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chapter 7 nature of sunlight
31
Biology
Graduate
02/28/2011

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Term
chloroplasts are
Definition
chemical factories powered by the sun
Term
sunlight is a type of energy called
Definition
radiation, or electromagnetic energy
Term
Chloroplasts are:
Definition
The site of photosynthesis
Found mostly in the interior cells of leaves
Term
Inside chloroplasts are membranous sacs called ________, which are suspended in a thick fluid, called ________ .
Definition
thylakoids, stroma
Term
Thylakoids are concentrated in stacks called_________ .
Definition
grana
Term
The green color of chloroplasts is from ________, a light-absorbing pigment.
Definition
chlorophyll
Term
Stomata are:
Definition
tiny pores in leaves where carbon dioxide enters and oxygen exits
Term
In photosynthesis:
Definition
Sunlight provides the energy
Electrons are boosted “uphill” and added to carbon dioxide
Sugar is produced
Term
During photosynthesis, water is split into:
Definition
Hydrogen
Oxygen
Term
___________is transferred along with _______ and added to__________ to produce sugar.
Definition
Hydrogen, electrons, carbon dioxide
Term
Oxygen escapes through _________ into the atmosphere.
Definition
stomata
Term
Photosynthesis occurs in two stages:
Definition
light reaction, and the calivn cycle
Term
The light reactions:
Definition
convert solar energy to chemical energy
Term
The Calvin cycle:
Definition
uses the products of the light reactions to make sugar from carbon dioxide
Term
Chloroplasts:
Definition
Convert solar energy into chemical energy
Term
The full range of radiation is called
Definition
the electromagnetic spectrum
Term
Chloroplasts contain several pigments:
Definition
Chlorophyll a: Chlorophyll b:
Term
Chlorophyll a:
Definition
Absorbs mostly blue-violet and red light
Participates directly in the light reactions
Term
Chlorophyll b:
Definition
Absorbs mostly blue and orange light
Participates indirectly in the light reactions
Term
Carotenoids:
Definition
Absorb mainly blue-green light
Participate indirectly in the light reactions
Absorb and dissipate excessive light energy that might damage chlorophyll
Term
The colors of fall foliage are due partly to the yellow-orange light reflected from
Definition
carotenoids.
Term
Chlorophyll molecules absorb photons of ________
______in the pigment gain energy.
As the electrons fall back to their ground state, energy is released as _______.
Definition
light energy, electrons, heat or light
Term
A photosystem:
Definition
is a group of chlorophyll and other molecules that function as a light-gathering antenna.
Term
Two types of photosystems cooperate in the light reactions:
Definition
The water-splitting photosystem
The NADPH-producing photosystem
Term
The light reactions are located in the
Definition
thylakoid membrane.
Term
An electron transport chain:
Definition
Connects the two photosystems
Releases energy that the chloroplast uses to make ATP
Term
The Calvin cycle:
Definition
Functions like a sugar factory within the stroma of a chloroplast
Regenerates the starting material with each turn
Term
C3 plants:
Definition
Use CO2 directly from the air
Are very common and widely distributed
Term
C4 plants:
Definition
Close their stomata to save water during hot and dry weather
Can still carry out photosynthesis
Term
CAM plants:
Definition
Are adapted to very dry climates
Open their stomata only at night to conserve water
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