Ch 1 Be a Third Grade Scientist! Texas Science McGraw Hill

What is a set of procedures scientists follow to answer a question called?

• phenomenon

• investigation

• impact

• engineer

Answer explanation

The correct answer is 'investigation' because it refers to the systematic set of procedures scientists use to explore questions and gather evidence, distinguishing it from other terms like 'phenomenon' or 'impact'.

Which structure is evidence that this animal lives in the water?

• Gills

• Wings

• Legs

• Fur

Answer explanation

Gills are specialized structures that allow aquatic animals to extract oxygen from water, indicating that the animal lives in a water environment. The other options, such as wings, legs, and fur, do not provide evidence of aquatic life.

A possible sequence for the engineering design process is

• Test a design
• Market the product
• Brainstorm a solution
• Identify a problem
• Develop a design

Which tools keep you safe during investigations?

Choose all that apply!

• 
• 
• 
• 

Answer explanation

Safety goggles protect your eyes from harmful substances, gloves prevent skin contact with hazardous materials, and an apron shields your clothing and body. These tools are essential for safety during investigations.

Criteria are the first models of a design.

• True

• False

Answer explanation

The statement is false because criteria are not models; they are standards or principles used to evaluate designs. Models are actual representations or prototypes created based on those criteria.

(a)   is when someone observes something for the first time.

• science

• investigation

• observation

• A discovery

Answer explanation

A discovery is defined as the act of observing something for the first time. In this context, it perfectly fits the description provided in the question.

What is an innovation?

• something that repeats

• something observed for the first time

• a copy of a real object

• a new product, process, or idea

Answer explanation

An innovation refers to a new product, process, or idea that introduces something novel. This distinguishes it from mere repetition, observation, or copying, making 'a new product, process, or idea' the correct definition.

Approximately when did Cai Lun invent paper?

• 100

• 200

• 300

• 400

Answer explanation

Cai Lun is credited with the invention of paper around 105 AD, which is approximately the year 100. This innovation significantly impacted communication and record-keeping in ancient China.

Which image shows a model of Earth?

• 
• 
• 
• 

Answer explanation

The correct choice is 'Map of the world' because it represents a model of Earth, showing geographical features and locations, unlike the other options which depict natural landscapes.

Stability is when a system is unchanging or when it changes in a predictable way.

• True

• False

Answer explanation

The statement accurately defines stability as a state of being unchanging or changing predictably. Therefore, the correct answer is True.