ACT Science Test 5

Front

What is the significance of paleo wildfires in geological history?

Back

Paleo wildfires provide insights into past environmental conditions, climate changes, and the evolution of ecosystems over millions of years.

Front

What does %O2 represent in combustion experiments?

Back

%O2 represents the percentage of oxygen in the air, which affects the duration and intensity of combustion.

Front

Define photosynthesis.

Back

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll, converting carbon dioxide and water into glucose and oxygen.

Front

What is the role of pigments in plants?

Back

Pigments in plants, such as chlorophyll, are essential for absorbing light energy during photosynthesis.

Front

How can the duration of a flame be affected by the type of material burned?

Back

Different materials have varying chemical compositions and moisture content, which can influence the efficiency and duration of combustion.

Front

What is the relationship between the number of known paleo wildfires and geological time?

Back

The number of known paleo wildfires can indicate the frequency and intensity of wildfires over geological time, reflecting changes in climate and vegetation.

Front

What does a graph showing flame duration indicate?

Back

A graph showing flame duration can illustrate how different materials burn under varying conditions, such as oxygen levels.

Front

Explain the importance of experimental controls in scientific studies.

Back

Experimental controls are essential to ensure that the results of an experiment are due to the variable being tested and not other factors.

Front

What is the purpose of a scientific passage in a test?

Back

A scientific passage provides context and information necessary for answering related questions, testing comprehension and application of scientific concepts.

Front

How do green-stemmed and purple-stemmed plants differ in photosynthesis?

Back

Green-stemmed plants typically contain chlorophyll, allowing them to perform photosynthesis, while purple-stemmed plants may have different pigments that also contribute to this process.