PSSA Prep #2

Front

How is the germ theory of disease different from an opinion?

Back

The germ theory of disease is supported by evidence collected by many scientists over time, but opinions can be made without evidence.

Front

What inference is best supported by the data shown in the chart?

Back

The students’ heart rates increase with exercise.

Front

A fossil collector found crinoid fossils. What can the collector best infer about the area where the fossil was found?

Back

The area may once have been the site of an ocean.

Front

Lemonade Ingredients: 5 cups of sugar, 5 cups of lemon juice, 20 cups of water. Which statement describes a relationship between ingredients in this recipe?

Back

There should be 4 cups of water for every cup of lemon juice.

Front

Based on trophic levels, which classification of organisms is one degree of order higher than herbivores?

Back

secondary consumers

Front

A scientist examined a colorless gas with a density between 1.30 and 1.60 g/L and a boiling point between −190 and −180°C. The gas reacted with sodium (Na) metal. Based on the data, what is the most likely identity of the gas? Options: argon (Ar), fluorine (F2), hydrochloric acid (HCl), oxygen (O2).

Back

hydrochloric acid (HCl)

Front

Some organisms, such as mammals, have closed blood circulation systems. In mammals, blood is moved throughout the body inside blood vessels. Other organisms, such as insects, have open blood circulation systems. In insects, blood is moved to large spaces inside the body, where it comes into contact with tissue. Despite working in different ways, these blood circulation systems have similar purposes. Which statement correctly describes one of the purposes they share?

Back

Both systems move materials throughout the organism’s body.

Front

Characteristics of a Biome • extremely cold climate • low level of organism diversity • simple plant structures • limited water drainage • short growing season • large population changes Which biome is best described by these characteristics?

Back

tundra

Front

How do fires during dry seasons in the savanna biome illustrate the effect of diversity?

Back

It helps maintain overall ecosystem health and efficiency of resource use.

Front

Which statement correctly describes the reactants in the reaction CH4 + 2O2 → CO2 + 2H2O?

Back

CH4 and O2 are the reactants because they combine to form new compounds.