Great rivers and wetlands: Nile crocodiles, hippos, giant catfish and the Pantanal
Tests: 7 of 11 right · Exam: 2 of 4 right · Kind: ★ · Understood: 7 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 184 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 ✗
«hippos look so chill, can we row up close» What should you do?
- 1. Yes, they are gentle and love being stroked on the nose by people — no support
- 2. No, keep far away, hippos are territorial and dangerous — ✓ the right answer · score 5
- 3. Only if they yawn — ← Mova's choice · score 10
- 4. Yes, feed them bread — no support
Why: It took the question to ask what is done. It chose option 3 with score 10, against 5 for the next best. Its support: lesson 184, line 6: «Hippos yawn widely to show their huge teeth as a warning; they are very territorial and are often said to kill more people in Africa than lions do.», 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 action «yawn» (+3); the same doer «hippos» (+3). The right option, 2, scored 5. · the question and its options parsed, with trees and pragmatics
Test 2 · ★ · right ✓
In Fantasia, hippos dance ballet in tutus. Which is true of real hippos?
- 1. They can fly a little — no support
- 2. They are shy and harmless — no support
- 3. They live in snowy mountains — no support
- 4. They are territorial and often said to kill more people in Africa than lions — ← Mova's choice · ✓ the right answer · score 4
Why: It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 184, line 6: «Hippos yawn widely to show their huge teeth as a warning; they are very territorial and are often said to kill more people in Africa than lions do.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+3); the same action «say» (+2). Against it: the same doer «hippos» (-1). · the question and its options parsed, with trees and pragmatics
Test 3 · ★ · right ✓
«5 hippos in the river, how many legs»
- 1. 20 — ← Mova's choice · ✓ the right answer · no support
- 2. 10 — no support
- 3. 15 — no support
- 4. 25 — 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 ✓
«12 flamingos standing on 1 leg each, how many legs in the water»
- 1. 12 — ← Mova's choice · ✓ the right answer · no support
- 2. 24 — no support
- 3. 36 — no support
- 4. 6 — 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 ✗
«Okavango flood: 3 elephants came, how many trunks and tails altogether»
- 1. 3 — ← Mova's choice · no support
- 2. 12 — no support
- 3. 6 — ✓ the right answer · no support
- 4. 9 — 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 ✓
What would happen to a zoo flamingo fed only on plain bread?
- 1. It would get pinker and pinker each year — no support
- 2. Nothing at all — no support
- 3. It would slowly lose its pink colour — ← Mova's choice · ✓ the right answer · score 6
- 4. It would turn bright blue — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 6, the only option with support. Its support: lesson 184, line 15: «Flamingos get their pink colour from pink chemicals in the tiny algae and shrimps they eat, so zoo flamingos are given special food to stay pink.», reached through a sentence linked to the one the question matched. What matched: the same doer «flamingos» (+3); the same thing acted on «pink colour» (+3). · the question and its options parsed, with trees and pragmatics
Test 7 · ★ · wrong ✗
«crocs gotta eat every day like us» What is right?
- 1. Right, every day — ← Mova's choice · no support
- 2. They eat every hour — no support
- 3. Crocodiles never eat anything at all, they live on the sunshine — no support
- 4. After a big meal a Nile crocodile can go many months without eating — ✓ 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 8 · ★ · right ✓
«flood in a desert in the DRY season? ur making it up» What is right?
- 1. In the Okavango, far-away rain arrives months later, in the dry season — ← Mova's choice · ✓ the right answer · no support
- 2. It floods with sand, not water — no support
- 3. Right, impossible — no support
- 4. It is only a rumour — 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 · ★ · wrong ✗
What would happen to a salmon put in the wrong river?
- 1. It might be lost, because salmon find their home river by smell — ✓ the right answer · score 5
- 2. It would read a map — no support
- 3. It would just stay out at sea and never lay any eggs anywhere at all — score 6
- 4. It would turn into a trout — ← Mova's choice · score 8
Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 6 for the next best. Its support: lesson 10, line 8: «Atlantic salmon grow big at sea, then swim up the river where they hatched to lay their eggs, finding it by smell; they stop eating on the way and live on the…», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+5); the same doer «atlantic salmon» (+3). The right option, 1, scored 5. · the question and its options parsed, with trees and pragmatics
Test 10 · ★ · right ✓
«giant fish as big as a car? must be a whale» What is right?
- 1. It was a giant freshwater stingray caught in the Mekong in 2022 — ← Mova's choice · ✓ the right answer · no support
- 2. It was a whale in a river — no support
- 3. It was a shark from the sea — no support
- 4. No fish that big exists — 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 ✓
«bird with a shoe for a beak just standing there for hours, is it broken»
- 1. It is waiting for lungfish to come up to breathe — ← Mova's choice · ✓ the right answer · score 10
- 2. It is stuck in the mud and cannot get out until the next rain — score -1
- 3. It is a statue — no support
- 4. It is asleep for the whole winter — score 2
Why: It took the question to ask which statement is true. It chose option 1 with score 10, against 2 for the next best. Its support: lesson 184, line 11: «The shoebill is a huge bird with a beak like a shoe that stands still for hours waiting for lungfish to come up to breathe, and it clatters its beak loudly.», reached through the same lesson line as the sentence the question matched. What matched: the same action «wait» (+5); the same circumstance (+3); its «because» matches the remembered cause (+2). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the means by which the Ganges river dolphin locates its food.
- 1. The detection of heat by its fins — ← Mova's choice · no support
- 2. The following of fishing vessels — no support
- 3. Echolocation, its vision being of little use in turbid water — ✓ the right answer · no support
- 4. Acute vision in clear water — 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 · right ✓
Which of the following statements most accurately characterises the Pantanal?
- 1. It is a mountain range in Asia — no support
- 2. It is the largest tropical wetland in the world, situated in Brazil — ← Mova's choice · ✓ the right answer · score 4
- 3. It is the largest hot desert in the world — no support
- 4. It is a coral reef in the Indian Ocean — no support
Why: It took the question to ask who or what does it. It chose option 2 with score 4, the only option with support. Its support: lesson 184, line 10: «The Pantanal in Brazil is the world's biggest tropical wetland, where jaguars hunt caimans (cousins of crocodiles) and capybaras (giant rodents) and big animal…», 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 (+2); the same doer «pantanal» (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · right ✓
Ascertain the reason for which the Okavango Delta is inundated during the dry season.
- 1. Rainfall occurs there exclusively in the dry season — no support
- 2. Precipitation falling at a great distance requires months to flow down to the delta — ← Mova's choice · ✓ the right answer · score 7
- 3. Sea water enters the delta from the coast — no support
- 4. The flood is caused by melting snow upon the delta — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 7, the only option with support. Its support: lesson 184, line 14: «The Okavango river floods a desert in the middle of the dry season, because rain from far away takes months to flow down to the delta, and the flood feeds elep…», reached through the option's own match among the sentences about the question's things. What matched: the same property (+3); the same action «flow down» (+2); the same circumstance (+2). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
State the origin of the pink colouration of flamingos.
- 1. The blood vessels of their feathers — ← Mova's choice · no support
- 2. Pigments contained in the algae and small crustaceans that they consume — ✓ the right answer · no support
- 3. A colour present invariably from hatching — no support
- 4. Exposure to the setting sun — 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/184-great-rivers-and-wetlands-nile-crocodiles-hippos-giant-catfish-and-the-pantanal/