning facility is constructed in an area containing several pond ecosystems. How will this human activity most likely affect the pond ecosystems?

• More nutrients will be available.

• Organism diversity will increase.

• Disease will become less common.

• Water quality will be reduced.

Multiple Choice

How many of each atom are in the compound above?

• 1 magnesium atom, 2 iron atoms, and 4 oxygen atoms

• 3 magnesium atoms, 2 iron atoms, and 4 oxygen atoms

• 6 magnesium atoms, 6 iron atoms, and 12 oxygen atoms

• 3 magnesium atoms, 6 iron atoms, and 12 oxygen atoms

Multiple Choice

The illustrations shows a wave.  The wavelength is the distance between points--

• 1 and 2
• 1 and 4
• 2 and 3 
• 2 and 4

Multiple Choice

Potassium nitrate is a compound used in some fertilizers. Its chemical formula

is KNO3. How many TOTAL atoms are in each unit of potassium nitrate?

• 2

• 5

• 3

• 9

Multiple Choice

Which is an SI metric unit measurement that is used to record the heat transfer of a solution in a classroom investigation?

• Liter

• Newton

• Volt

• Degree Celsius

Multiple Choice

Look at the pictures above. A shows the bag before the vinegar and baking soda are mixed together, and B shows it after they are mixed together. In which picture do the contents of the bag have the greater mass?

• The mass is greater in A—before they are mixed.

• The mass is greater in B—after they are mixed.

• The mass is the same in both.

• The mass depends on the temperature.

Multiple Choice

Expansion joints such as these are put on bridges because the concrete expands and contracts. This happens when -

• chemicals get on the concrete
• the temperature changes
• the amount of light changes
• the concrete gets wet

Multiple Choice

Which of the following is the best clue that a chemical reaction has taken place?

• Change in color

• Change in state

• Change in particle size

• Change in volume

Multiple Choice

Which instrument would most accurately and precisely determine the mass of a toy car?

• An electronic light meter
• A spring scale
• A triple-beam balance
• A graduated cylinder

Multiple Choice

A student uses a magnet to move a .04 kg ball bearing. The magnet exerts a force of 4N, which causes the ball bearing to begin moving. What is the acceleration of the ball bearing when it begins to move?

• .01 m/s2

• .16 m/s2

• 3.96 m/s2

• 100 m/s2

Multiple Choice

A mixture of iron filings and sulfur can easily be separated by--

• placing the mixture in water

• performing a chemical reaction

• heating the mixture

• using a magnet

Multiple Choice

While practicing in a simulator, an astronaut experienced an acceleration of 26 m/s2. The astronaut's mass was 63.0 kg. In Newtons, what force did the astronaut experience?

• 2.42 N

• 37 N

• 1638 N

• 42,588 N

Multiple Choice

Which organelle functions as a place to store extra water?

• Vacoule

• Chloroplasts

• Nucleus

• Cell membrane

Multiple Choice

In this model, which particle determines the reactivity of this atom?

• Particle W

• Particle X

• Particle Y

• Particle Z

Multiple Choice

DNA is essential to living organisms because it---

• carries the genetic code

• is a spiral helix

• can prevent diseases

• can break apart

Multiple Choice

Which table is correct? (use your periodic table and notes slides)

Multiple Choice

Abiotic or Biotic: Water

• Abiotic

• Biotic