Photosynthesis Answer Key
1.
Photosynthesis is
a. the green material in plants that traps energy from sunlight and uses it to break down water
molecules into atoms of hydrogen and oxygen.
b. the growth tissue that produces the xylem and phloem.
c. the process by which green plants use chemicals from the environment and energy from
the Sun to make their own food.
2.
Photosynthesis is an instance of
a. homeostasis.
b. reproduction.
c. metabolism.
d. growth and development.
e. cell structure.
3.
The first step in photosynthesis is the
a. absorption of light energy.
b. synthesis of water.
c. production of oxygen.
d. formation of ATP.
4.
In a typical plant, which factor is NOT necessary for photosynthesis?
a. chlorophyll
b. light
c. oxygen
d. carbon dioxide
5.
In photosynthesis, water undergoes
, while carbon dioxide undergoes
.
a. oxidation; reduction
b. reduction; oxidation
c. no change; oxidation
d. none of the above
6.
Oxygen made during photosynthesis results from the
a. absorption of light.
b. splitting of water molecules.
c. mitochondrial membranes.
d. splitting of carbon dioxide molecules.
7.
Many plants are excellent at photosynthesis because they
a. have few mesophyll cells in their leaves.
b. are equipped with many leaves that have many mesophyll cells, which in turn have many
chloroplasts.
c. are able to transform light energy into heat energy for cellular work.
d. can carry out photosynthesis in their roots, stems, flowers as well as their leaves.
e. produce an abundant supply of oxygen that is an important input for photosynthesis.
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8.
What is the equation for photosynthesis?
sunlight+CO2+H2O---> glucose+O2+energy
9.
Many people say that people depend on plants as much as plants depend on people. Using your knowledge
of cellular respiration and photosynthesis, explain why this statement is true.
In order for photosynthesis to occur, plants need sunlight, carbon dioxide, and water.
When plants use the carbon dioxide that is readily available to them in the environment to
undergo photosynthesis, one of their byproducts is releasing oxygen gas back into the
atmosphere. Humans need oxygen gas into order to breathe (cellular respiration). After
cellular respiration has occurred in humans, they release carbon dioxide back into the
atmosphere. Thus these two processes are related in that they are practically the opposite
of each other
10. Draw a picture of a chloroplast. Be sure to label the parts that are significant to photosynthesis and give
me a brief explanation of each part.
Stroma- the space outside the thylakoid membrane
Granum- a stack of thylakoids
Thylakoids- sac like structures that are made of protein and the pigment chlorophyll
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