The brain and nerves

Tests: 6 of 12 right · Exam: 1 of 4 right · Kind: ★★★ · Understood: 6 of 16 · Run: 2026-10-18, commit f3c23ea72

Lesson 68 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 ✓

lol my brother says he only uses 10% of his brain. what about the rest?

1. Myth: we use all of it, just not every part at once — ← Mova's choice · ✓ the right answer · no support
2. True, the rest is just water — no support
3. True, the rest is spare and gets switched on when he is older — no support
4. True, the rest only works at night — 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 a cartoon the hero bumps his head and the brain inside rattles but nothing happens. Why do real people wear helmets?

1. Brains cannot be hurt by bumps, helmets are only for show — no support
2. A hard knock can bang the brain against the skull and hurt it — ← Mova's choice · ✓ the right answer · score 4
3. Helmets are really only for keeping warm in winter — no support
4. Helmets help you think faster on the road — no support

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 4, the only option with support. Its support: lesson 68, line 8: «A helmet's foam crushes when it hits something, slowing the head down more gently so the brain is not knocked so hard against the skull.», reached through a sentence linked to the one the question matched. What matched: the same thing acted on «brain» (+3); the same place «skull» (+2). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★★ · wrong ✗

What would happen if a nerve from the hand to the spinal cord were cut?

1. The brain would stop getting touch signals from that hand — ✓ the right answer · no support
2. The hand would slowly grow a little brain of its own to make up for it — no support
3. The hand would feel everything twice as strongly — ← Mova's choice · score 0
4. Nothing, hands do not need nerves — no support

Why: It took the question to ask what happens next. It chose option 3 with score 0, the only option with support. Its support: lesson 59, line 13: «A fruit is the part of a plant that grows from the flower and holds the seeds, so tomatoes, peppers, cucumbers and pea pods are fruits to a scientist, though c…», reached through what followed the sentence the question matched. What matched: the same action «find» (+4). Against it: a different doer (counts against) (-2); a different thing acted on (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 4 · ★★★ · wrong ✗

A girl's leg stays still when the doctor taps her knee, even though she is relaxed. What might the doctor think?

1. Her knee is too strong for the little hammer — ← Mova's choice · no support
2. Her leg has gone to sleep forever — no support
3. She has far too much brain power and it stops the kick — no support
4. The reflex path through her spinal cord may not be working well — ✓ 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 5 · ★★★ · wrong ✗

Jake says left-brained people are good at maths and right-brained people at art. Right?

1. No, artists use only their spinal cord — ← Mova's choice · no support
2. Yes, and they can never change sides — no support
3. No, that is a myth; both halves work together in everyone — ✓ the right answer · no support
4. Yes, each person only ever uses one half of the brain at a time — 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 6 · ★★★ · right ✓

Why might a stubbed toe give a quick bump first and the real ache a moment later?

1. Different nerve signals travel at different speeds — ← Mova's choice · ✓ the right answer · score 6
2. The brain waits to decide if it cares — no support
3. The toe sends two letters to the brain by post, one after the other — no support
4. The ache has to go round the body twice — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, the only option with support. Its support: lesson 68, line 3: «Stub your toe and there is a strange gap: first a bump, then a moment later the ache arrives and you yell, because the signal has to travel all the way up your…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «signal» (+4); the same action «travel» (+2). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★★ · wrong ✗

Ben slept badly before his spelling test and forgot words he knew. Why?

1. Spelling is stored in the stomach — ← Mova's choice · no support
2. Sleep makes the brain smaller so words fit better — no support
3. Sleep helps the brain sort and store memories — ✓ the right answer · no support
4. Words fall out of the ears at night — 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 8 · ★★★ · wrong ✗

argh ice cream headache. how do i stop it??

1. Stand on your head till it goes — ← Mova's choice · no support
2. Slow down and warm the roof of your mouth, it soon passes — ✓ the right answer · no support
3. Eat more ice cream even faster to freeze the headache out — no support
4. It lasts all day and nothing helps — 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 9 · ★★★ · right ✓

An octopus at the aquarium opens a jar with its arms while its eyes look elsewhere. How can its arms be so clever?

