Name:______________________________________
Photosynthesis
YOU MAY USE YOUR BOOKS TO ANSWER THESE QUESTIONS
Sources of Energy
Key Concept: Nearly all living things obtain energy either directly or indirectly from the energy of
sunlight captured during photosynthesis.
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__________________________ is what happens when cells take in the energy in sunlight and
use it to make food.
______________ make their own food by photosynthesis. __________________ get energy
directly form sunlight.
Animals cannot make their own food. Animals get food by eating plants or by eating other
animals that eat plants or by eating other animals that eat plants. So, animals get the sun’s
energy ______________________.
Answer the following questions. Use your textbook and the ideas above.
1. Circle the letter of what happens in photosynthesis.
a. Animals get food
b. Plants make food using the sun’s energy
c. The sun shines on plants.
The Two Stages of Photosynthesis
Key Concept: During Photosynthesis, plants and some other organisms use energy from the sun to
convert carbon dioxide and water into oxygen and sugars.
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In the first stage, or part, of photosynthesis, plants take in the energy in sunlight. Remember,
plant cells have special organelles called __________________. A chemical in
________________ absorbs energy in sunlight.
In the second stage of ___________________, plant cells use the captured energy to make food.
To do this, plant cells need water and ________________.
Plants get ________________ water by absorbing it from the soil with their roots. Carbon
dioxide gas enters the leaves through small openings on the leaves called
___________________.
Inside the chloroplasts, __________ and _____________________ go through a series of
chemical reactions. The energy captured from the sun powers these reactions.
One product of these chemical reactions is _____________. Plant cells use the energy from
some of this _______________ is changed to carbohydrates that make up plant structures.
The other product of photosynthesis is _____________________. _________________ goes
out of the leaf through the same small openings that carbon dioxide entered the leaf.
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Name:______________________________________
Fill in the concept map below about photosynthesis.
Photosynthesis
Raw materials are
Products are
Carbon dioxide
Oxygen
___________________________ a process by which plants convert sunlight, water and carbon dioxide
into sugar, oxygen and water.
____________________________is an elongated cell organelle containing chlorophyll where
photosynthesis takes place.
Define photosynthesis.
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Name:______________________________________
What is Photosynthesis?
Why is photosynthesis important?
What is the formula for photosynthesis?
To make food plants need __________________________.
Chlorophyll resides inside _________________________.
What are autotrophs and why are they important?
Plants have the ability to make their own food, they are called __________.
a. Autotrophs
b. Heterotrophs
c. Vegetarians
d. Autosomes
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Name:______________________________________
Which of the following is a product of Photosynthesis?
a. CO2
b. O2
c. Sucrose
d. C6H11O6
Which of the following is a raw material needed for the process of Photosynthesis?
a. sunlight
b. O2
c. Glucose
d. CO2
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Name:______________________________________
Word
Definition
Example
Photosynthesis
Autotroph
(Producer)
Chloroplast
Stroma
Chlorophyll
Pigment
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