The polar zone: polar bears

Tests: 8 of 11 right · Exam: 4 of 4 right · Kind: ★ · Understood: 11 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 105 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 ✗

In a fizzy drink advert polar bears sip cola on the ice. What is real?

1. Polar bears drink seawater like whales — ← Mova's choice · score 8
2. Polar bears drink very little and get water from seal fat — ✓ the right answer · score 8
3. Polar bears drink lots of fresh water from the lakes every day — score 8
4. Polar bears need sweet drinks for energy — score 2

Why: It took the question to ask which statement is true. It chose option 1 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 105, line 4: «Adverts show polar bears sipping fizzy drinks and cartoons put them next to penguins, but real polar bears hardly drink at all and live in the Arctic, at the o…», reached through the same lesson line as the sentence the question matched. What matched: the same action «drink» (+4); the same doer «real polar bears» (+4). The right option, 2, scored 8. · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · right ✓

A cartoon shows a polar bear chatting with penguins on the ice. What is wrong?

1. Polar bears are far too shy to go anywhere near penguins on the ice — score 4
2. Wild polar bears live in the Arctic and wild penguins in the south — ← Mova's choice · ✓ the right answer · score 7
3. Penguins are too fast for polar bears — score 7
4. Nothing, they live together in Antarctica — score 2

Why: It took the question to ask which statement is true. It chose option 2 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 7, line 4: «Christmas cards love polar bears and penguins playing together, but they never meet: polar bears live in the Arctic in the north, penguins almost only in the s…», reached through the option's own match among the sentences about the question's things. What matched: the same place «arctic» (+3); the same action «live» (+2); the same doer «polar bears» (+1); the same circumstance (+1). · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · right ✓

«polar bears are white all over, even the skin, right» What is true?

1. Yes, white skin and white hair — no support
2. The skin is black, and the clear hairs only look white — ← Mova's choice · ✓ the right answer · score 8
3. No, the skin is green from algae — no support
4. No, the skin is pink like a pig's — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 8, the only option with support. Its support: lesson 6, line 6: «Polar bears hunt seals from the sea ice and swim well, kept warm by fat up to about 10 cm thick; their skin is black and their hairs are see-through, only look…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «skin» (+4); the same property (+3); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 4 · ★ · right ✓

A mother polar bear has 2 cubs. How many paws do the three of them have?

1. 12 — ← Mova's choice · ✓ the right answer · no support
2. 8 — no support
3. 6 — no support
4. 16 — 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 · ★ · wrong ✗

What would happen to polar bears if the sea ice melted much earlier every year?

1. Nothing, they mostly eat berries — score 2
2. They would hunt seals much more easily in the open summer water — ← Mova's choice · score 6
3. They would all swim south and move to Antarctica — score 2
4. They would have less time to hunt seals and go hungry longer — ✓ the right answer · score 6

Why: It took the question to ask what happens next. 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 105, line 9: «Arctic sea ice now melts earlier and freezes later as the climate warms, so polar bears have less time to hunt seals, though they can go months without eating…», reached through the same lesson line as the sentence the question matched. What matched: the same action «hunt» (+2); the same doer «polar bears» (+2); the same thing acted on «seals» (+2). The right option, 4, scored 6. · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · wrong ✗

«aww the cub's tiny, bet it's born big as a dog» What is right?

1. No, they hatch from eggs in the snow — ← Mova's choice · no support
2. Yes, they are born about the size of a big dog, with open eyes — no support
3. Yes, and they can swim from the first day — no support
4. Newborn cubs weigh less than a kilogram and are blind — ✓ 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 7 · ★ · right ✓

«bloody hell, a polar bear in town, let's go take a selfie» What should people do?

1. Throw it food so it stays calm — score 3
2. Stay away and call the bear patrol — ← Mova's choice · ✓ the right answer · score 6
3. Go close, but keep very quiet — score 6
4. Stroke it gently from behind — no support

Why: It took the question to ask what is done. 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 105, line 10: «Polar bears are the largest meat-eaters on land and may see people as food, and the Canadian town of Churchill has a bear patrol that people call instead of go…», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same action «call» (+2); the same thing acted on «bear patrol» (+1). · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

A «pizzly» bear was seen in Canada. What is it?

