Coral reefs, rockpools and the seashore
Tests: 3 of 11 right · Exam: 2 of 4 right · Kind: ★★ · Understood: 7 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 9 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 ✓
«finding nemo: dad raises nemo alone, so that's what clownfish do» Which is closer to the truth?
- 1. Clownfish mums never die — score 1
- 2. Clownfish babies raise themselves in the anemone from day one, without any parents at all — score 3
- 3. Clownfish dads always raise babies alone — score 2
- 4. When the female dies the biggest male turns female, so Marlin would become the mum — ← Mova's choice · ✓ the right answer · score 7
Why: It took the question to ask what it is done to. It chose option 4 with score 7, against 3 for the next best. Its support: lesson 9, line 4: «In Finding Nemo Marlin raises Nemo alone after Nemo's mum dies; real clownfish all hatch as males, and when the female of a group dies, the biggest male turns…», reached through the same lesson line as the sentence the question matched. What matched: the same action «become» (+2); the same doer «real marlin» (+2); it fills the role the question asks for (+2); the same thing acted on «mum» (+1). · the question and its options parsed, with trees and pragmatics
Test 2 · ★★ · right ✓
«patrick star's dumb cos he's a starfish lol» Which is the true part?
- 1. Starfish have a brain in each arm — score 6
- 2. A real starfish has no brain at all — ← Mova's choice · ✓ the right answer · score 8
- 3. Starfish are fish, so they have fish brains — score 6
- 4. Starfish have huge brains — score 6
Why: It took the question to ask which statement is true. It chose option 2 with score 8, against 6 for the next best. Its support: lesson 9, line 5: «In SpongeBob SquarePants Patrick Star is famously brainless, and that is the one true joke: a real starfish has no brain at all, yet it walks on hundreds of tu…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «real starfish» (+3); the same thing acted on «brain» (+2); the same place «all» (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics
Test 3 · ★★ · wrong ✗
Count them: three crabs, each with 2 claws and 8 walking legs. How many legs altogether, counting claws?
- 1. 33 — ← Mova's choice · no support
- 2. 24 — no support
- 3. 18 — no support
- 4. 30 — ✓ 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 4 · ★★ · right ✓
Count them: a starfish lost 1 of its 5 arms and two other starfish have all 5. How many arms in the rockpool?
- 1. 14 — ← Mova's choice · ✓ the right answer · no support
- 2. 10 — no support
- 3. 13 — no support
- 4. 15 — 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 ✗
What would happen to a coral reef if the sea stayed too hot for a very long time?
- 1. The corals would move to deeper water — score 2
- 2. Nothing, corals love heat — score 0
- 3. The corals would grow faster and bigger — ← Mova's choice · score 4
- 4. The corals would bleach, starve and die — ✓ the right answer · score 2
Why: It took the question to ask what happens next. It chose option 3 with score 4, against 2 for the next best. Its support: lesson 9, line 10: «When the sea gets too warm, corals push out their algae and turn white, which is called bleaching; without the algae they starve if the heat lasts too long, bu…», reached through the same lesson line as the sentence the question matched. What matched: the same action «turn» (+2); the same doer «corals» (+2). The right option, 4, scored 2. · the question and its options parsed, with trees and pragmatics
Test 6 · ★★ · wrong ✗
«dead jellyfish thing on the beach, gonna poke it with my finger» What is the best advice?
- 1. Fine, dead ones can't sting — ← Mova's choice · no support
- 2. Don't: a Portuguese man o' war can sting even when dead; tell a lifeguard — ✓ the right answer · no support
- 3. Pick it up and throw it back in the sea, where it can come back to life and swim away — no support
- 4. Fine, just rinse your finger in the sea — 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 · ★★ · wrong ✗
«ugh this limpet's stuck, gimme a knife to get it off» Which is the best answer?
- 1. Leave it: it clamps to stay alive and returns to its own spot — ✓ the right answer · no support
- 2. Pull harder, it is only a stone stuck to another stone — ← Mova's choice · score 1
- 3. Use a knife, they don't feel anything — no support
- 4. Tap it, it always lets go — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 1, the only option with support. Its support: lesson 1, line 2: «Lift a stone in the garden and the woodlice underneath scurry away at once: they are not shy, they are drying out, because their damp, dark home under the ston…», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+2); the same thing acted on «stone» (+1). 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
Test 8 · ★★ · wrong ✗
«white sandy beach so pretty» Which surprising fact is true?
