Name__________________________________________ Date_________ Block__________
Photosynthesis/ Respiration Study Guide 2015 Answer Key
Photosynthesis Fill in the blanks using words. There is a word bank, but the word bank will only accept deposits today, it will issue no words.
1.
Photosynthesis is a process that uses this pigment/chemical called chlorophyll_ which the plant uses to look green.
2.
Unlike Photosynthesis, the process of _ cellular respiration PRODUCES energy in the form of ATP.
3.
Photosynthesis produces _ oxygen_, an important gas that humans breathe.
4.
Another product of photosynthesis is glucose , which is an important form of food.
5.
Plants use energy of visible light from the Sun to power the process of photosynthesis and make the reactants turn into products.
6.
Photosynthesis happens in the chloroplasts __, which are located within the leaf cells of the plant.
7.
Roots of the plant are important because they get _ water or H
2
O _ which plants need for photosynthesis.
Chemical Formulas Write the chemical formula for each molecule.
8.
C
6
H
12
O
6
Glucose
9.
_ H
2
O Water
10.
CO
2
Carbon Dioxide
11.
_ O
2
Oxygen
12.
Write the balanced chemical equation for photosynthesis.
6 H
2
O + 6 CO
2
 C
6
H
12
O
6
+ 6O
2
13.
Write the balanced chemical equation for cellular respiration.
C
6
H
12
O
6
+ 6O
2
 6 H
2
O + 6 CO
2
14.
We are unable to live without plants. What do they provide for us to be able to stay alive?
Oxygen gas
15.
(a)What were the elements and compounds in Earth’s atmosphere BEFORE plants evolved?
Nitrogen gas plus compounds of sulfur and carbon dioxide.

(b) The first photosynthesis on Earth involved sulfur and archea bacteria and did not produce oxygen gas.
(c) cyanobacteria in the ocean were the first organisms to do regular photosynthesis that produced both glucose and oxygen gas. The oxygen gas in the atmosphere caused a mass extinction of most of the living organisms that relied on sulfur. However, the oxygen gas allowed organisms that relied on oxygen gas to do well, and land plants and animals to thrive due to the ozone layer blocking harmful UV rays from the sun.
These are not in order. Sequence the steps of photosynthesis to show the order of photosynthesis on the lines below. (Multiple correct answers are possible)
A.
Packets of energy (photons) from sunlight start a reaction between two compounds in the chloroplast.
B.
6 molecules of water enter the plant through the roots.
C.
Using active transport, the leaf cell exports glucose molecules to other parts of the plant.
D.
6 molecules of oxygen (O
2
) are released from the leaf into the atmosphere.
E.
6 molecules of CO
2 diffuse from the leaf stomata through the leaf towards the chloroplast.
F.
Capillary action takes the H
2
O up the stem to a leaf.
G.
A Glucose molecule is stored in fruit or elsewhere in the plant.
H.
6 Carbon dioxide molecules enter through stomata of the plant leaves.
I.
Water and carbon dioxide meet in the chloroplast.
J.
Osmosis causes the H
2
O to move from the stem through leaf cells containing chloroplast.
K.
A chemical reaction produces glucose and oxygen.
Actual sequence:
_B_ __F __J __C_ __G_
_H_ __E_
_I _A _K_
_D
16.
Write the following script on lined paper.
Scene: An apple orchard. Main characters in Act One are carbon dioxide molecules and water molecules.
Begin with the CO
2
in the air and the H
2
O in the soil. In your script, include the steps the characters will take in getting from the environment to a plant. Describe the journeys of the molecules throughout the entire process of photosynthesis, with a new character introduced at the end of Act One, where the new character is an apple. Include details about the path that molecules take to interact with each other. In Act Two the characters have been transformed, plus a new character arrives on the scene, being Johnny (or Janey)
Appleseed. Describe the action as Johnny (or Janey) is able to use the two products of Act One. Include action showing how the two products of Act One got to Johnny (or Janey) so that they could have energy to do things

and to live. In Act Two use both the chemical name and “common name” for the energy related product of
Act One. Be sure to use the formula for the process that gives them energy to do things.
One possible format is to list each character, then to state their action or thoughts.
Act One: 3 kinds of characters: (a) sets of six flying carbon dioxide molecules, very flighty and fast moving
(b) sets of six water molecules, slow moving, staying in the soil. (c) an apple tree, trying its best to grow an apple, but needing to get cooperation from the other characters.
Tree: “Hey, you flighty carbon dioxide molecules, I’ve got something really cool to show you. Why don’t you enter these little holes in my leaf here, so you can see something special?”
Carbon dioxide molecule #1: “Don’t do it, guys, our parents told us to beware strangers like this one. He might rip us apart. Stay away.” Carbon dioxide molecule #7. “Come on, my five buddies, we’re a gas and can escape any time, let’s see what’s inside.” (In they go).
Meanwhile, down in the soil: etc….