1. The octopus has tiny eyes on its arm tips — score 4
2. Most of its nerve cells are in its arms, which can act partly on their own — ← Mova's choice · ✓ the right answer · score 12
3. It is trained by a robot in the tank — no support
4. Each arm has a full second brain just like ours, so it has eight extra brains — no support

Why: It took the question to ask what something is like. It chose option 2 with score 12, against 4 for the next best. Its support: lesson 68, line 18: «An octopus has about 500 million nerve cells, and about two thirds of them are in its eight arms, which can taste and feel and act partly on their own.», reached through the option's own match among the sentences about the question's things. What matched: the same action «act» (+5); the same doer «eight arms» (+4); the same place «own» (+3); it fills the role the question asks for (+1). Against it: the same property (-1). · the question and its options parsed, with trees and pragmatics

Test 10 · ★★★ · right ✓

In a film a robot says the brain is like a computer that is off while you sleep. What is wrong?

1. The brain stays busy in sleep, sorting memories and making dreams — ← Mova's choice · ✓ the right answer · score 5
2. The brain is only off at weekends — no support
3. The brain is on only in REM sleep — no support
4. Nothing is wrong, the brain really is switched off every night — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 5, the only option with support. Its support: lesson 68, line 13: «During sleep the brain is busy: it sorts and stores the day's memories, clears away waste and helps the body grow and repair.», reached through the remembered sentence the question matched. What matched: the same property (+3); the same doer «brain» (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · ★★★ · right ✓

Why would a doctor worry much more about a broken back than a broken arm?

1. The spinal cord inside the back carries messages to the whole body — ← Mova's choice · ✓ the right answer · no support
2. Backs can never heal once broken — no support
3. The back is much heavier than the arm, so it is harder to lift — no support
4. The arm has no bones in it — 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 12 · ★★★ · wrong ✗

You cross your legs for an hour and your foot goes numb, then tingles. What does the tingle mean?

1. The bone in the foot is growing — ← Mova's choice · no support
2. The blood has turned into fizz — no support
3. The foot is freezing because the blood stopped for an hour — no support
4. The squashed nerve is waking up and sending signals again — ✓ 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

Exam question 1 · formal language · wrong ✗

Identify the pathway by which the knee-jerk reflex is effected.

1. Via the brain, following a deliberate decision to move the leg — ← Mova's choice · no support
2. Via the bloodstream from the heart — no support
3. Via the skin of the knee alone — no support
4. Via the spinal cord directly to the muscle, without the brain — ✓ 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

Exam question 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the control of the body by the cerebral hemispheres?

1. Each hemisphere principally governs the same side of the body — ← Mova's choice · no support
2. Each hemisphere principally governs the opposite side of the body — ✓ the right answer · no support
3. The hemispheres govern no movement whatever — no support
4. The left hemisphere alone governs movement — 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 3 · formal language · right ✓

It is asserted that human beings employ merely ten percent of the brain. Select the response consistent with the established facts.

1. The assertion is false; all regions are employed, though not at once — ← Mova's choice · ✓ the right answer · no support
2. The assertion is correct for adults but not for children — no support
3. The assertion is correct during sleep alone — no support
4. The assertion is correct for the left hemisphere — 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 · wrong ✗

Ascertain the principal means by which a protective helmet reduces injury to the brain upon impact.

1. It cools the brain upon impact — ← Mova's choice · score 2
2. It prevents the head from moving at all — no support
3. It renders the skull permanently thicker after each impact — no support
4. Its foam deforms, decelerating the head more gradually — ✓ the right answer · no support

Why: It took the question to ask which statement is true. It chose option 1 with score 2, the only option with support. Its support: lesson 66, line 15: «Nobody knows for sure why we yawn; one idea is that it helps cool the brain, and yawns are catching, so seeing someone yawn often makes you yawn.», reached through the option's own match among the sentences about the question's things. What matched: the same action «cool» (+2); the same thing acted on «brain» (+1). Against it: a different doer (counts against) (-1). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/68-the-brain-and-nerves/