1. A polar bear with green algae in its fur — score 4
2. A new kind of panda — score 4
3. A pizza-eating zoo bear — score 6
4. A cub of a polar bear and a grizzly — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask what it is done to. It chose option 4 with score 8, against 6 for the next best. Its support: lesson 105, line 13: «Polar bears evolved from brown bears, scientists think a few hundred thousand years ago, and polar bears and grizzlies have met in Canada and had «pizzly» cubs.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «polar bears» (+3); it fills the role the question asks for (+3); the same thing acted on «pizzly cubs» (+2). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · right ✓

3 polar bears and 2 brown bears in a documentary. How many tails?

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

Why might a polar bear in summer roll in the snow?

1. To clean its fur — ← Mova's choice · ✓ the right answer · no support
2. To cool down after eating a big heavy meal — no support
3. To make its fur grow longer — no support
4. To hide from seals — 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 11 · ★ · right ✓

A polar bear walks on slippery ice without falling. How?

1. It never walks on ice, only snow — score 2
2. Fur and small bumps on its soles grip the ice — ← Mova's choice · ✓ the right answer · score 5
3. It has metal-like claws only — no support
4. It slides on purpose and enjoys it — 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 105, line 12: «The soles of a polar bear's paws have fur and small bumps that grip the ice and keep the feet warm.», reached through the option's own match among the sentences about the question's things. What matched: the same action «grip» (+2); the same thing acted on «ice» (+2); the same doer «small bumps» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Which of the following statements most accurately characterises the fur and skin of the polar bear?

1. The hairs are white and the skin is pink — score 6
2. The hairs contain a white colouring, and the skin beneath them is likewise white — score 5
3. The hairs are black and appear white owing to frost — score 8
4. The hairs are transparent and hollow, appearing white by scattering light, and the skin beneath is black — ← Mova's choice · ✓ the right answer · score 10

Why: It took the question to ask who or what does it. It chose option 4 with score 10, against 8 for the next best. Its support: lesson 105, line 6: «Polar bear hairs are clear and hollow and look white because they scatter light; the skin underneath is black, and in some warm zoos tiny algae growing inside…», 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 «look» (+2); the same doer «polar bear hairs» (+2); its «because» matches the remembered cause (+2). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Identify the principal consequence for the polar bear of the earlier melting and later freezing of Arctic sea ice.

1. No consequence, the species feeding chiefly upon vegetation — no support
2. A migration of the species to the Antarctic — no support
3. A shorter period in which to hunt seals and longer intervals without food — ← Mova's choice · ✓ the right answer · score 5
4. An abundance of seals in open water, rendering hunting easier than before — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 5, the only option with support. Its support: lesson 105, line 9: «Arctic sea ice now melts earlier and freezes later as the climate warms, so polar bears have less time to hunt seals, though they can go months without eating…», reached through the same lesson line as the sentence the question matched. What matched: the same action «hunt» (+4); the same thing acted on «seals» (+1). · 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 source of water for the polar bear.

1. It drinks fresh water from frozen lakes and rivers throughout the year — no support
2. It obtains the greater part of its water from breaking down seal fat — ← Mova's choice · ✓ the right answer · score 5
3. It requires sweetened liquids supplied by man — no support
4. It drinks seawater in considerable quantities daily — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 105, line 15: «Polar bears drink very little: seawater is too salty and fresh water is frozen most of the year, so they get most of their water from breaking down the fat of…», reached through the same lesson line as the sentence the question matched. What matched: the same action «break down» (+4); the same thing acted on «fat» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

State the ancestry of the polar bear as presently understood by scientists.

1. It evolved from the giant panda in the recent past — no support
2. It descends from the seal upon which it now preys, some millions of years ago — no support
3. It has existed unchanged since the age of the dinosaurs — no support
4. It evolved from the brown bear, probably a few hundred thousand years ago — ← 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 105, line 13: «Polar bears evolved from brown bears, scientists think a few hundred thousand years ago, and polar bears and grizzlies have met in Canada and had «pizzly» cubs.», reached through a sentence linked to the one the question matched. What matched: the same action «evolve» (+2); the same circumstance (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/105-the-polar-zone-polar-bears/