2.2.1 Photosynthesis

Question 1

What is a producer?

Answer 1

An organism that can make its own food e.g. plants and algae

Question 2

Give 2 examples of producers.

Answer 2

Plants

Algae

Question 3

By which process do plants produce their own food?

Answer 3

Photosynthesis

Question 4

How are algae different to plants?

Answer 4

• The can be unicellular or multicellular
• They live underwater
• Algae do not have stems, roots or leaves.

Question 5

How are plants different to algae?

Answer 5

• They are all multicellular
• They live mostly on land
• They have stems, roots and leaves

Question 6

What is a consumer?

Answer 6

Organisms that have to eat other organisms to survive e.g. animals are consumers

Question 7

What is the equation for photosynthesis?

Answer 7

Carbon dioxide + water + sunlight –> glucose + oxygen

Question 8

Name the reactants of photosynthesis.

Answer 8

Carbon dioxide + water

Question 9

Name the products of photosynthesis.

Answer 9

energy + oxygen

Question 10

Where does photosynthesis take place inside plant or algal cells?

Answer 10

Within the chloroplasts

Question 11

What is the name of the green pigment found inside chloroplasts?

Answer 11

Chlorophyll

Question 12

What does chlorophyll do?

Answer 12

Captures light energy inside the chloroplasts

Question 13

Describe the journey of water through a plant.

Answer 13

• Water enters through the root hair cells of the roots.
• Water travels through tubes called xylem tubes.
• Water evapourates out of the leaves.

Question 14

How do gases enter and exit a plant?

Answer 14

Through tiny holes in the underside of leaves called stomata.

Question 15

Which gas enters leaves?

Answer 15

Carbon dioxide

Question 16

Which gas exits leaves?

Answer 16

Oxygen

Question 17

Name the tubes that water travels through inside plants

Answer 17

xylem tubes

Question 18

Name the parts of a plant that contain chloroplasts.

Answer 18

Leaves

Stem (small amount)

Question 19

Why do roots not contain chloroplasts?

Answer 19

Because they are underground so cannot capture sunlight.

Question 20

Plants store the glucose produced in photosynthesis as…

Answer 20

starch

Question 21

How can we test a leaf to see if it doing photosynthesis?

Answer 21

Use iodine on it to test for starch.

Question 22

What colour does iodine change to if starch is present?

Answer 22

From orange to blue/black

Question 23

What must we do to a leaf before putting iodine on it when testing for starch?

Answer 23

Heat in ethanol to remove the green chlorophyll so that we can see if the iodine changes colour.