The great apes: chimpanzees, bonobos, gorillas, orangutans

Tests: 7 of 11 right · Exam: 0 of 4 right · Kind: plain · Understood: 9 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 16 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 ✓

In a film, a giant gorilla roars and eats people. What are real gorillas like?

1. Meat eaters that hunt people in villages — no support
2. Mostly gentle plant eaters that beat their chests to avoid fights — ← Mova's choice · ✓ the right answer · score 8
3. Shy animals that never make any noise — no support
4. Fierce hunters that live alone in caves and come out at night to hunt — no support

Why: It took the question to ask what it is done to. It chose option 2 with score 8, the only option with support. Its support: lesson 16, line 2: «A silverback gorilla beating his chest looks terrifying, but he is mostly a gentle vegetarian munching about 18 kilograms of leaves a day, and the chest beat i…», 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 (+4); the same thing acted on «chest» (+3); the same action «beat» (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 2 · right ✓

A silverback is 15 years old. Why has his back turned silver?

1. Males' backs turn silver from about 12 years old — ← Mova's choice · ✓ the right answer · score 7
2. He is very ill — no support
3. He has been rolling in ash — no support
4. Only very old gorillas go silver at 40 — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 7, the only option with support. Its support: lesson 16, line 6: «A silverback is an adult male gorilla whose back turns silver from about 12 years old; he beats his chest with cupped hands, not fists, and the pops can be hea…», reached through the option's own match among the sentences about the question's things. What matched: the same action «turn» (+2); the same doer «back» (+2); the same thing acted on «silver» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 3 · right ✓

Liam says the chest beat is the gorilla punching himself. right?

1. No, he uses cupped hands to make a pop, as a show — ← Mova's choice · ✓ the right answer · no support
2. No, he hits a tree trunk hard with his chest to make it shake — no support
3. Yes, he punches with closed fists — no support
4. Yes, to knock out fleas — 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 · wrong ✗

Why would an orangutan in a zoo enclosure still pile up blankets every evening?

1. It is cold-blooded and must keep itself warm — score 3
2. It is building a house to live in all year — ← Mova's choice · score 6
3. It is hiding its food from the keeper at night — score 1
4. Orangutans build a fresh bed every night — ✓ the right answer · score 5

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 6, against 5 for the next best. Its support: lesson 16, line 8: «Orangutans build a new nest high in the trees every night by bending and weaving branches, sometimes with a pillow or a roof of leaves.», reached through a sentence linked to the one the question matched. What matched: the same action «build» (+3); the same doer «orangutans» (+2); its «because» matches the remembered cause (+2). Against it: a different thing acted on (counts against) (-1). The right option, 4, scored 5. · the question and its options parsed, with trees and pragmatics

Test 5 · right ✓

If someone filmed an orangutan rubbing chewed leaves on a cut, what would that show?

1. Orangutans just like the smell of leaves — no support
2. It was cleaning its own face for fun — score 6
3. Apes can use plants to treat wounds — ← Mova's choice · ✓ the right answer · score 9
4. It was trying to eat the leaves sideways — score 5

Why: It took the question to ask what it is done to. It chose option 3 with score 9, against 6 for the next best. Its support: lesson 16, line 15: «In 2024 scientists in Sumatra reported that an orangutan called Rakus chewed a medicinal plant and spread the juice on a wound on his face, the first wild anim…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «wound» (+3); the same action «treat» (+2). · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

How many legs and arms in a family of 1 mother gorilla and 2 babies?

1. 6 legs and 6 arms — ← Mova's choice · ✓ the right answer · no support
2. 6 legs and 3 arms — no support
3. 4 legs and 4 arms — no support
4. 12 legs and no arms — 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 ✓

why do they say orangutans are in danger, there's loads in zoos innit

1. Wild forests are cut down and apes breed slowly, so wild numbers fall — ← Mova's choice · ✓ the right answer · score 5
2. Zoos keep taking all of them out of the forests to put on show — no support
3. They are not in danger at all — no support
4. They catch colds from tourists — 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 16, line 4: «Orangutans live in Borneo and Sumatra, gorillas, chimps and bonobos in Africa, and their forests are being cut down for farms and oil palm, while apes have bab…», reached through the same lesson line as the sentence the question matched. What matched: the same action «cut down» (+3); the same thing acted on «forests» (+2). · the question and its options parsed, with trees and pragmatics

Test 8 · wrong ✗

A dog barks at itself in the mirror. A chimp touches a mark on its own face. What does that tell us?

