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

Flashcards

Herbivores

Organisms that consume plants.

Carnivores

Organisms that consume animals.

Decomposers

Organisms that break down dead or decaying matter.

Habitat Requirements

Food, water, shelter, and living space.

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Biotic Factor

An organism's surroundings that is living.

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Abiotic Factors

Non-living parts of an organism's surroundings.

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Atom

The smallest unit of an element.

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Element

A pure substance consisting of only one type of atom.

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Chemistry

The study of matter and its properties.

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Matter

Anything that has mass and takes up space.

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Liquid

A state of matter that takes the shape of its container.

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Gas

A state of matter that spreads to fill its available space.

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Solid

A state of matter that holds its own shape and is hard to compress.

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Heat

Adding energy that makes particles move faster.

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Physical Change

Change that don't produce new substances.

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Solid

State of matter with definite shape and volume.

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Mixture

Two or more substances not chemically bonded.

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Homogeneous Mixture

Components evenly distributed and indistinguishable.

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Heterogeneous Mixture

Components visible and not evenly mixed.

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Habitat's Function

Resources for survival and reproduction.

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Long Roots in Plants

Absorbing water from the ground/soil efficiently.

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Mutualism

Both organisms benefit.

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