Sharks

Tests: 6 of 11 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 10 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 28 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 · ★★ · wrong ✗

the teacher says sharks got no bones. is she having a laugh?

1. Yes, sharks have more bones than us — ← Mova's choice · no support
2. No, she's right, a shark's skeleton is cartilage — ✓ the right answer · no support
3. No, sharks have no skeleton at all — no support
4. Yes, only baby sharks lack bones — 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 2 · ★★ · right ✓

In Jaws the shark hunts people on purpose. What's closer to the truth?

1. Sharks hunt boats, not people — score 2
2. Sharks only ever eat people who can't swim well and splash about a lot — score 2
3. Bites are very rare and often a case of mistaken identity — ← Mova's choice · ✓ the right answer · score 9
4. Sharks hunt people every day — score 3

Why: It took the question to ask which statement is true. It chose option 3 with score 9, against 3 for the next best. Its support: lesson 28, line 10: «Sharks don't hunt humans; bites are very rare and often a mistake, and people kill around 100 million sharks a year.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «bites» (+5); the same property (+2); the same light verb (be, have, do, get, go) (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · right ✓

Count them: a shark has a row of five gill slits on each side. How many gill slits is that?

1. 10 — ← Mova's choice · ✓ the right answer · no support
2. 5 — no support
3. 20 — no support
4. 15 — 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 ✗

What would happen to a great white if it got stuck in a net and couldn't swim?

1. It would rest safely on the bottom like a nurse shark does all day — ← Mova's choice · score 8
2. It would breathe air instead — no support
3. It could not get enough water over its gills to breathe — ✓ the right answer · score 3
4. It would float to the top and sunbathe — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 8, against 3 for the next best. Its support: lesson 28, line 12: «Some sharks, like great whites and makos, must keep swimming to push water over their gills, while nurse sharks can rest on the bottom.», reached through the same lesson line as the sentence the question matched. What matched: the same action «rest» (+5); the same place «bottom» (+3). The right option, 3, scored 3. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · right ✓

My uncle says a shark can smell one drop of blood from miles away. Is that right?

1. No, that is exaggerated; sharks smell blood well, but not from miles off — ← Mova's choice · ✓ the right answer · score 9
2. No, sharks cannot smell at all — score 0
3. Yes, but only great whites — no support
4. Yes, any shark can smell blood across a whole ocean — score 7

Why: It took the question to ask which statement is true. It chose option 1 with score 9, against 7 for the next best. Its support: lesson 28, line 9: «Sharks smell blood well, but the story that they can smell one drop from miles away is exaggerated.», reached through the remembered sentence the question matched. What matched: the same thing acted on «blood» (+4); the same doer «sharks» (+2); the same property (+2); the same action «smell» (+1). · the question and its options parsed, with trees and pragmatics

Test 6 · ★★ · right ✓

Why would a swimsuit maker copy shark skin?

1. It keeps the swimmer warm — no support
2. It stops sharks noticing you — no support
3. Its tiny scales help water flow smoothly, so you swim faster — ← Mova's choice · ✓ the right answer · score 12
4. It makes the swimmer look big and scary to the sharks in the water — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 12, the only option with support. Its support: lesson 28, line 15: «Shark skin is covered in tiny tooth-like scales called dermal denticles that help water flow smoothly, and some swimsuits copy them.», reached through the same lesson line as the sentence the question matched. What matched: the same action «flow» (+5); the same doer «tiny like scales» (+5); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · right ✓

dude a whale shark is swimming right next to me, am i gonna get eaten??

1. No, it eats only plankton and tiny fish — ← Mova's choice · ✓ the right answer · score 4
2. Yes, but only if you splash about and kick your legs — no support
3. No, because it has no mouth — no support
4. Yes, it eats anything that big — score 2

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 28, line 5: «And the biggest shark of all, the whale shark, up to 12 to 18 metres long, eats only plankton and tiny fish and lets snorkellers swim beside it.», reached through the option's own match among the sentences about the question's things. What matched: the same action «eat» (+2); the same doer «biggest shark» (+1); the same thing acted on «plankton» (+1). · the question and its options parsed, with trees and pragmatics

Test 8 · ★★ · wrong ✗

If many sharks were killed in one sea, what might happen to the other fish?

