B8

Question 1

What does improving growing conditions do?

Answer 1

Maximises rate of diffusion

Question 2

Rp- investigating the effect of ___ on rate of photosynthesis using pondweed

Answer 2

Light intensity

Question 3

What’s the hypothesis for rp6?

Answer 3

Changing light intensity will effect rate of photosynthesis because light is required for photosynthesis

Question 4

What’s the conclusion for rp6?

Answer 4

As light intensity increases, rate of photosynthesis increases up to a point where another factor may be limiting

Question 5

What law does rp6 follow?

Answer 5

The inverse square law- light intensity is proportional to 1/distance^2

Question 6

Leaf adaptions (7)

Answer 6

-large surface area to absorb light
- thin structure to minimise distance for diffusion
- chlorophyll to absorb light
- veins to supply water to the leaf via the xylem
- veins to remove glucose via the phloem
- air spaces to allow CO2 to get into the cells and oxygen to leave by diffusion
- guard cells to open and close stomata to regulate gas exchange and water loss

Question 7

Factors which effect rate of diffusion: (4)

Answer 7

• light intensity: this provides the energy for photosynthesis to begin
• temperature: due to its effect on the enzymes involved in photosynthesis
• CO2 concentration: this is a reactant for photosynthesis
• amount of chlorophyll- absorbs light energy to begin conversion of CO2 and H2O into glucose

Question 8

Glucose produced in photosynthesis may be… (5)

Answer 8

• used in respiration
• converted into insoluble starch for storage
• used to produce fat/oil for storage
• used to produce cellulose which strengthens the cell wall
• used to produce amino acids for protein synthesis

Question 9

How can we test for glucose

Answer 9

Benedicts test- heat the sample (!) Blue- brick red

Question 10

Understanding __ helps maximise the production of plants

Answer 10

Limiting factors

Question 11

Is photosynthesis exothermic or endothermic

Answer 11

Endothermic

Question 12

During photosynthesis, energy is transferred from ____ to the ____ by ____

Answer 12

• environment, chloroplasts, light

Question 13

How do you test for starch?

Answer 13

Iodine test- orange/brown to black

Question 14

During photosynthesis, the energy converts ___ from the air and water from ____ into ____ and _____

Answer 14

Carbon dioxide, the soil, glucose, oxygen