Download CN Photosynthesis EDITS QUESTIONS.docx

Photosynthesis p. 118-122
#61
Questions and Vocab
EQ: What happens during the process of
photosynthesis?
5 study questions
 All living things need energy to live
Ex: Zebra eats grass to provide energy to its cells, so
the cells may carry out their functions
 Plants, algae, some fungi, and some bacteria get
their energy from sunlight to make their own food
photosynthesis
Sources of Energy
: the process by which a cell captures energy in sunlight
and uses it to make food
Greek words photo = “light” synthesis = “put together”
 Nearly all living things obtain energy either directly
or indirectly from the energy of sunlight captured in
photosynthesis.
How does the sun
supply living things
with the energy they
need?
Autotroph
Heterotroph
: an organism that makes its own food
Ex: grass
: and organism that can’t make its own food and has to
eat other organisms to obtain energy
Ex: zebra and lion
Photosynthesis p. 118-122
#61
The Two Stages of Photosynthesis
 During photosynthesis, plants and some other
organisms use energy from the sun to convert carbon
dioxide and water into oxygen and sugars.
 There are two stages of photosynthesis: capturing
the sun’s light and making sugar
3. What happens during
stage 1 of
photosynthesis?
Pigments
Chlorophyll
4. What happens during
stage 2 of
photosynthesis?
2. What are the raw
materials for
photosynthesis?
5. What is the importance
of stomata during the
photosynthesis process?
Stomata (stoma)
Stage 1: Capturing the Sun’s Energy
 Plant leaves capture sunlight by using green
pigments (chlorophyll) to absorb the sun’s energy
: colored chemical compounds that absorb light
: the main photosynthetic pigment stored in
chloroplasts
 The plant uses this energy from the sun to power the
second stage of photosynthesis
Stage 2: Using Energy to Make Food
 In the next stage, the captured energy is used to
make sugar (glucose)
 Water (H2O) and Carbon Dioxide (CO2) are the two
ingredients needed to make sugar (glucose)
 Water comes from the soil. It is absorbed from the
plants roots and transferred up through the stem
into the leaves.
 Carbon Dioxide comes from the air. It is a gas that
enters into the leaves through stomata.
: small openings found on the underside of leaves
 Once in the leaves, water and carbon dioxide move
into the chloroplasts
Photosynthesis p. 118-122
2. What are the
products of
photosynthesis?
#61
 Water and carbon dioxide undergo a series of
chemical reactions. The chemical reactions need the
energy of the sun to power them.
 The reactions makes two new products: glucose
(sugar) and oxygen gas
 The sugar made from the process of photosynthesis
contains the energy the plant can use to carry out its
functions.
 Oxygen gas is a waste product and gets released
through the stomata out into the air
The Photosynthesis Equation
 The events of photosynthesis can be summed up by
the following chemical equation
 It takes 6 carbon dioxide molecules and 6 water
molecules to “yield” one sugar (glucose) molecule
and 6 oxygen molecules. Light energy is needed for
the reaction to occur.
 Plants use sugar (glucose) molecules in the following
ways:
o Break down the sugar molecules for energy
(food source)
o Build larger molecules (cellulose) to make
structures for the plant
o Store the sugar for future use
Summary: 5-8 sentence
paragraph
Photosynthesis p. 118-122
#61