Bones by name: hips, legs and feet, and the extra bones of a baby

Tests: 6 of 11 right · Exam: 2 of 4 right · Kind: ★★ · Understood: 8 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 359 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 ✓

Count them: both feet together have how many bones?

1. 52 — ← Mova's choice · ✓ the right answer · score 7
2. 54 — score 4
3. 26 — score 4
4. 106 — score 4

Why: It took the question to ask what it is done to. It chose option 1 with score 7, against 4 for the next best. Its support: lesson 359, line 9: «Each foot has 26 bones, so both feet have 52; hands and feet together hold over half of all the body's bones.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «feet» (+4); the same light verb (be, have, do, get, go) (+2); it fills the role the question asks for (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · wrong ✗

Count them: both hands have 54 bones and both feet 52. How many bones is that altogether?

1. 206 — ← Mova's choice · no support
2. 106 — ✓ the right answer · no support
3. 96 — no support
4. 108 — 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 ✓

If someone's femur is 40 centimetres long, about how tall are they?

1. About 160 centimetres — ← Mova's choice · ✓ the right answer · no support
2. About 80 centimetres — no support
3. About 40 centimetres — no support
4. About 3 metres — 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 ✓

«baby's got more bones than me? no way, she's tiny» What is right?

1. Yes, and she keeps them all for life — score 3
2. No, babies have no bones at all until they start to walk — score 5
3. Yes, about 270 to 300, and many join as she grows — ← Mova's choice · ✓ the right answer · score 6
4. No, babies have exactly 206 — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 6, against 5 for the next best. Its support: lesson 263, line 2: «A baby has about 300 bones, and many of them join together as it grows, so a grown-up ends up with 206.», reached through the same lesson line as the sentence the question matched. What matched: the same action «join» (+4); its «because» matches the remembered cause (+2). · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · wrong ✗

In a cartoon Tom gets struck by lightning and his skeleton flashes up with just a few stick bones in each leg. How many bones are really in one foot?

1. 10 — ← Mova's choice · no support
2. 26 — ✓ the right answer · no support
3. 1 — 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 6 · ★★ · right ✓

«my toddler cousin's got flat feet, he's gonna need special shoes forever» What is fairest to say?

1. Toddlers usually have flat feet and grow arches later — ← Mova's choice · ✓ the right answer · score 6
2. His feet will never grow arches — score 5
3. He needs surgery at once — no support
4. Flat feet in toddlers are always a disease that needs a doctor straight away — score 0

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 5 for the next best. Its support: lesson 359, line 10: «The arch of the foot works like a spring; toddlers have flat feet and grow arches later, and some people keep flat feet with no problems.», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+4); the same thing acted on «arches» (+1); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · wrong ✗

An X-ray of a 12-year-old shows dark lines near the ends of the leg bones. What are they?

1. Shadows from the X-ray machine — ← Mova's choice · no support
2. Gaps where bones are missing — no support
3. Growth plates where the bones are still growing longer — ✓ the right answer · no support
4. Cracks from a fall — 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 ✗

«I'm 20, if I eat loads I'll keep growing taller» What is the truth?

1. Eating more always makes you taller, at any age, as long as you eat the right food — ← Mova's choice · score 6
2. Once growth plates close in the late teens, bones stop growing longer — ✓ the right answer · no support
3. Only sleep makes adults taller — score 6
4. You grow taller until you are 50 — score -3

Why: It took the question to ask which statement is true. 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 56, line 3: «Here is the big surprise: a tall oak that grew from a tiny acorn is made mostly from the air, because the carbon in carbon dioxide becomes wood, while the soil…», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+4); the same property (+1); a different doer (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 9 · ★★ · right ✓

Why does the heel bone need to be the biggest bone of the foot?

1. It holds all the toes together — score 5
2. It takes the shock of every step and anchors the Achilles tendon — ← Mova's choice · ✓ the right answer · score 9
3. It is the only foot bone with marrow — score 1
4. It has to store fat for walking — no support

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 9, against 5 for the next best. Its support: lesson 359, line 11: «The heel bone is the largest bone of the foot; it takes the shock of each step, and the Achilles tendon attaches to it.», reached through the same lesson line as the sentence the question matched. What matched: the same action «take» (+5); the same thing acted on «shock» (+4). · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · wrong ✗

A boy counts the bones in his little toe on an X-ray and finds two, not three. What should he think?

1. His little toe must be broken and needs a plaster — no support
2. Nothing is wrong; two little-toe bones often fuse — ✓ the right answer · no support
3. He has lost a bone — ← Mova's choice · score 0
4. The X-ray must be fake — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 0, the only option with support. Its support: lesson 302, line 4: «Think of an owl pellet on a classroom table: a ball of fur and tiny bones the owl coughed up, not poo. Pull it apart with tweezers and you can count the skulls…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+2). Against it: a different action (counts against) (-2). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · right ✓

Why might a baby's kneecap be soft cartilage at first?

1. Soft cartilage bends safely while the baby crawls and grows, and turns to bone later — ← Mova's choice · ✓ the right answer · score 9
2. Babies do not need knees — no support
3. The kneecap is missing in babies — score 2
4. Babies' bones are all made of fat — score 1

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 9, against 2 for the next best. Its support: lesson 359, line 6: «The kneecap protects the front of the knee and helps the thigh muscles pull; in babies it is soft cartilage that turns to bone over the first years.», reached through the same lesson line as the sentence the question matched. What matched: the same action «turn» (+5); the same place «bone» (+3); the same doer «soft cartilage» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the longest and strongest bone of the human skeleton.

1. The spinal column — ← Mova's choice · no support
2. The tibia of the shin — no support
3. The humerus — no support
4. The femur — ✓ 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 ✗

State the number of bones comprised in a single human foot.

1. Fifty-two — ← Mova's choice · no support
2. Twenty-seven — no support
3. Five — no support
4. Twenty-six — ✓ 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 3 · formal language · right ✓

Which of the following statements most accurately characterises the diminution in the number of bones between infancy and adulthood?

1. Numerous bones present at birth fuse together in the course of growth — ← Mova's choice · ✓ the right answer · score 8
2. Bones are lost in consequence of the loss of the deciduous teeth — no support
3. Bones are shed from the body in the course of growth — no support
4. Bones are absorbed into the muscles — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 8, the only option with support. Its support: lesson 328, line 12: «Among different kinds of animal, bigger ones usually live longer, so big dogs living shorter lives than small dogs is a puzzle scientists still study.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «bigger ones» (+2); a different action (counts against) (+2). · 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 growth plates.

1. They permit the lengthening of bones and close in the late teens — ← Mova's choice · ✓ the right answer · no support
2. They are situated solely in the skull — no support
3. They remain open throughout life — no support
4. They close at the moment of birth — 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/359-bones-by-name-hips-legs-and-feet-and-the-extra-bones-of-a-baby/