Photosynthesis

Question 1

Define Photosynthesis

Answer 1

Way in which plants produce glucose and oxygen from Co2 and H2O

Question 2

Chemical Formula for Photosynthesis

Answer 2

Chlorophyll
6CO2 + 6H2O —————–> C6H12O6 + 6O2
Light

Question 3

Role of Photosynthesis

Answer 3

To make food and produce oxygen

Question 4

Why is the dark stage necessary for the continuation of the light stage

Answer 4

Products of dark stage used in light stage

Question 5

Role of stomata in photosynthesis

Answer 5

Gas exchange

Question 6

Role of chlorophyll in photosynthesis

Answer 6

Absorb light

Question 7

Name 3 products of the light dependent stage

Answer 7

ATP
Oxygen
NADPH

Question 8

What does Atp stand for

Answer 8

Adenosine Triphosphate

Question 9

Where in the cell does the dark stage take place

Answer 9

Chloroplast

Question 10

Name 3 products of the light Independent Stage

Answer 10

Plant respiration
NADP+
Glucose

Question 11

Why is it an advantage that chlorophyll contains a number of chemicals

Answer 11

So it absorbs more light

Question 12

Outline the events of stage 3 (dark stage)

Answer 12

Energy from ATP
NADPH from electrons 
NADPH from protons 
CO2 combines with electrons 
CO2 combines with protons 
Forms Glucose

Question 13

Describe 2 ways to improve plant production in a greenhouse

Answer 13

Keep to optimum pH

Keep to optimum temperature

Question 14

What particles are released from chlorophyll during the light dependent stage

Answer 14

Electrons

Question 15

Give an account of the events of pathway 2

Answer 15

Electrons trapped by NADP and form NADP-
H+ attracted to NADP- and forms NADPH
Water splits into proton (H+) and electrons (e-)
O2 is formed 
Electrons pass to chlorophyll
ATP is formed

Question 16

Involving an experiment showing photosynthesis what plant is used

Answer 16

Elodea

Question 17

Why is elodea used

Answer 17

As its an aquatic plant and produces bubbles easily

Question 18

How is the rate of photosynthesis measured

Answer 18

The amount of bubbles per unit of time

Question 19

What labels are on the axis of the graphs

Answer 19

X-axis: Light intensity

Y-axis: Number of bubbles

Question 20

Explain how temperature increase and increase CO2 concentration increases photosynthesis

Answer 20

Temperature: Increases enzyme activity

CO2: Increases supply of atoms to dark stage

Question 21

Outline the events of pathway 1

Answer 21

Light energising electrons
Electrons from chlorophyll forms ATP
Electrons returned to chlorophyll

Question 22

Name 2 sources of CO2 in the atmosphere

Answer 22

Respiration
and
combustion

Question 23

Name a gas essential for the dark stage

Answer 23

Carbon Dioxide

Question 24

Name and explain why 2 products of the light stage are essential for the dark stage

Answer 24

NADPH: Supplies Hydrogen

ATP: Supplies energy

Question 25

Draw a diagram of Pathway 1

Answer 25

Question 26

Draw a diagram of pathway 2

Answer 26

Question 27

Draw a diagram of pathway 3

Answer 27

Question 28

Draw a diagram of chloroplast

Answer 28

Question 29

Draw a diagram of the structure of a leaf

Answer 29

Question 30

State the role of Co2 and water in photosynthesis

Answer 30

Co2: supplies carbon

Water: supplies hydrogen