Whales by kind, the toothed whales: sperm whale, orca, beluga and beaked whales

Tests: 5 of 11 right · Exam: 1 of 4 right · Kind: ★ · Understood: 12 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 313 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 sperm whale has 50 teeth in its lower jaw. How many in its upper jaw?

1. 25, half as many as below — ← Mova's choice · no support
2. 100, twice as many, in two rows — no support
3. 50, the same as below — no support
4. None; the upper jaw only has sockets — ✓ 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

Test 2 · ★ · wrong ✗

Count them: a male strap-toothed whale and a male with four teeth meet. How many teeth do they have together?

1. 4 — ← Mova's choice · score 0
2. 2 — score 0
3. 8 — score 0
4. 6 — ✓ the right answer · score 0

Why: It took the question to ask what it is done to. It chose option 1 with score 0, tied with another option at 0 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 160, line 2: «In its roaring rapids the goliath tigerfish hunts with long dagger teeth that fit together like a trap, and it can grow as big as a large child.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+1). Against it: the same doer «long dagger teeth» (-1). The right option, 4, scored 0. · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · right ✓

Count them: 2 sperm whales and 3 belugas surface. All are toothed whales. How many blowholes do you see?

1. 5 — ← Mova's choice · ✓ the right answer · no support
2. 10 — no support
3. 3 — no support
4. 7 — 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 Free Willy an orca is called a killer whale and the people are scared of it. What is true?

1. Orcas hunt people every day in every ocean — score 0
2. No wild orca is confirmed to have killed a person, and it is really a dolphin — ← Mova's choice · ✓ the right answer · score 5
3. Orcas are small baleen whales that eat krill — score 2
4. Orcas are a kind of shark — score 3

Why: It took the question to ask which statement is true. It chose option 2 with score 5, against 3 for the next best. Its support: lesson 313, line 11: «There are no confirmed cases of wild orcas killing a person.», reached through the option's own match among the sentences about the question's things. What matched: the same action «kill» (+3); the same thing acted on «person» (+2). · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · wrong ✗

«lol just found a smelly waxy lump on the beach, can i sell it» What should you know?

1. It is a sperm whale's egg — no support
2. It is a lump of whale poo with real gold hidden inside it — ← Mova's choice · score -2
3. It might be ambergris; some countries ban selling it to protect whales — ✓ the right answer · no support
4. It is always plastic, throw it back in the sea — no support

Why: It took the question to ask what it is done to. It chose option 2 with score -2, the only option with support. Its support: lesson 313, line 9: «Ambergris is a waxy lump that forms in a sperm whale's gut around hard squid beaks and can wash ashore; it was used in perfume for hundreds of years, and some…», reached through the option's own match among the sentences about the question's things. Against it: the same doer «waxy lump» (-1); the same thing acted on «waxy lump» (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · right ✓

What would happen if a sleeping sperm whale sank too deep to reach the air?

1. It would float up by itself, with no need for any air — score 1
2. It would breathe through its gills — score 1
3. It would sleep on the seabed for a year — score 1
4. It would have to wake and swim up to breathe — ← Mova's choice · ✓ the right answer · score 3

Why: It took the question to ask what happens next. It chose option 4 with score 3, against 1 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 what followed the sentence the question matched. What matched: the same light verb (be, have, do, get, go) (+2); the same doer «whales» (+1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · wrong ✗

A mate says the orcas biting boats off Spain must be angry for revenge. What do scientists say?

1. They are trying to steal the fish — ← Mova's choice · score 12
2. They think the boats are seals — score 1
3. They are certainly angry at one boat that hurt them — no support
4. They are not sure why; it may be play or a fashion copied between orcas — ✓ the right answer · score 1

Why: It took the question to ask what it is done to. It chose option 1 with score 12, against 1 for the next best. Its support: lesson 264, line 4: «A good experiment is a fair test that changes only one thing at a time, and good scientists repeat it, try to prove their own ideas wrong, and are not ashamed…», reached through the same lesson line as the sentence the question matched. What matched: the same action «try» (+8); the same doer «good scientists» (+4). The right option, 4, scored 1. · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

«why do sperm whales have scars like circles all over» What is the best answer?

1. They are marks from the suckers of squid they hunt — ← Mova's choice · ✓ the right answer · score 8
2. They are from whale lice nibbling at their skin — no support
3. They are bite marks from sharks only — no support
4. They are sunburn spots — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 8, the only option with support. Its support: lesson 39, line 16: «Sperm whales dive deep to hunt giant squid, and many sperm whales carry round scars left by the squid's suckers.», reached through the same lesson line as the sentence the question matched. What matched: the same action «hunt» (+3); the same doer «sperm whales» (+3); the same thing acted on «giant squid» (+2). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

Why would a whale that hunts in the black deep need very loud clicks?

