B1.4 Photosynthesis Flashcards
What is photosynthesis?
The process by which producers make food. C02 and water react to form glucose + oxygen
What is the balanced symbol equation for photosynthesis?
6C02 + 6H20 —> C6H1206 + 602
Where does photosynthesis occur?
Mainly in the leaves and also in the green stem - inside the chloroplasts
Why are leaves and stems green?
Because inside the chloroplasts is a pigment called chlorophyll
Light transfers energy from the ___ to chlorophyll. Here ___ and ___ react to make ____ (a chemical form of energy) and oxygen
Sun
C02
H20
Glucose
The palisade layer has a _____ shape and is the site of ______. There are lots of _____ to maximise light absorption
Columnar
Photosynthesis
Chloroplasts
The spongy ____ layer allows reactants to ____ and move through the leaf
Mesophyll
Diffuse
The ____ cells control the opening and closing of the _____
Guard
Stomata
Stomata open to let what in?
C02
What does the waxy cuticle do?
Seals leaf
Prevents moisture loss
Protects against bacteria
What do plants need glucose for?
Used straight away in respiration
Some converted into starch for storage
Some used to make new chemicals
What chemicals is glucose used to make?
Protein for cell growth
Fats and oils for energy
Cellulose which strengthens the cell wall
Why do plants need to convert glucose into starch and cellulose?
Starch is insoluble —> good for storage
Cellulose is insoluble and strong —> uses for cell walls
Light intensity = 1/ ?
d squared
When calculating light intensity, what does d mean?
Distance
Calculating light intensity example:
A lamp is placed 10cm away from plant. 1/d squared = ?
1/100 = 0.01
What is a limiting factor?
Something present in the environment in such short supply that it restricts the rate of photosynthesis
The higher the ___ intensity, the ____ the rate of photosynthesis
Light
Faster
C02 is one of the ____ for photosynthesis. The greater the C02 concentration, the ____ the rate of reaction
Reactants
Faster
