B8 PHOTOSYNTHESIS

Question 1

What is photosynthesis

Answer 1

The process of making soluble foods from carbon dioxide and water

Question 2

How do plants get energy needed for photosynthesis and what type of light is it

Answer 2

The sun provides light energy

Question 3

Where do plants absorb the light energy

Answer 3

Green chlorophyll in the chloroplasts

Question 4

Word equation for photosynthesis

Answer 4

Carbon dioxide + water —–> glucose + oxygen
(—–> = light energy)

Question 5

Symbol Equation for photosynthesis

Answer 5

6CO2+6H2O→C6H12O6+6O2
—>= lignt energy

Question 6

4 leaf adaptations for photosynthesis

Answer 6

They are broad giving large surface for light to fall on

They are thin Thin so diffusion distances for the gases are short

Contain chlrorphyll in the chloroplasts to asborb light

Have guard cells that open and cloze the stomata to regulate gas exchange

Question 7

Uppee bit of leaf to lower(diagram)
Wax….
Upper…..
Palisade….
Spongy…..
Air….
Stoma
Lower….
Guard cell with…
Wax….

Answer 7

Wax cuticle
Upper epidermis
Palisade mesophyll
Spongy mesophyll
Air spacestoma
Lower epidermis
Guard cell with chloroplasts
Wax cuticle

Question 8

Are plants or animals consumers or producers

Answer 8

Plants and algae are producers
Animals are consumers

Question 9

Uses of glucose in:
Respiration
Stored as starch
Stored as suc…(in fruit)
Converts nutrients into…
Produces cellulose.. for the cell wall
Makes.. (for storage)

Answer 9

Immediately used to provide energy for respiration
Stored as starch to be insoluble storage
Stored as sucrose(in fruits)
Converts sugars,nitrates.nutrients to amino acids which build up protein and
Produces cellulose for the cell wall
Fats and oils

Question 10

What happens to glucose during photosynthesis

Answer 10

Glucose is produces as a simple sugar,but plants can’t store it so convert it into starch and starch is insoluble so can be stored easily

Question 11

4 factors that affect how quickly photosynthesis can occur:

Answer 11

Light
Temprature
Carbon dioxide concentration
Chlorophyll levels in leaf

Question 12

How does light affect photosynthesis

Answer 12

As light increases rate the rate photosynthesis increases until another factor limits it

Question 13

How does carbon dioxide concentrations affect photosynthesis

Answer 13

As the Carbon Dioxide increases, photosynthesis rate increases. Until another factor limits it.

Question 14

How does temprature affect photosynthesis

Answer 14

As the temperature increases, photosynthesis
rate increases. Until it gets too hot and enzymes are denatured.

Question 15

How do chlorophyll levels affect photosynthesis

Answer 15

If the amount of chlorophyll in a leaf is limited, less photosynthesis will take place.

Question 16

What is the inverse square law and the formula

Answer 16

As the distance of the light increases, the intensity decreases. This is not linear
Light intensity α=1/distance^2

Question 17

Best factors for plant growth

Answer 17

Warm enviroment
Light
Water
Carbon dioxide
Correct minerals

Question 18

What are polytunnels and greenhouses

Answer 18

Used to grow crops ranging for strawberries to poatoes,allow plants to flower and fruit earlier so their’s a higher yield. Allows some fruits like peaches to be grown in the uk

Question 19

What are hyrdoponics

Answer 19

Structure whicb allows plants to be grown quicker in water with the perfect balance of mineral ions.computers are used to control this enviroment which is very expenixve.however the crops are clean and unspoilt and no ploughing of fields.

Question 20

The affect of light on the rate of photosynthesis required practical

Answer 20

1.=Cut a piece of pondweed 8-10 cm long. Then Place it in a boiling tube of water/bicarbonate with the cut end upwards.
2=Use the thermometer to measure the temperature of the water in the boiling tube.
3=Place the boiling tube in a large beaker of water to act as a heat shield and position it 10cm away from the lamp.
4=Wait until there is a steady flow of bubbles from the cut end of the pondweed. Count the number of bubbles in 2 minutes
5=Measure the temperature of the water in the boiling tube again to make sure it has not changed.
6=Repeat steps 1-5 four more times but increase the distance between the lamp and boiling tube by 10 cm each time.
7=Repeat the whole investigation two more times.
8=Calculate the mean number of bubbles for each distance, leaving out any anomalous values from your calculations.