Deep-Sea Creatures

Question 1

The midnight lantern jelly lives deep in the ocean where no sunlight reaches. It glows faintly in the dark water. Which sentence correctly explains why this glow is an example of bioluminescence?

Accepted Answer

The jelly’s own cells mix a chemical called luciferin with oxygen to make light.

Answer

Sunlight that traveled from the surface is reflected off the jelly’s shiny skin.

Answer

Tiny pieces of glowing rock in the water stick to the jelly and make it shine.

Answer

The jelly absorbs heat from a nearby hydrothermal vent and turns it into light.

Question 2

A tube worm lives near a hydrothermal vent deep in the ocean where no sunlight reaches. Which explanation best describes how the vent allows the worm and other animals to survive?

Accepted Answer

The vent releases chemicals such as hydrogen sulfide that bacteria use to make food through chemosynthesis, providing energy for the worm.

Answer

The vent’s hot water warms the surrounding water, and the warmth alone gives the worm enough energy to grow.

Answer

The vent emits a faint glow that the worm uses for photosynthesis, similar to plants.

Answer

The worm eats dead plankton that drift down from the surface, so it does not need the vent at all.

Question 3

Which pair lists one true adaptation for seeing in the deep‑sea darkness and one true adaptation for withstanding the immense pressure?

Accepted Answer

Huge, tubular eyes that can detect faint glows, and a jelly‑like body without air‑filled spaces that lets the animal be squished without damage.

Answer

Bright, rainbow colors that blend with sunlight, and a hard, calcium‑rich shell that protects against crushing pressure.

Answer

Ability to produce its own light for hunting, and lungs that store air for breathing at depth.

Answer

Very small eyes that see almost nothing, and a thick layer of fat that insulates against cold water.

Try three questions

The midnight lantern jelly lives deep in the ocean where no sunlight reaches. It glows faintly in the dark water. Which sentence correctly explains why this glow is an example of bioluminescence?

A tube worm lives near a hydrothermal vent deep in the ocean where no sunlight reaches. Which explanation best describes how the vent allows the worm and other animals to survive?

Which pair lists one true adaptation for seeing in the deep‑sea darkness and one true adaptation for withstanding the immense pressure?

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