Sharks by kind: great white, tiger, bull and hammerhead
Tests: 6 of 12 right · Exam: 1 of 4 right · Kind: ★★★ · Understood: 11 of 16 · Run: 2026-10-18, commit f3c23ea72
Lesson 310 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 ✗
Count them: a great white has 5 gill slits on each side. How many on both sides together?
- 1. 14 — ← Mova's choice · no support
- 2. 10 — ✓ the right answer · no support
- 3. 7 — no support
- 4. 5 — 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 · ★★★ · wrong ✗
Count them: 3 hammerheads swim past. How many eyes, and how many tails?
- 1. 6 eyes and 6 tails — ← Mova's choice · no support
- 2. 3 eyes and 3 tails — no support
- 3. 6 eyes and 3 tails — ✓ the right answer · no support
- 4. 12 eyes and 3 tails — 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 · ★★★ · right ✓
Count them: a shark loses 2 teeth a week. About how many in a year of 52 weeks?
- 1. 104 — ← Mova's choice · ✓ the right answer · no support
- 2. 54 — no support
- 3. 26 — no support
- 4. 520 — 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 · ★★★ · right ✓
In Finding Nemo, Bruce the great white says «fish are friends, not food». What do real great whites usually eat?
- 1. Seals, fish and dead whales — ← Mova's choice · ✓ the right answer · score 4
- 2. Only seaweed salad — score 4
- 3. Nothing but people who swim — no support
- 4. Only other sharks, even their own young — score 4
Why: It took the question to ask what it is done to. It chose option 1 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 310, line 6: «Great whites usually hunt seals, fish and dead whales; most bites on people are thought to be mistakes or test bites, and often the shark swims away. All shark…», reached through the remembered sentence the question matched. What matched: the same property (+2); it fills the role the question asks for (+2). · the question and its options parsed, with trees and pragmatics
Test 5 · ★★★ · wrong ✗
«sharks hunt humans, saw Jaws, never going in the sea» What is the best reply?
- 1. Bites are rare, about 70 a year worldwide, many of them mistakes; follow beach safety — ✓ the right answer · score 3
- 2. Every beach has a great white waiting — no support
- 3. Sharks only bite people in films, never in real life, so swim anywhere you like at any time — ← Mova's choice · score 5
- 4. Sharks hunt people every day — score 2
Why: It took the question to ask which statement is true. It chose option 3 with score 5, against 3 for the next best. Its support: lesson 75, line 14: «Spinosaurus lived in North Africa about 95 million years ago with a back sail and a crocodile-like snout for fish; scientists still argue how well it swam, and…», reached through a sentence linked to the one the question matched. What matched: the same action «swim» (+3); the same doer «fish» (+2). The right option, 1, scored 3. · the question and its options parsed, with trees and pragmatics
Test 6 · ★★★ · wrong ✗
Why might a surfer lying on a board look like a seal to a shark below?
- 1. Sharks think boards are fish — score -2
- 2. From below both make a dark shape against the bright surface — ✓ the right answer · no support
- 3. Surfers smell exactly like seals in the water — ← Mova's choice · score 5
- 4. Surfers bark like seals — no support
Why: It took the question to ask why something happens (its cause). It chose option 3 with score 5, against -2 for the next best. Its support: lesson 310, line 7: «Off South Africa, great whites rush up from deep water at seals and can launch fully into the air; attacking from below works because the seal cannot see into…», reached through the option's own match among the sentences about the question's things. What matched: the same place «dark water» (+3); the same circumstance (+1); a different action (counts against) (+1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 7 · ★★★ · wrong ✗
«a shark in a lake? nah, sharks need the sea innit» What is right?
- 1. Sharks in lakes are always toys — no support
- 2. Only goldfish sharks live in lakes — ← Mova's choice · score 6
- 3. Bull sharks can live in fresh water and have lived in a lake in Australia — ✓ the right answer · score 6
- 4. No shark can survive one minute in fresh water, it would die straight away — score 6
Why: It took the question to ask which statement is true. It chose option 2 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 310, line 12: «Bull sharks can live in fresh water as well as the sea, because their kidneys and glands adjust to water without salt; bull sharks lived for years in a lake on…», reached through the option's own match among the sentences about the question's things. What matched: the same place «lake» (+4); the same action «live» (+3). Against it: the same doer «bull sharks» (-1). The right option, 3, scored 6. · the question and its options parsed, with trees and pragmatics
Test 8 · ★★★ · right ✓
What would happen if a great white stopped swimming for a long time?
- 1. Too little water would flow over its gills — ← Mova's choice · ✓ the right answer · score 10
- 2. It would grow legs — no support
- 3. It would warm up and float — score 1
- 4. It would breathe much better and feel rested — no support
Why: It took the question to ask what happens next. It chose option 1 with score 10, against 1 for the next best. Its support: lesson 310, line 16: «Most sharks have five gill slits on each side, and a few kinds have six or seven; great whites must keep swimming so water flows over their gills, while nurse…», reached through what followed the sentence the question matched. What matched: the same action «flow» (+6); the same place «gills» (+3); the same doer «water» (+1). · the question and its options parsed, with trees and pragmatics
Test 9 · ★★★ · right ✓
A tiger shark is cut open and a number plate is inside. Why is this not so surprising?