1. The dog is cleverer than the chimp — no support
2. The chimp knows the reflection is itself; the dog does not seem to — ✓ the right answer · no support
3. Both know it is themselves — ← Mova's choice · score 3
4. Neither can see mirrors — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 3, the only option with support. Its support: lesson 16, line 13: «In the mirror test, chimpanzees, bonobos and orangutans touch a mark put on their face, showing they know the reflection is themselves; most animals, like cats…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+3); the same thing acted on «mark» (+1). Against it: 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 9 · wrong ✗

Why do scientists photograph gorillas' noses instead of putting tags on them?

1. Their noses tell their age — no support
2. Tags fall off in the rain — no support
3. Each nose wrinkle pattern is unique, so no catching is needed — ✓ the right answer · no support
4. Gorillas love having their picture taken and pose for the cameras — ← Mova's choice · score 3

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 3, the only option with support. Its support: lesson 16, line 14: «Every gorilla has its own pattern of nose wrinkles, like a fingerprint, so scientists can recognise each one from photos without catching it.», reached through the cause of the sentence the question matched. What matched: the same doer «gorilla» (+3). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

What would happen to orangutan numbers if a forest is cut and only a few mothers survive?

1. They would grow back from seeds — no support
2. Numbers would recover very slowly, as each baby takes about 8 years — ← Mova's choice · ✓ the right answer · score 4
3. They would recover in one summer, as orangutans have many babies at once — score 4
4. They would double every year — no support

Why: It took the question to ask what happens next. It chose option 2 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 16, line 4: «Orangutans live in Borneo and Sumatra, gorillas, chimps and bonobos in Africa, and their forests are being cut down for farms and oil palm, while apes have bab…», reached through the same lesson line as the sentence the question matched. What matched: the same action «recover» (+2); the same doer «numbers» (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

My sister thinks a chimp eats only bananas. What is true?

1. Chimps eat only grass — no support
2. Chimps eat only bananas, which they pick from the wild banana trees — ← Mova's choice · score 0
3. Chimps eat mostly fruit, but also termites and sometimes monkeys — ✓ the right answer · no support
4. Chimps eat only meat — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 0, the only option with support. Its support: lesson 15, line 5: «A gorilla is not a monkey at all: apes have no tail; and the cartoon monkey with a banana is wrong too, because wild monkeys never ate our sweet shop bananas.», reached through the remembered sentence the question matched. What matched: the same action «eat» (+4); the same thing acted on «sweet shop bananas» (+4). Against it: a different doer (counts against) (-2); one says «not», the other does not (counts against) (-6). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal significance of the observation made by Jane Goodall at Gombe in 1960.

1. It established that termites cultivate chimpanzees — ← Mova's choice · no support
2. It demonstrated that animals other than humans manufacture tools — ✓ the right answer · no support
3. It demonstrated that gorillas consume meat habitually — no support
4. It demonstrated that chimpanzees are incapable of using tools — 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 diet of the gorilla?

1. It is composed principally of the flesh of other primates — ← Mova's choice · no support
2. It is composed predominantly of insects — no support
3. It is almost entirely composed of vegetable matter — ✓ the right answer · no support
4. It consists exclusively of fish — 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 · wrong ✗

Ascertain the approximate duration for which a young orangutan remains in the company of its mother.

1. Approximately seven to eight weeks — ← Mova's choice · no support
2. Approximately one year — no support
3. Approximately thirty years — no support
4. Approximately seven to eight years — ✓ the right answer · 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

Exam question 4 · formal language · wrong ✗

Select the response consistent with the established facts concerning the conservation status of the great apes.

1. No great ape has ever been considered at risk of extinction — ← Mova's choice · no support
2. Every species of great ape is presently endangered — ✓ the right answer · no support
3. The great apes are abundant throughout every continent — no support
4. Only gorillas are presently considered to be at risk — 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

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