Unit 9 Review/CAPT Practice Sheet
The following equation represents the process of photosynthesis in green plants.
1. What happens to most of the light energy during photosynthesis?
a. It is transformed into heat energy.b. It is transformed into chemical energy.
c. It is changed into carbon dioxide.d. It is changed into oxygen.
2. Which statement about green plants is true?
a. Most green plants do not need food.
b. Most green plants take in food through their roots.
c. Most green plants take in food through their leaves.
d. Most green plants manufacture their own food.
A group of organisms that interact with and depend upon one another is called a community. The movement of matter and energy through a community can be studied by examining its food web. As organisms eat other organisms, energy and nutrients pass through various feeding levels. These feeding levels are called trophic levels. The following is a diagram of the energy and nutrient flow through a simple community.
3. Which group would most likely contain living algae?
a. producersb. first-order consumers c. second-order consumersd. decomposers
4. According to the diagram, nutrients from dead organisms are released into the soil by the action of ______.
a. producersb. first-order consumers c. third-order consumersd. decomposers
The diagram shows part of an aquatic food web for a stable lake ecosystem in Connecticut.
5. What is the source of energy for the algae?
a. wavesb. sunlightc. bacteriad. rotifers, water fleas and tadpoles
6. Which of the following statements best explains why all animals need food in order to live?
a. Body mass must be maintained, and food supplies the needed body mass.
b. Cells, tissues, & organs require energy to carry out their tasks, & food provides the needed energy.
c. A balanced diet is necessary to maintain strong bones and healthy teeth.
d. Food contains essential vitamins and minerals bodies need in order to synthesize other nutrients.
7.The figures below show the reaction rate of a specific enzyme at different temperatures and different pHs.
What can be concluded about the enzyme?
a.The enzyme works best at a pH of 8 and a temperature of 25C.
b.The enzyme only works at a pH of 8 and a temperature of 25C.
c.The enzyme is used up at a pH of 11 and a temperature of 35C.
d.The enzyme works better at a pH of 8 than a temperature of 25C.
8.
Enzymes 2
Science students conducted an investigation to determine how enzymes affect apple juice production.
Procedure:
1. Place coffee filter in paper cone; cut off 2 cm of the bottom of the cone, leaving a small hole.
2. Place 30 mL of apple sauce into measuring cup, add 5 drops of enzyme A solution, and stir thoroughly.
3. Place a graduated cylinder under paper cone and add apple sauce to coffee filter, stirring every minute.
4. Measure volume of apple juice in cup after 5 minutes using graduated cylinder.
5. Repeat steps 1– 4 for a second trial.
6. Repeat steps 1–5 using enzyme B solution.
7. Repeat steps 1–5 using water.
Amount of Juice Produced
Enzyme Solution / Trial 1 (ml) / Trial 2 (ml) / Average (ml)A / 14 / 15 / 14.5
B / 6 / 5 / 5.5
Water / 5 / 5 / 5.0
a) Identify two variables that were held constant in the group’s experiment.
b) Explain why it is important for these variables to be held constant.
9.
10.