Which of the following are autotrophs?

1. deer

2. plants

3. leopards

4. mushrooms

The principal chemical compound that living things use to store energy is

1. DNA.

2. ATP.

3. H₂O.

4. CO₂.

The amount of energy stored in a molecule of ATP compared to the amount stored in a molecule of glucose is

1. greater.

2. less.

3. the same.

4. variable, depending on conditions.

When a candle burns, energy is released in the form of

1. carbon dioxide and water.

2. the chemical substance ATP.

3. light and heat.

4. electricity and motion.

How do heterotrophs and autotrophs differ in the way they obtain energy?

Describe the three parts of an ATP molecule.

Compare the amounts of energy stored by ATP and glucose. Which compound is used by the cell as an immediate source of energy?

In addition to light and chlorophyll, photosynthesis requires

1. water and oxygen.

2. water and sugars.

3. oxygen and carbon dioxide.

4. water and carbon dioxide.

The leaves of a plant appear green because chlorophyll

1. reflects blue light.

2. absorbs blue light.

3. reflects green light.

4. absorbs green light.

Write the basic equation for photosynthesis using the names of the starting and final substances of the process.

What role do plant pigments play in the process of photosynthesis?

Identify the chloroplast structures labeled A, B, and C. In which structure(s) do the light-dependent reactions occur? In which structure(s) do the light-independent reactions take place?

Form a Hypothesis Although they appear green, some plant leaves contain yellow and red pigments as well as chlorophyll. In the fall, those leaves may become red or yellow. Suggest an explanation for these color changes.

Design an Experiment Design an experiment that uses pond water and algae to demonstrate the importance of light energy to pond life. Be sure to identify the variables you will control and the variable you will change.

Predict Suppose you water a potted plant and place it by a window in a transparent, airtight jar. Predict how the rate of photosynthesis might be affected over the next few days. What might happen if the plant were left there for several weeks? Explain.