- 1. All beach sand is made by crabs grinding shells with their claws — ← Mova's choice · no support
- 2. White sand is ground-up seaweed — no support
- 3. White sand is made of salt — no support
- 4. Some white tropical beach sand comes partly from parrotfish poo — ✓ 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
Test 9 · ★★ · wrong ✗
«that coral's just pretty rocks innit» What is right?
- 1. Yes, it is coloured stone — ← Mova's choice · no support
- 2. Coral is built by living animals, the polyps — ✓ the right answer · no support
- 3. It is a kind of seaweed — no support
- 4. Yes, it is rock from old volcanoes — 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
Test 10 · ★★ · wrong ✗
«that seahorse dad's pregnant?! is that legit» What is right?
- 1. No, seahorses lay eggs on rocks and then swim away — ← Mova's choice · no support
- 2. Yes, in seahorses the father carries the eggs in a pouch and gives birth — ✓ the right answer · no support
- 3. Yes, but only once in his life — no support
- 4. No, it is a female with a big tummy — 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
Test 11 · ★★ · wrong ✗
«crabs walk sideways cos they're drunk» What is right?
- 1. Their leg joints bend best that way, though they can walk forwards slowly — ✓ the right answer · score 5
- 2. They cannot walk forwards at all — score 2
- 3. They are copying the waves — no support
- 4. They walk sideways only on sand — ← Mova's choice · score 10
Why: It took the question to ask which statement is true. It chose option 4 with score 10, against 5 for the next best. Its support: lesson 9, line 15: «Crabs walk sideways because their leg joints bend best that way, though many can also walk slowly forwards, have 10 legs counting the 2 claws, and grow by moul…», reached through the remembered sentence the question matched. What matched: the same action «walk» (+4); the same doer «crabs» (+4); the same property (+2). The right option, 1, scored 5. · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · right ✓
Which of the following statements most accurately characterises a coral reef?
- 1. A coral reef is an accumulation of shells and pebbles deposited over many centuries by the action of waves — score 5
- 2. A coral reef is a mass of petrified seaweed — score 5
- 3. A coral reef is a formation of volcanic rock — score 7
- 4. A coral reef is a structure of limestone constructed by colonies of minute animals termed polyps — ← Mova's choice · ✓ the right answer · score 8
Why: It took the question to ask who or what does it. It chose option 4 with score 8, against 7 for the next best. Its support: lesson 9, line 9: «The Great Barrier Reef off Australia is about 2,300 km long and is the largest structure built by living things.», 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 (+3); the same doer «great barrier reef» (+2); the same thing acted on «largest structure» (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics
Exam question 2 · formal language · wrong ✗
Identify the principal cause of coral bleaching.
- 1. The onset of winter in tropical seas — ← Mova's choice · no support
- 2. The application of paint by divers — no support
- 3. Excessive cleaning by parrotfish — no support
- 4. Elevated sea temperatures induce corals to expel the algae resident within their tissues — ✓ 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 ✓
Select the response consistent with the established facts concerning the sex of clownfish.
- 1. Clownfish possess no sex whatsoever — no support
- 2. All clownfish hatch as males, and the largest individual of a group may become female — ← Mova's choice · ✓ the right answer · score 5
- 3. All clownfish hatch as females and remain so — score 3
- 4. The sex of clownfish is fixed for life at hatching and cannot alter under any circumstances — no support
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 9, line 7: «All clownfish hatch as males, and the biggest one in a group can turn into the female.», reached through the option's own match among the sentences about the question's things. What matched: the same action «hatch» (+2); the same circumstance (+2); the same doer «clownfish» (+1). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
Ascertain the aggregate number of legs, inclusive of claws, possessed by four crabs, each bearing two claws and eight walking legs.
- 1. Eight — ← Mova's choice · no support
- 2. Thirty-two — no support
- 3. Forty — ✓ the right answer · no support
- 4. Thirty-six — 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/9-coral-reefs-rockpools-and-the-seashore/