Mangroves: trees in salt water, mudskippers, archerfish and swimming tigers
Tests: 6 of 11 right · Exam: 1 of 4 right · Kind: ★ · Understood: 9 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 178 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 ✗
«mangroves r just trees that got flooded, they'll die soon» What is right?
- 1. Yes, every flood kills them — ← Mova's choice · score 5
- 2. No, they are made to live with their roots in salty water — ✓ the right answer · score 2
- 3. Yes, salt water kills all trees, even the strong ones — score 5
- 4. No, they are a kind of seaweed — no support
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 60, line 10: «Cork comes from the thick bark of the cork oak, peeled about every 9 years without killing the tree.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «tree» (+3); the same action «kill» (+2). The right option, 2, scored 2. · the question and its options parsed, with trees and pragmatics
Test 2 · ★ · right ✓
«mudskipper walking on mud?? fish cant leave water mate» What is right?
- 1. Right, it will die in a minute — no support
- 2. Right, it must be a lizard — no support
- 3. It is a frog, not a fish — no support
- 4. Mudskippers keep water in their gills and breathe through their skin, so they can — ← 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 152, line 17: «Fish breathe by drawing water in through the mouth and over the gills, so a goldfish opens and shuts its mouth all the time.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «water» (+3); the same place «mouth» (+3). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics
Test 3 · ★ · wrong ✗
In Peter Pan the crocodile follows Captain Hook because it swallowed a ticking clock. What is true of real saltwater crocodiles?
- 1. They follow ticking sounds — ← Mova's choice · no support
- 2. They are dangerous, so people must stay far from riverbanks — ✓ the right answer · no support
- 3. They live only in cold mountain lakes, far away from the sea and from people — no support
- 4. They are friendly to pirates — 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 ✗
In The Little Mermaid, Sebastian the crab sings with two equal claws. How is a male fiddler crab different?
- 1. Both claws are tiny and the same size — ← Mova's choice · no support
- 2. It has four big claws, two on each side — no support
- 3. It has no claws at all, only soft legs — no support
- 4. One claw is giant and one is small — ✓ 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 ✗
«2 fiddler crabs, each got 1 big claw n 1 small, how many small claws»
- 1. 3 — ← Mova's choice · no support
- 2. 1 — no support
- 3. 4 — no support
- 4. 2 — ✓ 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 6 · ★ · right ✓
«spotted 3 tigers swimming in the Sundarbans, how many legs n tails altogether»
- 1. 15 — ← Mova's choice · ✓ the right answer · no support
- 2. 18 — no support
- 3. 9 — no support
- 4. 12 — 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 ✓
What would happen to a coast if all its mangroves were cut down?
- 1. There would be more young fish — no support
- 2. The coast would be safer from storms, with no trees in the way of the sea — no support
- 3. Storm waves would hit harder, and some reefs would have fewer fish — ← Mova's choice · ✓ the right answer · score 10
- 4. Nothing would change — no support
Why: It took the question to ask what happens next. It chose option 3 with score 10, the only option with support. Its support: lesson 178, line 14: «Many young reef fish grow up safely among mangrove roots, so where mangroves are cut down, some reefs have fewer fish.», reached through what followed the sentence the question matched. What matched: the same doer «reefs» (+4); the same thing acted on «fewer fish» (+4); the same light verb (be, have, do, get, go) (+2). · the question and its options parsed, with trees and pragmatics
Test 8 · ★ · right ✓
An archerfish shoots at a beetle on a leaf above the water. Why does it not aim where the beetle seems to be?
- 1. It cannot see the beetle at all from under the water — score 2
- 2. It wants to miss on purpose — no support
- 3. Water bends light, so the beetle looks in the wrong place — ← Mova's choice · ✓ the right answer · score 7
- 4. Water makes everything look bigger only — score 4
Why: It took the question to ask why something happens (its cause). It chose option 3 with score 7, against 4 for the next best. Its support: lesson 178, line 8: «Archerfish shoot jets of water to knock insects into the water, and they aim correctly even though water bends light and makes things look in a different place.», reached through the same lesson line as the sentence the question matched. What matched: the same action «look» (+4); the same circumstance (+2); a different doer (counts against) (+1). · the question and its options parsed, with trees and pragmatics
Test 9 · ★ · wrong ✗
«crocs only live in rivers, the sea's too salty for em» What is right?
