The deep dark: anglerfish, giant squid, blobfish and whale falls

Tests: 7 of 12 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 11 of 16 · Run: 2026-10-18, commit f3c23ea72

Lesson 176 of the biology course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · ★★ · right ✓

In Finding Nemo a huge anglerfish chases Marlin and Dory with a glowing lure. What is real?

1. The lure is real, but many deep anglerfish are smaller than a football — ← Mova's choice · ✓ the right answer · score 7
2. The lure is a cartoon invention — no support
3. Real anglerfish use torches — no support
4. Real anglerfish are as big as buses — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 7, the only option with support. Its support: lesson 176, line 5: «Deep-sea anglerfish have a glowing lure on their heads to attract prey, and in many kinds the light comes from glowing bacteria living inside the lure; many ki…», reached through the same lesson line as the sentence the question matched. What matched: the same property (+3); the same circumstance (+3); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · right ✓

«we know more about the Moon than the deep sea, AND more people walked on the Moon than went to the deepest bit» What is right?

1. The first part is often said, but by 2022 more than twenty people had reached the deepest point, more than the twelve on the Moon — ← Mova's choice · ✓ the right answer · score 5
2. Thousands have walked on the Moon — score 5
3. Both are still exactly true — no support
4. Nobody has ever been to the deepest point — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 103, line 7: «Kangaroos cannot easily walk backwards, and people often say this is why the kangaroo, an animal that goes forward, is on Australia's coat of arms.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+3); the same action «say» (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · wrong ✗

In a cartoon a vampire squid bites a diver's neck to drink blood. What is real?

1. It drinks blood every night — ← Mova's choice · score 5
2. It has fangs like a bat — no support
3. It lives in old castles on the cliffs and flies out over the sea at night — score 2
4. It eats drifting bits of dead stuff and hides under its cloak of arms — ✓ the right answer · score 5

Why: It took the question to ask which statement is true. It chose option 1 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 95, line 12: «Only three of more than 1,400 kinds of bat drink blood; they live in Central and South America, make a tiny cut on sleeping animals and lap the blood.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «blood» (+3); the same action «drink» (+2). The right option, 4, scored 5. · the question and its options parsed, with trees and pragmatics

Test 4 · ★★ · wrong ✗

«2 dumbo octopuses n a giant squid, how many arms and tentacles»

1. 18 — ← Mova's choice · no support
2. 20 — no support
3. 26 — ✓ the right answer · no support
4. 24 — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · right ✓

«4 hagfish all slimed a bucket each, how many buckets of slime»

1. 4 — ← Mova's choice · ✓ the right answer · no support
2. 2 — no support
3. 1 — no support
4. 8 — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 6 · ★★ · right ✓

What would happen to a blobfish in its deep home if nobody pulled it up?

1. It would float right up to the surface — no support
2. It would look like a normal fish — ← Mova's choice · ✓ the right answer · score 7
3. It would melt into a puddle of jelly at once — no support
4. It would turn bright pink and then explode — no support

Why: It took the question to ask what happens next. It chose option 2 with score 7, the only option with support. Its support: lesson 176, line 10: «Blobfish look like sad jelly blobs in photos because they are hurt when pulled up from the deep, but in their deep home they look like normal fish; a photo of…», reached through what followed the sentence the question matched. What matched: the same action «look» (+4); the same circumstance (+4). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · wrong ✗

«ugliest animal in the world is the blobfish, it's proven» What is right?

1. Yes, scientists measured ugliness — no support
2. Yes, it looks like that all its life — ← Mova's choice · score 2
3. That vote used a photo of a fish hurt by being pulled up, so it was not fair — ✓ the right answer · no support
4. No, the blobfish is a kind of jellyfish — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 2, the only option with support. Its support: lesson 175, line 14: «Many deep-sea animals are red or black, because red light does not reach the deep, so a red animal looks black and is hard to see; some deep fish even make red…», reached through the option's own match among the sentences about the question's things. What matched: the same action «look» (+2). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 8 · ★★ · wrong ✗

Scientists drop a dead whale's body in deep water and come back years later. What will they most likely find?

1. Nothing left at all after one day — ← Mova's choice · score 5
2. A whale that came back to life — no support
3. The same body untouched — score 5
4. Animals still living off it, including worms on the bones — ✓ the right answer · score 3

Why: It took the question to ask what it is done to. It chose option 1 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 67, line 19: «Swallowed chewing gum is not digested, but it does not stay inside for 7 years: it passes through and leaves the body in a few days, like other things we canno…», reached through the option's own match among the sentences about the question's things. What matched: the same action «leave» (+3); the same property (+1); a different doer (counts against) (+1). The right option, 4, scored 3. · the question and its options parsed, with trees and pragmatics

Test 9 · ★★ · right ✓

In Pinocchio a giant whale swallows a boat. Which real whale dives into the deep to hunt giant squid?

