B8.1 And 8.3

Question 1

What is the word equation for photosynthesis ?

Answer 1

Carbon dioxide+ water—- Oxygen +glucose

Question 2

What is the balanced symbol equation for photosynthesis ?

Answer 2

6CO2 + 6H2O — 6O2 + C6H12O6

Question 3

What type of reaction is photosynthesis ? What does this mean?

Answer 3

Endothermic !
It takes in energy (light) form it’s surroundings

Question 4

How is the leaf adapted for photosynthesis ? List 3 points

Answer 4

Broad leaves- light absorption
Thin leaves- gas diffusion distances
Chloroplast containing chlorophyll- light absorption+ more photosynthesis

Question 5

When testing a leaf for attach why would you boil the leaf?

Answer 5

Stops further photosynthesis by killing the leaf

Question 6

Why boil the leaf in ethanol ?

Answer 6

Removes chlorophyll
Makes the colour change easier to see

Question 7

What does a blue/ black result tell us ?

Answer 7

Leaf contains starch so photosynthesis has occurred in the leaf

Question 8

What safety pre cousin is needed when using ethanol?

Answer 8

Flammable to be careful around a Bunsen burner

Question 9

What result would you expect to see from a leaf kept in the dark for three days?

Answer 9

Orange— no light so it cannot photosynthesis so no starch and glucose are produced

Question 10

Why does the leaf store glucose as starch?

Answer 10

Starch is insoluble so doesn’t affect the water moving in and out of cells
Therefore it does not interfere with osmosis

Question 11

What are three uses or glucose in the plant ?

Answer 11

Respiration to release energy for chemical reactions

Producing fats or oils for storage

Producing I double strand in leaves and storage organs