- 1. Only baby crocodiles go in the sea — ← Mova's choice · no support
- 2. Right, salt kills crocodiles — no support
- 3. Saltwater crocodiles live in salt and fresh water and swim far out to sea — ✓ the right answer · no support
- 4. Crocodiles live only in deserts — 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 10 · ★ · right ✓
A long green spike floats on the sea for months and lands on a muddy beach. What is it most likely?
- 1. A mangrove seedling that will grow roots — ← Mova's choice · ✓ the right answer · score 5
- 2. A lost pencil — no support
- 3. A piece of the tail of a swimming tiger — no support
- 4. A dead fish — 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 178, line 12: «Mangrove seeds sprout while still on the tree, drop as long spikes, and can float for months until they reach mud and grow roots.», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+4); the same thing acted on «roots» (+1). · the question and its options parsed, with trees and pragmatics
Test 11 · ★ · right ✓
«dad says there's a lizard swimming under the boat for ages, lizards can't do that»
- 1. Lizards breathe water through gills, like fish, so they never need to come up — no support
- 2. Right, all lizards sink — score 2
- 3. Water monitors swim with their tails and stay under for many minutes — ← Mova's choice · ✓ the right answer · score 4
- 4. It must be a fish — score 3
Why: It took the question to ask which statement is true. It chose option 3 with score 4, against 3 for the next best. Its support: lesson 178, line 15: «Water monitors are big lizards that swim with their long tails, hunt crabs and fish, and can stay underwater for many minutes.», reached through the option's own match among the sentences about the question's things. What matched: the same action «swim» (+2); the same circumstance (+2). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the function of the pneumatophores of certain species of mangrove.
- 1. They capture insects for nutrition — ← Mova's choice · no support
- 2. They protrude from the mud and admit air to the root system — ✓ the right answer · no support
- 3. They anchor the tree to rock — no support
- 4. They secrete salt into the surrounding sea — 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 2 · formal language · wrong ✗
Which of the following statements most accurately characterises the hunting method of the archerfish?
- 1. It captures insects with an extended tongue — ← Mova's choice · score 8
- 2. It ascends trees to seize insects — no support
- 3. It awaits insects falling of their own accord into the water beneath the mangroves — score 7
- 4. It dislodges insects with a jet of water, correcting for the bending of light — ✓ the right answer · no support
Why: It took the question to ask who or what does it. It chose option 1 with score 8, against 7 for the next best. Its support: lesson 157, line 7: «Army ants raid in a moving carpet of hundreds of thousands, and antbirds follow to catch the insects fleeing in front, not to eat the ants.», reached through a sentence linked to the one the question matched. What matched: the same action «catch» (+6); the same thing acted on «insects» (+3). 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
Exam question 3 · formal language · right ✓
Select the response consistent with the established facts concerning the Sundarbans.
- 1. It is the largest mangrove forest in the world and harbours swimming Bengal tigers — ← Mova's choice · ✓ the right answer · score 8
- 2. It is a mountain forest devoid of water — no support
- 3. It is a desert in which tigers are absent — no support
- 4. It is a coral reef in the Pacific Ocean — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 8, the only option with support. Its support: lesson 178, line 10: «The Sundarbans of India and Bangladesh is the biggest mangrove forest in the world, and its Bengal tigers swim between islands and eat fish, crabs and deer.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «biggest mangrove forest» (+3); the same place «world» (+3); the same light verb (be, have, do, get, go) (+2). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
Ascertain the principal benefit conferred upon coastlines by mangrove forests.
- 1. Their roots diminish the force of waves and retain the soil — ✓ the right answer · no support
- 2. They raise the temperature of the sea — no support
- 3. They repel all marine animals by means of a poison exuded by their roots — ← Mova's choice · score 1
- 4. They prevent the formation of clouds — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 1, the only option with support. Its support: lesson 159, line 4: «The forest also hides strange animals: the okapi with zebra-striped legs is really a giraffe's cousin, and the pangolin, covered in scales, rolls into a ball t…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «strange animals» (+3). Against it: a different action (counts against) (-2). The right option, 1, 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/178-mangroves-trees-in-salt-water-mudskippers-archerfish-and-swimming-tigers/