Download Unit 1 Lesson 6 Photosynthesis and Cellular Respiration

Unit 1 Lesson 6 Photosynthesis and Cellular
Respiration
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
Energize!
How do the cells in an organism
function?
• Cells must capture and use energy or they will
die.
• Without energy, living things cannot replace cells,
build body parts, or reproduce.
• Food contains chemical energy that cells need to
carry out life processes.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do the cells in an organism
function?
• Producers make their own food. Most use energy
from the sun. Some use chemicals to make food.
• Consumers must eat other living things to get
food. They may eat producers or other
consumers.
• Decomposers get energy by breaking down dead
organisms or wastes of other organisms.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
Cooking with Chloroplasts
How do plant cells make food?
• Photosynthesis is a process by which plants use
energy from sunlight, carbon dioxide, and water
to make sugars.
• Oxygen is released into the air during
photosynthesis.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do plant cells make food?
• Photosynthesis takes place in organelles called
chloroplasts.
• A green pigment called chlorophyll in
chloroplasts captures energy from sunlight.
• This energy is used to combine carbon dioxide and
water to form the sugar glucose and oxygen gas.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do plant cells make food?
• 6CO2 + 6H2O + light energy → C6H12O6 + 6O2
• Plants store glucose, which is a sugar that stores
chemical energy.
• When organisms eat plants, they use the stored
sugars for energy.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do plant cells make food?
• What occurs in the organelle shown below?
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
Mighty Mitochondria
How do cells get energy from food?
• Energy in sugars is stored in a molecule called
adenosine triphosphate (ATP).
• Cellular respiration is the process of breaking
down food to produce ATP.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do cells get energy from food?
• Cellular respiration takes place in the cytoplasm
and cell membranes of prokaryotic cells.
• In eukaryotes, cellular respiration takes place in
organelles called mitochondria.
• Glucose is first broken down into two 3-carbon
molecules in the cytoplasm, releasing energy.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do cells get energy from food?
• Oxygen enters the cell and travels to the
mitochondria.
• The 3-carbon molecules are broken down in the
mitochondria, where energy is captured and
stored as ATP.
• The products of cellular respiration are chemical
energy (ATP), carbon dioxide, and water.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do cells get energy from food?
• In many animals, carbon dioxide is carried to the
lungs to be released during breathing.
• Some of the energy produced during cellular
respiration is released as heat.
• Much of the energy produced is transferred to ATP.
• C6H12O6 + 6O2 → 6CO2 + 6H2O + chemical energy
(ATP)
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
How do cells get energy from food?
• What is the role of mitochondria during cellular
respiration?
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
Merry-Go-Round!
How are photosynthesis and cellular
respiration connected?
• Plants need carbon dioxide for photosynthesis,
and they release oxygen.
• During cellular respiration, other organisms use
this oxygen and release carbon dioxide.
• Photosynthesis and respiration are linked, each
depending on the products of the other.
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Unit 1 Lesson 6 Photosynthesis and Cellular Respiration
Out of Air
• Anaerobic respiration, which is respiration without
oxygen, can occur if there is not enough oxygen.
• Fermentation is a form of anaerobic respiration
used by yeasts.
• The body uses anaerobic respiration during hard
exercise. The lactic acid produced makes muscles
sore.
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