- 1. Somebody hid it there as a joke before it was caught — no support
- 2. Tiger sharks collect cars — score 6
- 3. Number plates are its favourite food — no support
- 4. Tiger sharks eat almost anything, rubbish included — ← Mova's choice · ✓ the right answer · score 10
Why: It took the question to ask why something happens (its cause). It chose option 4 with score 10, against 6 for the next best. Its support: lesson 310, line 10: «Tiger sharks eat almost anything, from fish, turtles, sea snakes and birds to rubbish like tyres and number plates, reported; their notched teeth cut turtle sh…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «anything» (+4); the same action «eat» (+3); the same doer «tiger sharks» (+3). · the question and its options parsed, with trees and pragmatics
Test 10 · ★★★ · right ✓
A scientist sees scalloped hammerheads together at noon but alone at midnight. What explains it?
- 1. They school by day and split up at night to hunt alone — ← Mova's choice · ✓ the right answer · score 4
- 2. They are lost at night — no support
- 3. They are two different species — no support
- 4. They sleep together in big groups at midnight — no support
Why: It took the question to ask who or what does it. It chose option 1 with score 4, the only option with support. Its support: lesson 310, line 15: «Scalloped hammerheads gather in big schools by day near underwater mountains, like off the Galápagos, and split up at night to hunt alone; many hammerheads are…», reached through the option's own match among the sentences about the question's things. What matched: the same property (+2); its «because» matches the remembered cause (+2); it fills the role the question asks for (+1). Against it: the same action «split up» (-1). · the question and its options parsed, with trees and pragmatics
Test 11 · ★★★ · wrong ✗
Why might young tiger sharks need stripes more than big old ones?
- 1. Stripes make them swim slower — score 7
- 2. Small sharks have more enemies, and stripes may help them hide — ✓ the right answer · score 7
- 3. Old sharks hate stripes and bite any young shark that has them — ← Mova's choice · score 8
- 4. Stripes keep the water warm — score 6
Why: It took the question to ask why something happens (its cause). It chose option 3 with score 8, against 7 for the next best. Its support: lesson 190, line 10: «The megamouth shark, which lives deep and eats plankton (tiny animals and plants drifting in the sea), was discovered in 1976 off Hawaii, and fewer than three…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «megamouth shark» (+4); the same doer «megamouth shark» (+3); a different action (counts against) (+1). The right option, 2, scored 7. · the question and its options parsed, with trees and pragmatics
Test 12 · ★★★ · right ✓
«why would a shark have its eyes on the ends of a hammer, looks dumb» What is the best answer?
- 1. It uses the hammer to build reefs — no support
- 2. It is a deformity that makes life harder — no support
- 3. Wide-set eyes and sensors help it look around and find buried stingrays — ← Mova's choice · ✓ the right answer · score 5
- 4. Its eyes are only for show — score 2
Why: It took the question to ask why something happens (its cause). It chose option 3 with score 5, against 2 for the next best. Its support: lesson 127, line 10: «Mouse lemurs are among the smallest primates; the smallest weighs about 30 grams, and big eyes help them hunt at night; some sleep through the dry season on fa…», reached through the option's own match among the sentences about the question's things. What matched: the same action «help» (+3); the same doer «big eyes» (+3). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the principal prey of the great white shark.
- 1. Human beings frequenting beaches — ← Mova's choice · no support
- 2. Seaweed and other marine vegetation — no support
- 3. Seals, fish and the carcasses of whales — ✓ the right answer · no support
- 4. Exclusively other species of shark — 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 bull shark?
- 1. It breathes atmospheric air by means of lungs — score 7
- 2. It is capable of inhabiting fresh water as well as the sea — ✓ the right answer · score 9
- 3. It is incapable of surviving outside the deep ocean — score 9
- 4. It is the largest predatory fish in existence — ← Mova's choice · score 11
Why: It took the question to ask who or what does it. It chose option 4 with score 11, against 9 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 remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same light verb (be, have, do, get, go) (+3); the same doer «sharks» (+2); the same thing acted on «fish» (+2). The right option, 2, scored 9. · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · right ✓
Select the response consistent with the established facts concerning the head of the hammerhead shark.
- 1. Its width enables the shark to remain afloat without swimming, in the manner of a raft or a plank — no support
- 2. Its width is a defect that impedes hunting — no support
- 3. Its width serves solely to break the shells of molluscs — no support
- 4. Its width separates the eyes and electrical sensors, assisting the detection of concealed prey — ← Mova's choice · ✓ the right answer · score 5
Why: It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 231, line 2: «We cannot feel these buzzes, but many water animals can. A shark gliding over the sand can feel the heartbeat of a fish hiding underneath, like you finding a f…», reached through the option's own match among the sentences about the question's things. What matched: the same action «find» (+3); the same thing acted on «friend» (+2). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
Ascertain the approximate number of unprovoked bites on human beings attributed to all sharks annually throughout the world.
- 1. Approximately seventy thousand — ← Mova's choice · no support
- 2. Approximately seventy — ✓ the right answer · no support
- 3. Approximately seven hundred thousand — no support
- 4. Approximately seven thousand — 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/310-sharks-by-kind-great-white-tiger-bull-and-hammerhead/