Photosynthesis Flashcards
(12 cards)
what type of cells does photosynthesis carry out?
Photosynthesis occurs within the cholorophlast locates mostly in mesophyll cells
What is the purpose of photosynthesis
Photosynthesis is the process by which the energy of
sunlight is converted into the energy of glucose.
This is carried out by plants and other autotrophs.
When does photosynthesis occur?
Throughout the day
worded equation of photosynthesis
carbon dioxide + water - glucose + oxygen
structure of chloroplast
Outer and inner membrane Liquid filling inside is called the STROMA.
Inner membrane has stacks called GRANA which are filled with chlorophyll – the green light absorbing pigment.
2 stages of photosynthesis
Light dependant reaction
Light independant reaction
( calvin cycle )
the role of the stomata
They are the sites for gaseous
exchange for the plant.
The stoma is the opening which is
surrounded by TWO GUARD cells.
Whilst the stomata are open, water
evaporates and is lost to the
atmosphere.
Light dependant reaction
- h20 enters
- Occurs in the grana
- Light is absorbed by the green
pigment chlorophyll in the grana. - chlorphyll excites and splits H+ ions
- O2 is released
Light independant reaction ( Calvin cycle )
- occurs in the stroma of the chloroplast
- energy is transferred from ATP and NADPH to make carbon dioxide to make glucose
factors that affect the rate of photosynthesis
Temperature
Carbon dioxide concentration
Light intensity
Water availability
temp
The stages of photosynthesis are catalysed by enzymes
The temperature that is OPTIMUM for the functioning of the
went it continues increasing enzyme bonds are broken causing a recess.
Linking photosynthesis and respiration
Cells require a constant source of energy for life processes
but keep only a small amount of ATP on hand. Cells can
regenerate ATP as needed by using the energy stored in
foods like glucose.