1. The blue whale, using its big eyes in the dark — score 8
2. Killer whales that only eat boats — score 5
3. No whale goes into the deep — score 7
4. The sperm whale, using clicks to find them — ← Mova's choice · ✓ the right answer · score 12

Why: It took the question to ask what it is done to. It chose option 4 with score 12, against 8 for the next best. Its support: lesson 26, line 12: «Sperm whales dive more than 1,000 metres deep, can hold their breath for over an hour, hunt squid using clicks, and have the biggest brain of any animal, aroun…», reached through the same lesson line as the sentence the question matched. What matched: the same action «use» (+4); the same doer «sperm whales» (+3); it fills the role the question asks for (+3); the same thing acted on «clicks» (+2). · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · right ✓

«hagfish tying itself in a knot, is it ok» What is going on?

1. It is dying of cold — no support
2. It is lost — no support
3. It is trying to sleep in a knot so it does not drift — no support
4. It ties knots to wipe off its slime and tear food — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask who or what does it. It chose option 4 with score 8, the only option with support. Its support: lesson 176, line 12: «Hagfish make huge amounts of slime when attacked, enough to fill a bucket in seconds, and they tie themselves in knots to wipe the slime off and to tear food.», reached through a sentence linked to the one the question matched. What matched: the same action «wipe off» (+6); the same thing acted on «slime» (+3). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · wrong ✗

«that eel ate a fish as big as itself, impossible» What is right?

1. Gulper eels can, because their mouths open very wide and stomachs stretch — ✓ the right answer · score 2
2. It must have been two eels — ← Mova's choice · score 5
3. The fish swam out again — score 1
4. Yes, impossible for any fish — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 5, against 2 for the next best. Its support: lesson 45, line 13: «An electric eel can make shocks of up to about 860 volts in one kind described in 2019, from many small electric cells firing together; it is really a knifefis…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «knifefish» (+3); the same light verb (be, have, do, get, go) (+2). The right option, 1, scored 2. · the question and its options parsed, with trees and pragmatics

Test 12 · ★★ · right ✓

A deep fish has huge eyes but lives where sunlight never reaches. Why does it need them?

1. They are left over from its ancestors and useless — no support
2. To catch faint light from glowing animals — ← Mova's choice · ✓ the right answer · score 9
3. To scare people — no support
4. It needs them to see the Sun high above — score 1

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 9, against 1 for the next best. Its support: lesson 176, line 13: «Many deep fish have big eyes to catch faint light from glowing animals, and some have tube-shaped eyes that look upward.», reached through the cause of the sentence the question matched. What matched: the same action «catch» (+4); the same thing acted on «faint light» (+4); the same circumstance (+3). Against it: a different doer (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Identify the source of luminescence in the lure of numerous species of deep-sea anglerfish.

1. Light-producing bacteria residing within the lure — ← Mova's choice · ✓ the right answer · score 0
2. A store of sunlight absorbed during the day at the surface — no support
3. Reflection of light from the eyes of prey — no support
4. Friction of the lure against the water — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 0, the only option with support. Its support: lesson 176, line 5: «Deep-sea anglerfish have a glowing lure on their heads to attract prey, and in many kinds the light comes from glowing bacteria living inside the lure; many ki…», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+2). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the diet of the vampire squid?

1. It consumes exclusively living crabs captured upon the sea floor — ← Mova's choice · no support
2. It hunts whales of considerable size — no support
3. It consumes drifting particles of dead organic matter — ✓ the right answer · no support
4. It subsists upon the blood of fish — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Ascertain the reason for which photographs of the blobfish misrepresent its natural appearance.

1. It is in all circumstances a gelatinous mass — ← Mova's choice · no support
2. It is photographed exclusively in old age — no support
3. It is invariably photographed while asleep — no support
4. The fish is damaged when it is brought up from the great depths it inhabits — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Select the response consistent with the established facts concerning a whale carcass upon the deep sea floor.

1. It is consumed entirely within one day — ← Mova's choice · no support
2. It rises to the surface on the following day and is carried away by the currents — no support
3. It is petrified within a short period — no support
4. It sustains communities of deep-sea animals for a period of years — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/176-the-deep-dark-anglerfish-giant-squid-blobfish-and-whale-falls/