8th grade exam - version 2
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Questions and Answers

What do herbivores eat?

  • Dead/decaying organisms
  • Animals
  • Plants (correct)
  • Both plants and animals

What do carnivores eat?

  • Plants
  • Animals (correct)
  • Both plants and animals
  • Dead/decaying organisms

What do decomposers feed off and break down?

  • Both plants and animals
  • Dead/decaying organisms (correct)
  • Plants
  • Animals

What must a habitat provide for an organism to survive and reproduce?

<p>Food, water, shelter, and living space (A)</p> Signup and view all the answers

Which of the following is NOT a requirement for an organism's habitat?

<p>Abundance of predators (B)</p> Signup and view all the answers

Which of the following is an example of a biotic factor?

<p>Grass (B)</p> Signup and view all the answers

What category do temperature and humidity fall under in the needs of living things?

<p>Abiotic factors (A)</p> Signup and view all the answers

Which of the following is a characteristic of abiotic factors?

<p>They are essential for photosynthesis (D)</p> Signup and view all the answers

What is the smallest particle of an element that has the properties of that element?

<p>Atom (D)</p> Signup and view all the answers

Which of the following is an example of an element?

<p>Na (B)</p> Signup and view all the answers

Which of the following is considered the simplest pure substance?

<p>Element (C)</p> Signup and view all the answers

Pure substances consist of two or more different substances, not chemically joined together.

<p>False (B)</p> Signup and view all the answers

A mixture consists only of one element or one compound.

<p>False (B)</p> Signup and view all the answers

A pure substance has only one type of molecule in it.

<p>True (A)</p> Signup and view all the answers

What is the study of matter?

<p>Chemistry (B)</p> Signup and view all the answers

What does matter include?

<p>Solids, liquids, and gases (A)</p> Signup and view all the answers

Which state of matter takes on the shape of the container it is in?

<p>Liquids (D)</p> Signup and view all the answers

Which state of matter spreads to fill the space it is in?

<p>Gases (A)</p> Signup and view all the answers

Which state of matter is hard to compress and holds its own shape?

<p>Solids (D)</p> Signup and view all the answers

Which state of matter spreads to fill the space it is in?

<p>Gases (D)</p> Signup and view all the answers

True or false: Solids and liquids can be compressed?

<p>False (B)</p> Signup and view all the answers

True or false: Gases can be compressed?

<p>True (A)</p> Signup and view all the answers

What makes particles move faster and break free of the forces holding them together?

<p>Heat (energy) (B)</p> Signup and view all the answers

Which of the following determines whether a change is classified as physical or chemical?

<p>The production of new substances (D)</p> Signup and view all the answers

What type of change occurs when ice-blocks melt in a drink?

<p>Physical change (A)</p> Signup and view all the answers

Which state of matter has a definite shape and volume?

<p>Solid (C)</p> Signup and view all the answers

What does a mixture consist of?

<p>Two or more different substances not chemically joined together (D)</p> Signup and view all the answers

Homogeneous mixtures have components that cannot be distinguished from each other, appearing as one substance.

<p>True (A)</p> Signup and view all the answers

Heterogeneous mixtures have all components of the mixture visible because they do not mix together.

<p>True (A)</p> Signup and view all the answers

In homogeneous mixtures, particles are distributed evenly throughout. In heterogeneous mixtures, particles are not distributed evenly.

<p>True (A)</p> Signup and view all the answers

What is the characteristic of homogeneous mixtures?

<p>Components cannot be distinguished from each other (B)</p> Signup and view all the answers

What is the characteristic of heterogeneous mixtures?

<p>All components are visible and do not mix together (A)</p> Signup and view all the answers

What is the primary function of a habitat for an organism?

<p>To provide resources for survival and reproduction (A)</p> Signup and view all the answers

What is the main purpose of very long roots in plant adaptation?

<p>To take in water (C)</p> Signup and view all the answers

In which type of interdependence do both organisms benefit from the relationship?

<p>Mutualism (B)</p> Signup and view all the answers

Match the following dietary habits with their descriptions:

<p>Herbivores = Only eat plants Carnivores = Only eat animals Omnivores = Eat both plants and animals Decomposers = Feed off and break down dead/decaying organisms</p> Signup and view all the answers

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