Photosynthesis and limiting factors

Question 1

What is photosynthesis?

Answer 1

A process whereby green plants use energy from sunlight in the presence of carbon dioxide water and chlorophyll to make glucose.(i.e. green plants make their own food)

Question 2

What is the word equation for photosynthesis?

Answer 2

Carbon Dioxide + Water —————————————-> glucose + oxygen
SUNLIGHT and chlorophyll

Question 3

What is the balanced symbol equation for photosynthesis?

Answer 3

6CO2 + 6H20 —————————————-> C6H12O6 + 6O2
SUNLIGHT and chlorophyll

Question 4

Where is chlorophyll found in plant?

Answer 4

In the leaf specifically the chloroplasts

Question 5

Use of xylem?

Answer 5

The xylem. transports water and minerals from the roots up the plant stem and into the leaves.

Question 6

Use of phloem?

Answer 6

The phloem. moves food substances that the plant has produced by photosynthesis

Question 7

How is water absorbed by the roots?

Answer 7

OSMOSIS

Question 8

What are the uses of glucose?

Answer 8

1) Respiration for energy
2) Fruit sugars
3) Plant fat/oil
4) Starch and stored in root/stem
5) Cellulose(cell walls)
6) Protein for growth and repair(+ mineral ions from soils)

Question 9

Word equation for respiration?

Answer 9

GLUCOSE + OXYGEN ———–> CARBON DIOXIDE + WATER ( + ENERGY)

Question 10

Symbol equation for respiration?

Answer 10

C6H12O6 + 6O2 ————-> 6CO2 + 6H20 ( + ENERGY)

Question 11

What factors are needed for photosynthesis to take place in plants?

Answer 11

1) Daylight
2) Green plants

Question 12

What do plants do at night?

Answer 12

Respire to release energy (Respiration)

Question 13

Is photosynthesis an exothermic or endothermic reaction?

Answer 13

endothermic reaction

Question 14

Do animals respire or photosynthesise and in what conditions?

Answer 14

Animals only respire and they can do this in daylight and night.

Question 15

What is a limiting factor of photosynthesis?

Answer 15

Limiting factors are those that limit the rate of photosynthesis and stop photosynthesis occurring any faster.

Question 16

How would you increase the rate of photosynthesis using limiting factors?

Answer 16

They would have to increase. (i.e. more light , temperature , CO2)

Question 17

What are the limiting factors for photosynthesis?

Answer 17

1) LIGHT INTENSISTY
The more light a plant gets the faster is the rate of photosynthesis. At night light is a limiting factor
2) CARBON DIOXIDE CONCENTRATION
The more co2 the faster the rate of photosynthesis
3) TEMPERATURE
The higher the temperature is the faster is the rate of photosynthesis ( ENZYMES work faster in higher temperatures)

Question 18

What is a method for a practical on photosynthesis and limiting factors?

Answer 18

1) Place the table lamp a certain distance from the plant.Count the number of bubbles in a given time.
2) Change the distance then again count the bubbles in a given time
3) Repeat for several values of distance (d)

Question 19

What does the inverse square law link?

Answer 19

It links light intensity with distance.

Question 20

Equation for light intensity?

Answer 20

d^2

Question 21

Benefits of a green house?

Answer 21

1) Glass traps heat which makes the temperature higher
2) Artificial lights which makes it a high light intensity
3) You can burn fossil fuels which releases co2

Question 22

What happens if we increase the temperature past a certain point?

Answer 22

The enzymes will denature and the rate of photosynthesis will decrease.