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:

Define autotrophic types

Autotrophs make their own food.
Photoautotrophs use sunlight energy.
Chemoautotrophs use chemical energy.

Analyze kelp description

Kelp performs photosynthesis.
Photosynthesis uses light energy.
Therefore, kelp is photoautotrophic.

Analyze hot spring bacteria

Bacteria use chemicals.
Chemicals provide metabolic energy.
Therefore, they are chemoautotrophic.

Analyze blue-green algae

Cyanobacteria perform photosynthesis.
Photosynthesis requires light energy.
Therefore, they are photoautotrophic.

Analyze hydrothermal vent microbes

Microbes use chemical-rich water.
Hydrothermal vents lack sunlight.
Therefore, they are chemoautotrophic.

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