The Congo rainforest: gorillas, bonobos, okapis and forest elephants

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

Lesson 159 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 ✓

King Kong roars, thumps his chest with his fists and smashes a city. What is true of real gorillas?

1. Gorillas eat people — score 2
2. Gorillas cannot beat their chests at all; that is only in films — score 3
3. Gorillas smash anything they meet — no support
4. They are mostly calm plant-eaters; chest-beating with cupped hands is a show, not an attack — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 3 for the next best. Its support: lesson 159, line 3: «Cartoon gorillas like King Kong thump their chests with fists, roar and smash things; real gorillas are mostly calm plant-eaters, and chest-beating is a show,…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «real gorillas» (+3); the same property (+3); the same thing acted on «calm plant eaters» (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · right ✓

«bonobos are just chimps with a different name» What is right?

1. They are a separate kind that lives south of the Congo River and solves many quarrels peacefully — ← Mova's choice · ✓ the right answer · score 5
2. Bonobos are a kind of gorilla — score 5
3. Yes, exactly the same animal — no support
4. Bonobos are small monkeys with tails that live up in the trees — score 4

Why: It took the question to ask which statement is true. It chose option 1 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 85, line 11: «Bonobos are a separate kind of ape, slimmer than chimpanzees, and live only in the Democratic Republic of the Congo, south of the Congo River, while chimps liv…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «separate kind» (+3); the same light verb (be, have, do, get, go) (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · wrong ✗

«look, a zebra with a giraffe's head!» What animal is it?

1. A young zebra — ← Mova's choice · no support
2. An okapi, the giraffe's closest relative — ✓ the right answer · no support
3. A striped antelope — no support
4. A mix of a zebra and a giraffe, born on a farm — 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 ✗

Two gorillas and one okapi meet in a clearing. How many legs, not counting the gorillas' arms?

1. 6 — ← Mova's choice · score 3
2. 12 — score 3
3. 8 — ✓ the right answer · score 3
4. 10 — score 3

Why: It took the question to ask what it is done to. It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 40, line 16: «A woodlouse has 14 legs and is a crustacean, related to crabs; a crab has ten legs counting its claws, which is why it is called a decapod.», reached through the option's own match among the sentences about the question's things. What matched: the same action «count» (+4); the same doer «ten legs» (+2). Against it: one says «not», the other does not (counts against) (-3). The right option, 3, scored 3. · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · wrong ✗

Three forest elephants walk past. How many trunks and how many tusks, if each has two?

1. 3 trunks and 12 tusks — ← Mova's choice · score 3
2. 6 trunks and 3 tusks — score 3
3. 3 trunks and 6 tusks — ✓ the right answer · score 3
4. 3 trunks and 3 tusks — score 3

Why: It took the question to ask what it is done to. It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 149, line 3: «Mice do not crawl up elephant trunks either: the trunk is a mighty muscular nose that blows dust and water over the elephant's back and could snort out any int…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «trunk» (+2); it fills the role the question asks for (+1). The right option, 3, scored 3. · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · right ✓

What would happen to many big trees if forest elephants disappeared?

1. Their seeds would be spread much less, so fewer new trees would grow — ← Mova's choice · ✓ the right answer · score 1
2. They would spread seeds by walking — score 1
3. Nothing would change — no support
4. They would grow faster without elephants walking about and eating their fruit — score 0

Why: It took the question to ask what happens next. It chose option 1 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 159, line 11: «African forest elephants are smaller than savanna elephants, with straighter tusks that point down, and they spread the seeds of many big trees.», reached through the option's own match among the sentences about the question's things. What matched: the same action «spread» (+1); the same thing acted on «seeds» (+1). Against it: the same doer «elephants» (-1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · right ✓

«my mate's parrot says hello, so it understands english» What is the best answer?

1. No, parrots cannot copy sounds — score 3
2. Most parrots copy sounds, though Alex the grey parrot showed some can learn names, colours and numbers — ← Mova's choice · ✓ the right answer · score 5
3. Yes, every parrot can speak like a person and understands every word it says — score 1
4. Parrots only copy cats — 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 139, line 12: «Many parrots copy words and sounds such as phones and doorbells, the way wild parrots copy their flock's calls; an African grey called Alex learned to name ove…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «words» (+3); the same action «copy» (+2). · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

Two chimp groups use tools in different ways. What does that show?

