Comprehension quiz

Exploring the Hadal Zone

Listen to the lesson carefully, then answer 10 comprehension questions. Pick one option per question.

Question 1What is the main topic of this lecture?

The formation of ocean trenches over time The surface exploration of the Moon The fishing industry in deep waters Life and exploration in the deepest ocean zone

Question 2What did later footage reveal about fish in the hadal zone?

Fish cannot survive below eight thousand metres Fish survive deeper than the earlier limit suggested Fish completely avoid the deepest trenches Fish only live near hydrothermal vents

Question 3According to the speaker, what delayed return expeditions to the deepest point?

A lack of scientific interest in the zone Political disputes between research nations The prohibitive cost of the engineering Dangerous weather above the trenches

Question 4At what depth does the hadal zone begin, according to the lecture?

Below six thousand metres Below one thousand metres Below eight hundred metres Below sixty thousand metres

Question 5How does the speaker compare the hadal trenches with the Moon?

They remain less explored than the surface of the Moon They are considerably easier to reach than the Moon They contain more water than the surface of the Moon They were mapped long before the Moon was mapped

Question 6What was the long-held assumption about the extreme pressure in the trenches?

That it precludes complex life from existing there That it increases together with water temperature That it slowly destroys every kind of protein That it attracted the earliest research expeditions

Question 7When did the first crewed descent reach the deepest point of the ocean?

In nineteen ninety-six In nineteen sixty In eighteen ninety-six In two thousand and six

Question 8What is the function of the molecules called piezolytes in deep sea organisms?

They produce light to attract smaller prey They allow fish to survive without any oxygen They stabilise delicate proteins against the crushing pressure They store energy from chemicals in the vent water

Question 9Why is the snailfish able to survive such extreme pressure?

Its rigid shell resists the force of the water Its thick skin keeps out the microplastics Its powerful muscles push against the seabed Its body lacks rigid structures that pressure would destroy

Question 10What does the presence of microplastics in the hadal zone demonstrate?

That trenches filter pollution out of the water That landers release plastics during their missions That fish carry human waste down from the surface That no corner of the ocean remains untouched