Sharks by kind, small and strange: walking sharks, wobbegongs, cookiecutters and goblin sharks

Tests: 4 of 11 right · Exam: 4 of 4 right · Kind: ★ · Understood: 12 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 311 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 ✓

«saw a vid of a shark WALKING lol fake right» What is the best reply?

1. Fake, no fish has ever moved over rock — no support
2. Probably real; epaulette sharks walk between rock pools on their fins — ← Mova's choice · ✓ the right answer · score 1
3. Fake, sharks die the moment they touch rocks — no support
4. Real, but only sharks in zoos can do it, after they are trained by keepers — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 1, the only option with support. Its support: lesson 311, line 2: «Some walk on their fins across rock pools, some lie on the seabed looking like a frilly carpet, and one tiny shark takes round bites out of whales as if with a…», reached through the remembered sentence the question matched. What matched: the same place «fins» (+2); the same circumstance (+2). Against it: a different doer (counts against) (-3). · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · wrong ✗

Count them: 3 epaulette sharks walk across a reef using their paired fins as legs. How many fin-legs are moving?

1. 9 — ← Mova's choice · no support
2. 3 — no support
3. 12 — ✓ the right answer · no support
4. 6 — 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 3 · ★ · wrong ✗

Count them: you find 2 mermaid's purses on the beach. How many curly corners do they have together?

1. 6 — ← Mova's choice · no support
2. 2 — no support
3. 8 — ✓ the right answer · no support
4. 4 — 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 4 · ★ · wrong ✗

A mate wades out and nearly steps on a lumpy patterned carpet on the seabed. What should he do?

1. Pick it up to take home — ← Mova's choice · score 3
2. Stamp on it to see if it moves — score 0
3. Pull its frilly beard to check that it is only an old rug — no support
4. Back off and not touch it; it may be a wobbegong that bites if trodden on — ✓ the right answer · no support

Why: It took the question to ask what is done. It chose option 1 with score 3, against 0 for the next best. Its support: lesson 264, line 13: «Camera traps take pictures when an animal moves past, which helps count rare animals such as snow leopards, and each snow leopard can be recognised by its own…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same action «take» (+2). Against it: a different doer (counts against) (-2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · wrong ✗

«look this dolphin's got perfect round holes in it, like someone used a cookie cutter» What most likely made them?

1. A cookiecutter shark's spinning bite — ✓ the right answer · no support
2. A boat propeller drawing perfect circles — no support
3. Bad sunburn on the dolphin's thin skin — ← Mova's choice · score 3
4. A great white shark taking a single bite — no support

Why: It took the question to ask a circumstance (with what, when, how). It chose option 3 with score 3, the only option with support. Its support: lesson 57, line 12: «Pea plants climb with tendrils that wrap round whatever they touch, reaching the light without building a thick stem; ivy climbs with tiny gripping roots.», reached through the remembered sentence the question matched. What matched: the same action «build» (+3); the same thing acted on «thick stem» (+2). Against it: a different doer (counts against) (-2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · wrong ✗

What would happen if a goblin shark could not shoot its jaws forward?

1. It would have to live in rivers — ← Mova's choice · score 7
2. It would miss more fast prey in the dark — ✓ the right answer · score 3
3. It would have to start eating seaweed off the rocks — score 1
4. It would stop being pink — score 7

Why: It took the question to ask what happens next. It chose option 1 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 178, line 3: «Among those roots live fish that walk on mud, fish that shoot down insects with a squirt of water, crabs waving one giant claw, and in the biggest mangrove for…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «fish» (+4); the same action «live» (+3). The right option, 2, scored 3. · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · wrong ✗

In a cartoon every shark is a huge grey monster with a fin sticking out of the water. What is the truth?

1. Sharks are always grey, never patterned — score 2
2. Many sharks are small, flat, glowing or strange; some are shorter than your arm — ✓ the right answer · score 2
3. Only great white sharks are real sharks, and the others are just big fish — ← Mova's choice · score 3
4. All sharks are at least 5 metres long — score 2

Why: It took the question to ask which statement is true. It chose option 3 with score 3, against 2 for the next best. Its support: lesson 298, line 7: «Whales are mammals, not fish: they breathe air, have warm blood, feed their babies milk and even have a few hairs, while sharks are fish.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «fish» (+2); the same light verb (be, have, do, get, go) (+2). Against it: the same doer «sharks» (-1). The right option, 2, scored 2. · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

Why could a shark as big as the megamouth stay hidden until 1976?

1. It lives in the vast deep sea where few people look — ← Mova's choice · ✓ the right answer · score 6
2. It was invisible until then — no support
3. It hid in rivers away from the sea — score 2
4. It only appeared in 1976, when it suddenly evolved from another shark — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 2 for the next best. Its support: lesson 311, line 3: «In the deep dark sea live sharks that glow, a pink shark that shoots its jaws out of its face, and a big gentle shark with a huge mouth that nobody knew about…», reached through the same lesson line as the sentence the question matched. What matched: the same action «live» (+4); the same doer «sharks» (+1); the same place «deep dark sea» (+1). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

Count it: a whale shark can be about 60 times as long as a dwarf lanternshark. If a lanternshark is 20 centimetres, about how long is the whale shark?

