Question

1. place an x in each row to indicate whether the description refers to a chemoautotroph or a photoautotroph.

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$$\begin{tabular}{|l|l|l|} \\hline \\textbf{description} & \\textbf{chemoautotroph} & \\textbf{photoautotroph} \\\\ \\hline kelp release oxygen into water as they carry out photosynthesis. & & \\\\ \\hline bacteria that live in hot springs use chemicals to make their own food. & & \\\\ \\hline blue-green algae are cyanobacteria that make their own food through photosynthesis. & & \\\\ \\hline microbes produce sugars in the guts of tube worms that take in chemical-rich water from hydrothermal vents. & & \\\\ \\hline \\end{tabular}$$

Explanation:

Analyze the first description

The description states: "Kelp release oxygen into water as they carry out photosynthesis."

• Photosynthesis uses light energy.
• Organisms using light are photoautotrophs.
• Therefore, this refers to a photoautotroph.

Analyze the second description

The description states: "Bacteria that live in hot springs use chemicals to make their own food."

• These organisms use chemical energy.
• Organisms using chemical energy are chemoautotrophs.
• Therefore, this refers to a chemoautotroph.

Analyze the third description

The description states: "Blue-green algae are cyanobacteria that make their own food through photosynthesis."

• Photosynthesis uses light energy.
• Organisms using light are photoautotrophs.
• Therefore, this refers to a photoautotroph.

Analyze the fourth description

The description states: "Microbes produce sugars in the guts of tube worms that take in chemical-rich water from hydrothermal vents."

• Hydrothermal vents provide inorganic chemicals.
• These microbes use chemical energy.
• Therefore, this refers to a chemoautotroph.

Answer:

Description	Chemoautotroph	Photoautotroph
Bacteria that live in hot springs use chemicals to make their own food.	X
Blue-green algae are cyanobacteria that make their own food through photosynthesis.		X
Microbes produce sugars in the guts of tube worms that take in chemical-rich water from hydrothermal vents.	X