1. Chimp groups have their own traditions learned from others — ← Mova's choice · ✓ the right answer · no support
2. The chimps are copying whatever the scientists show them to do with sticks — no support
3. Tools grow differently in each area — no support
4. One group is clever and the other is not — 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 ✓

A pangolin has no teeth. How does it eat?

1. It licks up ants and termites with a very long tongue — ← Mova's choice · ✓ the right answer · score 9
2. It drinks only water — no support
3. It swallows fruit whole — no support
4. It eats only soft young leaves from the tops of the trees — no support

Why: It took the question to ask what something is like. It chose option 1 with score 9, the only option with support. Its support: lesson 159, line 12: «The pangolin is covered in hard overlapping scales made of keratin, like fingernails, has no teeth, and licks up ants and termites with a very long tongue.», reached through the same lesson line as the sentence the question matched. What matched: the same circumstance (+4); the same thing acted on «ants» (+3); the same action «lick up» (+2). · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · right ✓

A snail the size of a fist crawls over a log. How does it eat leaves with no jaws like ours?

1. It soaks them in water — score 1
2. It does not eat at all — score 2
3. It scrapes them with thousands of tiny teeth on its radula — ← Mova's choice · ✓ the right answer · score 8
4. It sucks them through a straw — score 1

Why: It took the question to ask what something is like. It chose option 3 with score 8, against 2 for the next best. Its support: lesson 159, line 16: «Giant African land snails can grow shells longer than a child's hand and have thousands of tiny teeth on a ribbon called a radula.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «giant african land snails» (+3); the same circumstance (+3); the same place «ribbon» (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

«leopards only hunt at night, so the forest's safe at noon» What is right?

1. Leopards only ever hunt out on the open savanna, never among trees — no support
2. Yes, they sleep all day — score 1
3. Leopards never live in forests — score 1
4. In the dark rainforest leopards often hunt by day too — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 1 for the next best. Its support: lesson 20, line 12: «Cheetahs have dark tear lines from eyes to mouth that may cut the glare of the sun, and they hunt in the day, while most big cats hunt at night.», reached through the same lesson line as the sentence the question matched. What matched: the same action «hunt» (+5); the same property (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Select the response consistent with the established facts concerning the chest-beating of the male gorilla.

1. It invariably precedes an attack upon a human being — ← Mova's choice · score 4
2. It is a symptom of illness — no support
3. It is performed with closed fists in order to inflict injury upon the rival male — no support
4. It is a display communicating size and strength, frequently obviating actual combat — ✓ the right answer · no support

Why: It took the question to ask which statement is true. It chose option 1 with score 4, the only option with support. Its support: lesson 159, line 3: «Cartoon gorillas like King Kong thump their chests with fists, roar and smash things; real gorillas are mostly calm plant-eaters, and chest-beating is a show,…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «chest beating» (+3); the same thing acted on «show» (+1). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Identify the principal circumstance that led to the separation of chimpanzees and bonobos into distinct species.

1. The formation of the Congo River as a barrier which their ancestors could not cross — ← Mova's choice · ✓ the right answer · no support
2. The extinction of the gorilla within the region — no support
3. The deliberate breeding of the two forms by human beings — no support
4. The migration of the bonobo to the mountains of East Africa, far from the river — 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 okapi?

1. It is the closest living relative of the giraffe and inhabits only the Congo forest — ← Mova's choice · ✓ the right answer · score 6
2. It is a hybrid of the zebra and the giraffe — no support
3. It is a juvenile zebra of a forest variety — no support
4. It is a species of antelope inhabiting the open savanna of East and Southern Africa — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 6, the only option with support. Its support: lesson 159, line 9: «The okapi lives only in the Congo forest and is the giraffe's closest living relative; its stripy legs break up its outline in the shadows.», reached through the option's own match among the sentences about the question's things. What matched: the same action «live» (+3); it fills the role the question asks for (+2); the same doer «okapi» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Given that each of four forest elephants bears two tusks, determine the aggregate number of tusks.

1. Twelve — ← Mova's choice · no support
2. Eight — ✓ the right answer · no support
3. Sixteen — no support
4. Four — 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

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/159-the-congo-rainforest/