Unit 7 revision

Air is a mixture of gases. It consists of about 78% of _________________.

If the glowing splint does not relight when put into a test tube of gas, we can concluded that the gas is carbon dioxide.

• True

• False

Water can turn blue _______________paper to pink.

The photo shows a piece of dry ice. It is used on stages to produce a fog effect. It is actually

• nitrogen.

• oxygen.

• carbon dioxide.

• helium.

Which of the following is NOT a use of noble gases?

• To fill light bulbs

• To fill balloons and air ships

• To fill advertising lights

• To store living cells and tissues

Green parts of plants contain a green pigment called ___________ that can absorb light energy for photosynthesis.

Carbon dioxide and starch are products of photosynthesis.

• True

• False

Which of the following is the correct sequence for the test?

• (1), (2), (3), (4)

• (1), (3), (2), (4)

• (2), (1), (3), (4)

• (2), (3), (1), (4)

What is the independent variable of this invesitgation?

• presence of water

• presence of chlorophyll

• presence of carbon dioxide

• presence of light

Which of the following will affect the rate of photosynthesis of a plant?

• The amount of carbon dioxide

• The intensity of sunlight

• The amount of fertilizer in the soil