B1.4.1 - Photosynthesis

Question 1

What is photosynthesis?

Answer 1

Process used by plants to make their own food

Question 2

What kind of reaction is photosynthesis?

Answer 2

An endothermic reaction, meaning it takes IN energy from surroundings

Question 3

What is the food source and the waste product produced?

Answer 3

Food source - Glucose
Waste product - Oxygen

Question 4

How does carbon dioxide enter the plant?

Answer 4

Diffuses from air in the plant through the stomata (guard cells)

Question 5

How does water enter the plant?

Answer 5

Enters roots from soil through root hair cells by osmosis

Question 6

Where does photosynthesis occur?

Answer 6

In the chloroplasts

Question 7

What are the 2 main stages

Answer 7

One is light dependant
The second is light independent

Question 8

Describe the light dependant stage

Answer 8

Energy transferred from light splits water molecules into oxygen gas and hydrogen ions

Question 9

Describe the light independent stage

Answer 9

Carbon dioxide gas combines with hydrogen ions to make glucose

Question 10

What happens to the glucose produced? State 3.

Answer 10

1) Some used immediately for respirations
2) Others converted to sugar molecules (fructose, surcrose, etc)
3) Converted to starch for respiring at night
4) Make cellulose (forms cell wall), proteins (growth and repair), fat and oils