Life On Earth 3- Photosynthesis

Question 1

Name the two stages of photosynthesis

Answer 1

Carbon fixtation and light reaction

Question 2

State what pigment traps light energy

Answer 2

Chloroplasts

Question 3

State the energy conversion which takes place in the light reaction

Answer 3

light energy> chemical energy

Question 4

State what the light energy splits and the fate of each product

Answer 4

light energy splits water into hydrogen and oxygen. the hydrogen is passed to carbon function. oxygen diffuses out the leaf via stomata as a waste product

Question 5

What controls carbon fixtation

Answer 5

Enzymes

Question 6

State the two products from the light reaction that is needed in carbon fixtation

Answer 6

hydrogen and APT

Question 7

State the gas which diffuses into the plant to combine with hydrogen to produce sugar

Answer 7

Carbon dioxide

Question 8

Give the summary word equation for photosynthesis

Answer 8

Carbon dioxide+ water >light> sugar+ oxygen

Question 9

Describe the three fates of the sugar produced

Answer 9

Starch for storage and glucose for

Question 10

State the three limiting factors of photosynthesis

Answer 10

• temperature
• light intensity concentration
• carbon dioxide concentration

Question 11

Describe the effect of these limiting factors on the plants rate of photosynthesis and growth

Answer 11

the rate of photosynthesis would go down if there is not enough light, CO2 or heat