PSSA Science 8

Which of the following statements is part of the cell theory? 

• All cells come from pre-existing cells.
• Cells are the basic units of living things.
• All living things are made up of one or more cells.
• all of these

According to the law of conservation of matter, the number of ________ is not changed by a chemical reaction. 

• products
• molecules
• bonds
• atoms

An ecosystem that offers many different niches 

• supports animal life but not plant life.
• cannot support very many species at once.
• can support many different species.
• usually only supports insect life.

Which of the following bodies of water are included in the freshwater biome? 
I. Rivers
II. Oceans
III. lakes
IV. Streams

• I, III, and IV only
• II only
• I and IV only
• I, II, III, and IV

When precipitation falls onto land surfaces, it is either soaked into the ground or becomes runoff. Runoff is surface water that travels downhill and drains into streams and rivers.
The area of land where water is drained downhill into a body of water is known as a drainage basin, or _______. 

• delta
• aquifer
• watershed
• water table

The table above lists many features of an ecosystem in the taiga biome. Based on this table, what are the abiotic features of the taiga? 

• wide range of temperature, very little annual rainfall, foxes, bears, raccoons, birds, insects
• bears, foxes, raccoons, birds, insects, pine trees, fir trees, spruce trees, mosses
• mountains, lakes, wide range of temperature, very little annual rainfall
• mountains, lakes, spruce trees, fir trees, pine trees, mosses

Which of the following is true about mixtures and compounds? 

• A mixture contains different substances that are not chemically combined with one another.
• Mixtures and compounds are both made of two or more different substances.
• A compound forms when different substances chemically combine to form a new substance.
• all of these

Look at the picture of two different substances above. Which substance is a mixture? 

• Y and Z
• neither Y nor Z
• Z
• Y

Which of the following is a producer in the food web shown above? 

• grass
• ant
• snake
• sunlight

The diagram is an example of a ________.

• food pyramid
• food web
• food chain
• food diagram