Photosynthesis Making Energy Worksheet
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4Name: ______________________________________
Living Environment
Period: ______
Date: ___________
Photosynthesis
Making Energy
Chloroplasts
Photosynthesis is a process in which sunlight energy is used to make glucose. The site
of photosynthesis is in the chloroplast – an organelle found in the leaves of green
plants. The main functions of chloroplasts are to produce food (glucose) during
photosynthesis, and to store food energy. Chloroplasts contain the pigment,
chlorophyll. Chlorophyll absorbs most of the colors in the color spectrum, and
reflects only green and yellow wavelengths of light. This is why we see leaves as
green or yellow – because these colors are reflected into our eyes.
1. What is photosynthesis?
______________________________________________________
_________________________________________________________________________
2. Where does photosynthesis occur? ______________________________________________
3. What are chloroplasts and where are they found? ___________________________________
_________________________________________________________________________
4. What are the two main functions of chloroplasts? ___________________________________
5. Why do most leaves appear green? _____________________________________________
6. What is the primary pigment found in the chloroplast? ________________________________
Photosynthesis
Glucose is another name for sugar. The molecular formula for glucose is C
H
O
. Plants make sugar by using the energy
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from sunlight to transform CO
from the air with water from the ground into glucose. This process, called photosynthesis
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occurs in the chloroplast of the plant cell. During this process, oxygen (O
) is created as a waste product and is released
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into the air for us to breath. The formula for photosynthesis is:
(reactants)
(products)
CO
+ H
O + sunlight ----> C
H
O
+ O
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This formula says that carbon dioxide + water molecules are combined with the energy from sunlight to produce sugar
and oxygen. The reactants in photosynthesis (what is used) are CO
, water and sun. The plant gets water from the
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ground through its roots. The plant collects carbon dioxide from the air. Much of the carbon dioxide comes from living
organisms that exhale (breathe it out) it, but some also comes from factory smokestacks and car fumes.
7. What is the formula for photosynthesis? __________________________________________
8. What three things are used to make glucose in photosynthesis? _________________________
_________________________________________________________________________
9. Where does the water come from? ______________________________________________
10. Where does the water enter the plant? ___________________________________________
11. Name 3 sources of CO
. _________________________________________________
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12. What type of energy does the plant use to convert CO
and H
O into sugar? ________________
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The products are glucose and oxygen. The glucose produced is used by the plant for energy and growth. We also use
this glucose by eating plants. The oxygen produced is released into the air for us to breathe. Photosynthesis is essential
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