Bioenergetics

Question 1

What does photosynthesis do

Answer 1

Produce glucose using light

Question 2

What’s the word equation for photosynthesis

Answer 2

carbon dioxide + water —-> glucose + oxygen

Question 3

What’s the balanced symbol equation for photosynthesis

Answer 3

6CO[2 ]+ 6H[2]0 —-> C[]6H[12]O[6] + 6CO[2]
Brackets = little numbers

Question 4

What do plants use glucose for

Answer 4

-Respiration
-Making cellulose
-Making amino acids
-Stored as oils and fats
-Stored as starch

Question 5

Why is glucose used in respiration

Answer 5

This transfers energy from glucose which enables the plant to convert the rest of the glucose into various other useful substances

Question 6

Why is glucose used in making cellulose

Answer 6

For making strong plant cell walls

Question 7

Why is glucose used in making amino acids

Answer 7

Glucose is combined with nitrate ions (absorbed from the soil) to make amino acids, which are then made into proteins

Question 8

Why is glucose used in stored as oil or fats

Answer 8

Glucose is turned into lipids for storing seeds

Question 9

Why is glucose used in stored as starch

Answer 9

Glucose is turned into starch and stored in roots, stems and leaves for use when photosynthesis isn’t happening, like in the winter

Question 10

Why is starch stored and not glucose

Answer 10

Starch is insoluble which makes it better for storing as a cell with lots of glucose would draw in loads of water and swell up

Question 11

What are the limiting rates of photosynthesis

Answer 11

-Light
-Temperature
-Amount of carbon dioxide
-Amount of chlorophyll in a plant

Question 12

How is light a limiting factor

Answer 12

At night when’s there’s no light it can effect the rate as it provides the energy needed

Question 13

How is temperature a limiting factor

Answer 13

In winter the cold temperatures can effect the rate as if it’s too low the enzymes needed might work more slowly. However if it’s too hot it can denature the enzymes

Question 14

How is the amount of carbon dioxide a limiting factor

Answer 14

Even if you have the right temperature and right amount of light the amount of co2 can still effect the rate.

Question 15

How is the amount of chlorophyll a limiting factor

Answer 15

If a disease, lack of nutrient or stress damage the chloroplasts not as much chlorophyll will be made meaning the rate is reduced as they can’t absorb as much light

Question 16

Describe the practical that shows the rate of photosynthesis