1. The fish would turn into sharks — score 2
2. Sick fish would spread disease and the balance would be upset — ✓ the right answer · score 2
3. All the other fish would get much healthier at once and live far longer — ← Mova's choice · score 4
4. Nothing, sharks don't eat fish — score 4

Why: It took the question to ask what happens next. It chose option 3 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 28, line 3: «Sharks have senses you don't: pores on the snout, the ampullae of Lorenzini, feel the faint electricity of a fish's muscles, so a shark can find a fish hiding…», reached through what followed the sentence the question matched. What matched: the same doer «fish» (+4). The right option, 2, scored 2. · the question and its options parsed, with trees and pragmatics

Test 9 · ★★ · wrong ✗

A Greenland shark grows about a centimetre a year and is 4 metres long. What does that tell you?

1. It must be about 4 years old — score 7
2. It must have grown fast as a baby — ← Mova's choice · score 8
3. It must be a young whale shark — score 4
4. It must be very, very old — ✓ the right answer · no support

Why: It took the question to ask what it is done to. It chose option 2 with score 8, against 7 for the next best. Its support: lesson 28, line 17: «The Greenland shark is the longest-living animal with a backbone known, probably at least 270 years, growing about a centimetre a year.», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+4); the same doer «greenland shark» (+4). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · wrong ✗

In Finding Nemo the shark promises "fish are friends, not food". What do real sharks eat?

1. Real sharks eat only swimmers and surfers — score 9
2. Many eat fish, seals or squid — ✓ the right answer · score 8
3. Every shark eats only plankton — ← Mova's choice · score 13
4. Real sharks eat only green seaweed — score 7

Why: It took the question to ask what it is done to. It chose option 3 with score 13, against 9 for the next best. Its support: lesson 28, line 5: «And the biggest shark of all, the whale shark, up to 12 to 18 metres long, eats only plankton and tiny fish and lets snorkellers swim beside it.», reached through the option's own match among the sentences about the question's things. What matched: the same action «eat» (+4); the same doer «biggest shark» (+4); it fills the role the question asks for (+3); the same thing acted on «plankton» (+2). The right option, 2, scored 8. · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · right ✓

Why do you think sharks' numbers fall so fast when many are caught?

1. They lay millions of eggs — no support
2. They live only a year anyway — no support
3. They grow slowly and have few young — ← Mova's choice · ✓ the right answer · score 1
4. They swim into nets on purpose — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 1, the only option with support. Its support: lesson 19, line 16: «There are only about 5,500 wild tigers, mostly in India; they lost most of their forests to farms and were hunted for skins and bones, but numbers in India and…», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the material of which the skeleton of a shark is principally composed.

1. Calcium shell — ← Mova's choice · no support
2. Cartilage — ✓ the right answer · no support
3. Calcified coral — no support
4. Ossified bone — 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 · wrong ✗

Which of the following statements most accurately characterises the threat posed by sharks to human beings?

1. Fatal incidents are exceedingly rare and frequently attributable to mistaken identity — ✓ the right answer · no support
2. The threat exceeds that which humans pose to sharks — no support
3. Sharks habitually pursue human beings as their principal and preferred prey in every ocean — ← Mova's choice · score 9
4. Sharks attack all persons who enter the water — score 9

Why: It took the question to ask who or what does it. It chose option 3 with score 9, tied with another option at 9 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 28, line 18: «Some sharks and rays lay eggs in leathery cases called mermaid's purses, while other sharks give birth to live pups.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same doer «sharks» (+4); a different thing acted on (counts against) (+1). Against it: a different action (counts against) (-2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Ascertain the faculty by which a shark may detect prey concealed beneath the sand.

1. Vision through the sand — ← Mova's choice · no support
2. Taste at a great distance — no support
3. Electroreception by means of the ampullae of Lorenzini — ✓ the right answer · no support
4. Detection of light emitted by the prey — 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 · right ✓

Select the response consistent with the established facts concerning the longevity of the Greenland shark.

1. It is believed to attain at least two hundred and seventy years — ← Mova's choice · ✓ the right answer · no support
2. It attains no more than seven years — no support
3. It is immortal — no support
4. It attains approximately twenty-seven years — no support

Why: Nothing it remembers matched the question, 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/28-sharks/