PP EX 2

Only 1-4% of the energy is captured by leaf for

Photosynthesis, which is still enough to sustain life on earth

Energy from light drives what type of reaction

endergonic reaction (meaning require energy)

Why is photosynthesis important

oxygen supply

food production

energy source

climate regulation

Majority of photosynthesis occurs internally in leaves, in the

mesophyll cells

What is the thylakoid membrane

contains pigment molecules

What is a granum

stack of thylakoids

What is the fluid-filled region between the thylakoid membrane and the inner membrane

stroma

What is chlorophyll a

main pigment which absorbs light mainly in the blue and red wavelengths

What is chlorophyll b

accessory pigment which absorbs light in blue, red, and orange wavelengths

What is carotenoids

accessory pigment which absorbs light in blue/ violet spectrum, and protects from harmful byproducts

What is the reason for autumn leaf colors

decreasing temp in autumn causes a decrease in the levels of chlorophyll

What is action spectrum

rate of photosynthesis by whole plant at specific wavelengths

What is the green window

less efficiently absorbed something

What are the 2 steps of photosynthesis

Light-dependent and light independent reactions

What is a light dependent reaction

starting materials: light + water

occurs in grana

produce ATP and NADPH

release O2 as a by product

What is a light independent reaction (calvin cycle)

starting materials: CO2, ATP, NADPH

do not need light to occur and result in the formation of organic molecules

occurs in stroma