ACT Science Prep

A student wants to test the effects of type of exercise on heart rate.  What would be a proper hypothesis?

• If type of exercise affects the heart rate of a person, then jumping jacks will increase the heart rate the most
• Jumping jacks will cause the highest heart rate
• Exercise increases heart rate
• If exercise affects heart rate, jumping jacks will increase heart rate the most

A student wants to test the effects of type of exercise on heart rate.  What would be a good experimental group?

• jumping jacks, push-ups, sit-ups, jogging in place, lunges
• standing heart rate

Cattle have mainly fed on grass in a particular region in Texas for the past 40 years. Recently, the population of cattle has doubled. What effects might this growth have on the ecosystem?

• The cattle are diseased.

• Next year, the cattle population will have tripled.

• The cattle need more space or more grass.

• The cattle need less space or less food.

During an investigation, Rachel placed two spoons in a pan of water on a heated hot plate. One spoon was made of wood and the other was made of metal. After several minutes, the metal spoon became much hotter than the wooden spoon. This most likely happened because:

• Wood is a good insulator; metal is a good conductor.

• Both are good thermal conductors.

• The wooden spoon was larger, therefore harder to heat.

• Wood reflects thermal conduction.

According to recent temperature trends in New York City, one might predict which temperature on day 7?

• 59

• 83

• 67

• 72

Jane is setting up an experiment involving bean plants. She places a bean inside a damp paper towel, then places it inside a Ziploc bag. She takes another bean but places it inside a dry paper towel. She tapes both Ziploc bags to her classroom window next to each other. She checks each day to observe and record the data. Jane is most likely invesitgating which hypothesis:

• Beans cannot grow in a paper towel.

• Amount of sunlight affects how fast beans grown.

• What does a bean look like once it's sprouted?

• A dry bean grows quicker than a damp bean.

Which of these would cause pain in human ears?

• anything over 0 db

• 160 db

• 40 db

• 118 db

This type of cell needs a cell wall and chloroplasts

• Plant cell
• Animal Cell
• Bacteria

The powerhouse of the cell is the...It converts energy from food into energy the cell can use

• Mitochondrion
• Golgi body
• Nucleus
• Ribosomes

Which sentence is written correctly?

• Since 1987, scientists have been suggesting we switch to cleaner fuel sources.

• Since 1987 scientists have been suggesting we switch to cleaner fuel sources.

• Since 1987, scientists have been suggesting we switch to cleaner, fuel sources.

• Since 1987 scientists have been suggesting we switch to cleaner, fuel sources.