7th Grade Cambridge Science Unit 1: PLANTS End of Unit Test

This gas is used by plants in photosynthesis.

• oxygen

• nitrogen

• carbon dioxide

• hydrogen

This gas is made by plants in photosynthesis.

• oxygen

• nitrogen

• carbon dioxide

• hydrogen

Plants get their water for photosynthesis from here.

• sunlight

• soil

• veins

• minerals

This green pigment absorbs energy from sunlight.

This tissue in a leaf is where most photosynthesis takes place.

• spongy layer

• upper epidermis

• palisade layer

• stomata

These tiny holes in a leaf allow gases to move in and out.

• spongy layer

• upper epidermis

• palisade layer

• stomata

Khanh did an experiment to compare the rate of photosynthesis of two types of seaweed.

The diagram shows the apparatus he used.

a. What variable should Anurag change in his experiment?

Khanh did an experiment to compare the rate of photosynthesis of two types of seaweed.

The diagram shows the apparatus he used.

Tick three variables that Khanh should keep the same.

• types of seaweed

• the volume of water they are immersed in

• the type of seawater

• the amount of light they get

• the volume of oxygen per minute

Khanh did an experiment to compare the rate of photosynthesis of two types of seaweed.

The diagram shows the apparatus he used.

c. What should Khanh measure in his experiment?

• the amount of oxygen per unit time

• the volume of water they are immersed in

• the type of seawater

• the amount of light they get

Which of the following describes how a plant obtains water? (Tick 3)

• from the sun

• from the soil

• through the roots

• through the soil

• from photosynthesis