Limiting Factors

Question 1

What is the conclusion from the experiment that tested the effect light intensity had on the rate of photosynthesis? (2 points)

Answer 1

• as the light intensity on the pondweed increases, the number of bubbles produced per minute also increase
• this is because the greater the light intensity, the more energy is absorbed by the leaf+ the rate of photosynthesis increase

Question 2

Why is it not necessary to cut the grass in january, February or December?

Answer 2

Low light and temperature levels so grass doesn’t grow as fast

Question 3

Why is it necessary to cut most often in June or July?

Answer 3

Because this is when it summer time so The grass grows faster with more sun light

Question 4

How does light intensity affect the rate of photosynthesis?

Answer 4

• increasing light intensity increases the rate of photosynthesis but only up to a point, when carbon dioxide or temperature become limiting

Question 5

What will happen if the light intensity is increased past a certain point?

Answer 5

• when light intensity is increased past this point the rate of photosynthesis will remain constant because something else must be in short supply

Question 6

What is a limiting factor?

Answer 6

• shortest supply for the plant that limits the rate of photosynthesis

Question 7

What are three factors that can limit photosynthesis?

Answer 7

• light intensity
• availability of carbon dioxide
• temperature

Question 8

What is the effect of carbon dioxide levels on photosynthesis?

Answer 8

-Increased carbon dioxide concentration increases the rate of photosynthesis but only up to a point, when light or temperature become limiting

Question 9

What is the effect of temperature on the rate of photosynthesis?

Answer 9

Increases temperature increases the rate of photosynthesis but only up to a point, then the enzymes are denatured and the rate drops

Question 10

Why does light intensity being increased, increase the rate of photosynthesis?

Answer 10

Because light provides the energy for photosynthesis so the more energy the faster the rate

Question 11

Why does carbon dioxide concentration being increased, increase the rate of photosynthesis?

Answer 11

Because carbon dioxide is a reactant in photosynthesis so the more carbon dioxide the faster the rate

Question 12

Why does the temperature increase the rate of photosynthesis but then decreases it after a certain point?

Answer 12

Because the enzymes in the plant become denatured and are therefore unable to bind their substrates