Science

Question 1

1Air we breathe out contains more

Easy

A. hydrogen B. helium C. carbon dioxide D. oxygen

Question 2

2Smoking damages the lungs and can cause

Easy

A. stronger lungs B. lung cancer C. healthy alveoli D. better breathing

Question 3

3Exhaled air contains no oxygen.

Medium

A. True B. False

Question 4

4Lime water turns milky with carbon dioxide.

Easy

A. True B. False

Question 5

5The voice box is the

Medium

A. pharynx B. trachea C. larynx D. bronchus

Question 6

6The liquid used to test for carbon dioxide is ___.

Easy

Your answer (fill in the blank)

Question 7

7Respiration without oxygen is ___ respiration.

Medium

Your answer (fill in the blank)

Question 8

8The windpipe is also called the

Easy

A. bronchiole B. larynx only C. trachea D. oesophagus

Question 9

9Yeast can respire without oxygen.

Medium

A. True B. False

Question 10

10Bread rises because yeast produces

Medium

A. carbon dioxide gas B. oxygen gas C. water only D. salt