1. To keep itself warm — ← Mova's choice · score 6
2. To find prey by echoes where there is no light — ✓ the right answer · score 6
3. To call sea birds down to help it hunt — score 6
4. To scare away the light — score 6

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 313, line 1: «Toothed whales hunt one animal at a time instead of sieving the sea. They have one blowhole, and most find their food by sending out clicks and listening for t…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «one animal» (+3); the same doer «toothed whales» (+2); a different action (counts against) (+1). The right option, 2, scored 6. · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · wrong ✗

In a cartoon a whale bends its neck to look behind it like a person. Which real whale comes closest?

1. The sperm whale, which has a long neck — ← Mova's choice · score 2
2. No whale; all whales have no neck bones — score -1
3. The blue whale, which can turn its head right round — score -1
4. The beluga, whose neck bones are not joined — ✓ the right answer · score -2

Why: It took the question to ask what it is done to. It chose option 1 with score 2, against -1 for the next best. Its support: lesson 278, line 6: «In 1809 Jean-Baptiste Lamarck suggested that animals pass on body changes they gained by using them, such as a stretched neck; this is wrong, because stretchin…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+2). The right option, 4, scored -2. · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

«the beluga's head changes shape?? creepy» What is happening?

1. Its melon changes shape as it makes sounds — ← Mova's choice · ✓ the right answer · score 9
2. It is storing extra food in its soft forehead — score 0
3. Its skull is broken — score 0
4. It is breathing through its forehead — score 0

Why: It took the question to ask what happens next. It chose option 1 with score 9, against 0 for the next best. Its support: lesson 313, line 14: «The beluga's bulgy forehead, the melon, changes shape as it makes sounds, and its seven neck bones are not joined together, so it can nod and turn its head.», reached through what followed the sentence the question matched. What matched: the same action «make» (+6); the same thing acted on «sounds» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal prey of the sperm whale and the depth at which it is pursued.

1. Krill, filtered at depths of a few metres — ← Mova's choice · no support
2. Squid, pursued at depths in excess of two kilometres — ✓ the right answer · no support
3. Seaweed, gathered from the shallows — no support
4. Seals, captured upon the surface of the Arctic ice — 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 orca.

1. It is a species of shark which feeds exclusively upon persons — no support
2. It is a baleen whale which feeds solely upon krill — score 2
3. It is a seal which hunts beneath the Arctic ice and breathes through holes it keeps open — no support
4. It is the largest member of the dolphin family and its populations differ in diet — ← Mova's choice · ✓ the right answer · score 6

Why: It took the question to ask which statement is true. It chose option 4 with score 6, against 2 for the next best. Its support: lesson 313, line 10: «The orca, or killer whale, is the biggest member of the dolphin family; different groups eat different food, some only fish, others seals or even other whales.», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+3); the same thing acted on «biggest member» (+2); the same light verb (be, have, do, get, go) (+2). Against it: the same doer «orca» (-1). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Which of the following statements most accurately characterises the beluga?

1. An Arctic whale whose unfused cervical vertebrae permit the head to turn — ✓ the right answer · score 2
2. A tropical whale whose neck is wholly absent — ← Mova's choice · score 3
3. A deep-sea fish whose forehead emits light — no support
4. A whale of the Antarctic which lacks a blowhole and respires through the skin — score 2

Why: It took the question to ask who or what does it. It chose option 2 with score 3, against 2 for the next best. Its support: lesson 296, line 10: «Whales strand on beaches for many reasons, such as sickness, loud noise, confusing coastlines or a group following its leader; rescuers keep them wet and cool…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+2); the same doer «whales» (+1). The right option, 1, scored 2. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Ascertain the reason for which certain species of beaked whale are known principally from stranded carcasses.

1. They became extinct before the invention of boats — no support
2. They inhabit freshwater lakes inaccessible to scientists — ← Mova's choice · score 2
3. They dwell far from shore and dive to great depths, and are therefore rarely observed alive — ✓ the right answer · score 2
4. They emerge from the sea only at night — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 285, line 15: «Apps let children record the animals and plants they see; their photos let experts check what each animal really is and help scientists map where species live.», reached through the option's own match among the sentences about the question's things. What matched: the same action «live» (+3). Against it: the same doer «species» (-1). The right option, 3, scored 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/313-whales-by-kind-the-toothed-whales-sperm-whale-orca-beluga-and-beaked-whales/