Biology 1 - Quiz

A student notices that the eraser on a pencil is very worn down and concludes that the person who used it probably made a lot of mistakes. Which science process skill is demonstrated by this conclusion?

• Observing

• Measuring

• Predicting

• Inferring

Answer explanation

This is an "educated guess" or explanation based on the observation of the worn-down eraser.

In which section of a scientific laboratory report should a researcher provide a step-by-step description of how the experiment was conducted, including all materials used?

• Discussion

• Introduction

• Results

• Methods

In the yeast experiment, a balloon is placed over the mouth of the bottle. What is the scientific purpose of the balloon?

• to mix the sugar, water, and yeast by mixing it

• to keep the contaminants to enter the bottle and killing the yeast

• to observe the production of gas byproduct from fermentation

• to prevent the warm water from cooling down too quickly

What is the primary product of yeast fermentation that causes the balloon to inflate in the described experiment?

• Oxygen

• Water vapor

• Sugar gas

• Carbon dioxide

Which section of a lab report provides a brief, compact summary of the entire study, including the aims, methods, main results, and conclusion?

• introduction

• conclusion

• abstract

• title

In an experiment involving testing how the addition of organic matter affects the growth of beans, the amount of light and water must be maintained consistently. These consistent factors are referred to as:

• Independent variables

• Dependent variables

• Integrated variables

• Controlled variables

In an experiment, the variable that is identified and manipulated by the experimenter, while keeping most other variables constant, is known as the:

• dependent variable

• independent variable

• controlled variable

• interpreted variable

Using words or graphic symbols to describe an action, object, or event, such as describing the change in height of a plant over time through a graph, is defined as which process skill?

• Observing

• Inferring

• Communicating

• Measuring

Which of the following is the best example of an evolutionary adaptation?

• A person developing stronger muscles after months of weight training.

• A desert plant species evolving thick waxy leaves to reduce water loss over generations.

• A dog learning to sit and stay through training.

• A human getting used to high altitudes after a few days in the mountains.

What usually happens to a predator population if the prey population decreases?

• The predator population increases quickly.

• The predator population stays the same.

• The predator population also decreases.

• The predator population turns into prey.

Answer explanation

When the prey population decreases, there is less food available for the predators. As a result: Some predators may starve or

• Have fewer babies because of limited resources.

So over time, the predator population also decreases.