Hydrothermal Vents

Light does not reach the bottom of the ocean, yet certain species live there. Which best explains how species on the bottom of the ocean get energy to live?

• Algae and bacteria produce energy through photosynthesis.
• Hydrothermal vents produce energy through chemical reactions.
• Dead plants and animals produce energy through decomposition.
• Light comes from the core of the earth.

Scientists have found strange new life-forms called “tubeworms” on the deep ocean bottom. Which most likely provides energy for the tubeworms?

• algae
• small fish
• photosynthesis
• hydrothermal vents

Which ocean zone contains hydrothermal vents?

• Deep zone (abyss)
• Surface zone (sunlight)
• Shallow zone (twilight)
• Midnight zone

Deep ocean technology has discovered organisms in hydrothermal vents that do not rely on sunlight to survive. What do these organisms use as their energy source?

• chemosynthesis
• electrical charge
• hydropower
• thermal heat

Which is most likely to be the energy source for organisms living in hydrothermal vents?

• oxygen
• sunlight
• methane or sulfur
• carbon dioxide

Which contributes most in supporting life on the deep ocean floor?

• cold water temperatures
• extreme water pressure
• hydrothermal vents
• lack of predators

• Benthic & Aphotic zone
• Benthic & Photic zone
• Neritic & Aphotic zone
• Oceanic & Photic zone