4.1 Photosynthesis

Question 1

_____ absorbs the energy required for photosynthesis?

Answer 1

chlorophyll

Question 2

In what part of the cell does photosynthesis take place?

Answer 2

chloroplasts

Question 3

What is the word equation for photosynthesis?

Answer 3

carbon dioxide + water —> glucose + oxygen

Question 4

What is the balanced chemical symbol equation for photosynthesis?

Answer 4

6CO2 + 6H2O ➔ C6H12O6 + 6O2

Question 5

Which type of reaction is photosynthesis?

justify your answer

Answer 5

Endothermic

Photosynthesis is an endothermic process because it requires energy (from the sun).

Question 6

What can the glucose made during photosynthesis be used for?

(2 answers)

Answer 6

Respiration

Stored as starch for later

Question 7

How do plants get the carbon dioxide required for photosynthesis?

Answer 7

It diffuses from the air into the leaves via stomata

Question 8

How do plants get the water required for photosynthesis?

Answer 8

diffuses from the soil into the root hair cells by osmosis

Question 9

What makes starch a useful long term storage molecule?

(3 answers)

Answer 9

It can easily be broken down when needed

It is insoluble in water

It is compact

Question 10

One use of glucose is to make amino acids.

What else do plants need to make amino acids?

Answer 10

Nitrate ions

Question 11

What are the main uses of glucose in plants?

(5 answers)

Answer 11

Cellular respiration - break down the glucose to release energy

Make cellulose - which is used to make strong cell walls

Make starch - which is used to store glucose for a later time

Make amino acids - which are used to make proteins

Make lipids - these store the energy as fats or oils for later use