1. About 1.2 metres — score 1
2. About 80 centimetres — no support
3. About 12 metres — ✓ the right answer · score 1
4. About 60 metres long — ← Mova's choice · score 4

Why: It took the question to ask what something is like. It chose option 4 with score 4, against 1 for the next best. Its support: lesson 311, line 14: «The dwarf lanternshark of the Caribbean deep is one of the smallest sharks, about 20 centimetres long, shorter than a 30-centimetre school ruler; it glows.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «dwarf lanternshark» (+2); it fills the role the question asks for (+2). The right option, 3, scored 1. · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · right ✓

«why would a fish get FATTER to stay safe, makes no sense» What is the answer for a swell shark?

1. It turns into a rock when it swells — score 6
2. It floats up into the air like a balloon and drifts away from danger — score 6
3. Fat fish taste bad to every predator — score 6
4. Swelling up wedges it tight in a crack so it cannot be pulled out — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 8, against 6 for the next best. Its support: lesson 290, line 14: «Black soldier fly larvae eat food waste and are turned into food for chickens and farmed fish, which saves wild fish from being caught as feed.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «wild fish» (+4); the same doer «chickens» (+3); a different action (counts against) (+1). · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

Why might a little shark that glows on its belly be harder to spot from below?

1. Its glow matches the light coming down from the surface — ← Mova's choice · ✓ the right answer · score 6
2. Light from below is always dark — no support
3. Glowing makes animals see-through — score 6
4. The glow blinds every hunter for ever, so none can see it again — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 311, line 14: «The dwarf lanternshark of the Caribbean deep is one of the smallest sharks, about 20 centimetres long, shorter than a 30-centimetre school ruler; it glows.», reached through the option's own match among the sentences about the question's things. What matched: the same action «glow» (+3); the same doer «shark» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Identify the principal means by which the epaulette shark proceeds between rock pools at low tide.

1. By ambulation upon its paired pectoral and pelvic fins — ← Mova's choice · ✓ the right answer · no support
2. By rolling its body along the substrate — no support
3. By leaping from the water by means of its tail — no support
4. By remaining stationary until the tide returns — 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 2 · formal language · right ✓

Select the response consistent with the established facts concerning the cookiecutter shark.

1. A shark of approximately half a metre removes circular portions of flesh from substantially larger animals — ← Mova's choice · ✓ the right answer · score 4
2. A shark of approximately five metres attacks only vessels — score 1
3. A shark of approximately half a metre subsists exclusively on seaweed — score 2
4. A shark of approximately ten metres consumes whales in their entirety — score 1

Why: It took the question to ask which statement is true. It chose option 1 with score 4, against 2 for the next best. Its support: lesson 311, line 2: «Some walk on their fins across rock pools, some lie on the seabed looking like a frilly carpet, and one tiny shark takes round bites out of whales as if with a…», reached through the option's own match among the sentences about the question's things. What matched: the same action «take» (+3); the same circumstance (+3). Against it: the same doer «one tiny shark» (-1); a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Which of the following statements most accurately characterises the discovery of the megamouth shark?

1. It has been known since antiquity as a common coastal species — no support
2. It was first recorded in 1976 upon becoming entangled in a vessel's sea anchor near Hawaii — ← Mova's choice · ✓ the right answer · score 5
3. It was first identified solely from fossilised teeth discovered in the deserts of North Africa — no support
4. It was first recorded in 1776 by fishermen in the North Sea — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 5, the only option with support. Its support: lesson 311, line 13: «The megamouth shark was first found in 1976, when one got tangled in a ship's sea anchor off Hawaii; it filters tiny shrimp with its huge mouth, and only a few…», reached through the same lesson line as the sentence the question matched. What matched: the same action «tangle» (+3); the same circumstance (+2). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

Ascertain the nature of the object commonly designated a «mermaid's purse».

1. The shell of a deep-sea crab — no support
2. The discarded skin of an adult shark — no support
3. A form of seaweed resembling a pouch, in which small fish shelter from storms — no support
4. The egg case of a catshark, skate or ray, anchored to seaweed by tendrils — ← Mova's choice · ✓ the right answer · score 3

Why: It took the question to ask which statement is true. It chose option 4 with score 3, the only option with support. Its support: lesson 311, line 16: «A mermaid's purse is the egg case of a catshark, skate or ray; curly tendrils at its four corners hold it to seaweed while the baby grows for months.», reached through the remembered sentence the question matched. What matched: the same thing acted on «purse» (+3); the same circumstance (+2). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/311-sharks-by-kind-small-and-strange-walking-sharks-wobbegongs-cookiecutters-and-goblin-sharks/