Unit 2: Respiration and Photosynthesis

Question 1

What is the equation for respiration?

Answer 1

O2+glucose—CO2+water+energy

Question 2

What is the equation for photosynthesis?

Answer 2

CO2+water—-glucose +O2

Question 3

In darkness (no light) what can only take place?

Answer 3

Respiration can only take place.
Carbon dioxide levels will increase.

Question 4

In low light conditions (eg. dawn or dusk) what will occur?

Answer 4

Respiration occurs, but now because of the light, photosynthesis can also occur.
But it does not happen at a fast rate because of the low light level. Rates of photosynthesis and respiration are equal.
Carbon dioxide levels will be level - this is known as the compensation point, and there is no net gas exchange

Question 5

In bright light conditions what occurs?

Answer 5

Respiration still occurs but photosynthesis happens at a much faster rate. carbon dioxide levels will decrease.

Question 6

What can be used to determine the movement of carbon dioxide and oxygen into and out of plants?

Answer 6

Hydrogen carbonate indicator

Question 7

What colour is hydrogen carbonate indicator in normal atmospheric carbon dioxide levels?

Answer 7

Red

Question 8

What colour is hydrogen carbonate indicator if there is an increase in carbon dioxide levels?

Answer 8

Yellow

Question 9

What colour is hydrogen carbonate indicator if carbon dioxide levels decrease?

Answer 9

Purple