Photosynthesis new Flashcards
What is the function of the chlorophyll found in plant cells?
Absorbs light for photosynthesis.
Name the sugar made in photosynthesis.
Glucose
Name the two chemicals needed for photosynthesis
Water and carbon dioxide
Which two tissues in the leaf contains the most chloroplasts?
Palisade mesophyll
Spongy mesophyll
How does carbon dioxide enter the leaf?
By diffusion
Through the stomata
Give four ways in which the rate of photosynthesis can be increased.
Increase light intensity.
Increase temperature.
Increase concentration of carbon dioxide.
Increase amount of chlorophyll
A plants can convert glucose into protein by adding……
Nitrate
The glucose produced by a plant can be used for :
Respiration - to release energy
Make starch - used to store glucose
Make cellulose - needed to strengthen cell walls
Make fats and oils
Make proteins
Name the chemicals made in photosynthesis
Glucose and oxygen
Name the type of energy needed for photosynthesis
Light
A plant is given excess carbon dioxide and light. The plant does not photosynthesise at its maximum rate. What is the limiting factor? (Higher only)
Temperature.
Give a list of the factors that might limit the rate of photosynthesis
Temperature
Light intensity
Concentration of carbon dioxide
Amount of chlorophyll
Name the green pigment found in chloroplasts.
Chlorophyll.
Name the chemicals shown below
CO2
O2
C6 H12 O6
H2O
CO2 Carbon dioxide
O2 Oxygen
C6 H12 O6 Glucose
H2O Water
Is photosynthesis an exothermic or endothermic reaction?
Endothermic
Energy needs to absorbed for the reaction to occur
Give the word equation for photosynthesis
Carbon dioxide + water –> glucose + oxygen
Explain how temperature affects the rate of photosynthesis.
As temperature increases the rate of photosynthesis increases.
Diffusion of carbon dioxide into the leaf increases
Molecules will move faster and are more likely to collide and react.
Enzymes catalyse these reactions and have an optimum temperature
At very high temperatures the enzymes will denature and photosynthesis will decrease.
Explain how light intensity affects the rate of photosynthesis.
As light intensity increases the rate of photosynthesis increases
Light provides the energy needed for photosynthesis
At very high light intensity not all the light can be absorbed as there is insufficient chlorophyll
Explain how carbon dioxide concentration affects the rate of photosynthesis.
As carbon dioxide concentration increases the rate of photosynthesis increases.
More carbon dioxide can diffuse into the leaf
Increases number of collisions that occur between carbon dioxide and water
Explain how the amount of chlorophyll affects the rate of photosynthesis
As the amount of chlorophyll increases the rate of photosynthesis increases
More light can be absorbed by the chlorophyll
Light is needed to provide the energy for photosynthesis.
Describe and explain how greenhouses are designed to increase the rate of photosynthesis. (Higher)
Large surface area of glass - increase light intensity available to the plant
Temperature monitored - windows opened when too hot. Prevents the denaturation of enzymes
Extra carbon dioxide added - increases amount of carbon dioxide available to the plants.
Plants watered regularly - prevents wilting and provides substrate for reaction
Mineral ions added to the water to provide the nitrate for the plants to make proteins
State the law which describes the relationship between the distance of a light source from a plant and light intensity (Higher)
Inverse square law
Light intensity = 1/distance squared
How can you show that a plant gives of oxygen during photosynthesis?
Using pond weed,
collect gas produced during photosynthesis,
test the gas to make sure it is oxygen (relights a glowing splint)
What is a limiting factor?
An environmental factor which can restrict the rate of photosynthesise
Which letter identifies the sub-cellular structure where photosynthesis takes place?
D
Name the process shown below
Photosynthesis
