B8

Question 1

What is the role of chlorophyll in photosynthesis?

Answer 1

It traps the light energy needed for photosynthesis

Question 2

How are leaves adapted for photosynthesis?

Answer 2

-Broad, flat shape increases surface area
-Thin, so short diffusion path
-Guard cells open stomata to allow for diffusion of gases
-Photosynthetic cells contain chlorophyll
-Veins contain xylem, which brings water to the leaves and phloem, which takes glucose away

Question 3

What factors affect the rate of photosynthesis?

Answer 3

-Light intensity
-Temperature
-The amount of chlorophyll
-Concentration of carbon dioxide

Question 4

Why does photosynthesis slow down in cold conditions?

Answer 4

Photosynthetic enzymes aid photosynthesis, and enzymic activity slows down in cold conditions

Question 5

If a certain factor stops the rate of photosynthesis increasing, it is called the….

Answer 5

Limiting factor

Question 6

List some methods of increasing a farmer’s yield of crops:

(Considering specifically how they would optimise photosynthesis)

Answer 6

-Hydroponic growth system delivers all essential nutrients to plants
-Artificial lighting extends the hours in which photosynthesis can take place

Question 7

Why would a lack of photosynthesis cause stunted growth?

Answer 7

The plant makes less sugar, so there is less conversion of sugars into protein for growth

Question 8

Why is controlling the different photosynthesis factors important in greenhouses?

Answer 8

By controlling plant conditions and photosynthesis, photosynthetic rate can be optimised leading to faster growth and higher yield