--- title: The aquarium: the coral reef tank — how Mova does on the tests · Biology description: Lesson 90 of the biology course of Mova's primary school: 9 of 12 tests right, exam 0 of 4, every question with the options, the student's choice, the right answer and why it chose. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/school-run/biology/90-aquarium-the-coral-reef-tank/) [home](https://md.mova.elamur.ai/free/en/) / [at school](https://md.mova.elamur.ai/free/en/school-run/) / [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/) / 90 # The aquarium: the coral reef tank **Tests:** 9 of 12 right · **Exam:** 0 of 4 right · **Kind:** ★★ · **Understood:** 10 of 16 · **Run:** 2026-10-18, commit `f3c23ea72` Lesson 90 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](https://md.mova.elamur.ai/free/en/corpora/school/biology/90-aquarium-the-coral-reef-tank/). Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/). ### Test 1 · ★★ · right ✓ {#t1} In Finding Nemo, Marlin the dad stays a dad after Nemo's mum dies. What would happen in a real clownfish family? - **1.** He would turn into a seahorse — no support - **2.** Nothing would change — no support - **3.** Marlin would turn into a female — **← Mova's choice** · **✓ the right answer** · score 8 - **4.** He would leave the anemone for good — no support **Why:** It took the question to ask which statement is true. It chose option 3 with score 8, the only option with support. 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» (+4); the same doer «real marlin» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t1/) ### Test 2 · ★★ · right ✓ {#t2} «goldfish forget everything in 3 seconds, so who cares if it's bored» What is right? - **1.** That is a myth; goldfish remember things for months — **← Mova's choice** · **✓ the right answer** · score 14 - **2.** Only Dory remembers things — score 10 - **3.** Goldfish forget in 3 minutes instead — score 10 - **4.** Right, goldfish forget everything in 3 seconds flat — score 14 **Why:** It took the question to ask who or what does it. It chose option 1 with score 14, tied with another option at 14 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 1, line 10: «The idea that goldfish remember things for only 3 seconds is a myth: experiments show they remember feeding times and tricks for months.», reached through the remembered sentence the question matched. What matched: the same action «remember» (+6); the same thing acted on «things» (+4); it fills the role the question asks for (+3); the same doer «goldfish» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t2/) ### Test 3 · ★★ · wrong ✗ {#t3} 4 clownfish, 2 pufferfish and 3 seahorses in the tank. how many legs - **1.** 9 — **← Mova's choice** · no support - **2.** 0 — **✓ the right answer** · no support - **3.** 36 — no support - **4.** 18 — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t3/) ### Test 4 · ★★ · right ✓ {#t4} A Nemo-style clownfish has 3 white stripes. You count 5 of them. How many white stripes altogether? - **1.** 15 — **← Mova's choice** · **✓ the right answer** · no support - **2.** 8 — no support - **3.** 3 — no support - **4.** 10 — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t4/) ### Test 5 · ★★ · right ✓ {#t5} «coral's just pretty rocks, right» What is right? - **1.** It is made of tiny animals that build stone skeletons — **← Mova's choice** · **✓ the right answer** · no support - **2.** It is dead fish bones — no support - **3.** It is a kind of seaweed that grows on rocks in warm water — no support - **4.** Yes, it is just coloured stone that grows — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t5/) ### Test 6 · ★★ · right ✓ {#t6} What would happen to a reef if the sea stayed too warm for a long time? - **1.** Nothing, warm water is always good for coral — score 3 - **2.** The fish would turn white too — score 2 - **3.** The corals would bleach and could starve — **← Mova's choice** · **✓ the right answer** · score 4 - **4.** The corals would grow faster than ever — score 4 **Why:** It took the question to ask what happens next. It chose option 3 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 90, line 11: «When the sea gets too warm the algae leave, the coral turns white and can starve, which is called coral bleaching.», reached through the same lesson line as the sentence the question matched. What matched: the same action «starve» (+2); the same doer «coral» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t6/) ### Test 7 · ★★ · wrong ✗ {#t7} «why doesn't the grouper just eat the cleaner fish, free snack innit» Which answer fits? - **1.** Groupers do not eat fish at all — **← Mova's choice** · score 1 - **2.** Cleaner fish are poisonous — no support - **3.** Groupers cannot open their mouths wide enough to swallow it — no support - **4.** Both win: the big fish gets cleaned, the cleaner gets fed — **✓ the right answer** · no support **Why:** It took the question to ask which statement is true. It chose option 1 with score 1, the only option with support. Its support: lesson 42, line 6: «An adult capybara is the largest living rodent, up to about 60 kg, which is too big for most caimans; caimans mostly eat fish, snails, crabs and small animals.», reached through the option's own match among the sentences about the question's things. What matched: the same action «eat» (+2); the same thing acted on «fish» (+2). Against it: a different doer (counts against) (-1); one says «not», the other does not (counts against) (-2). The right option, 4, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t7/) ### Test 8 · ★★ · right ✓ {#t8} A cartoon pufferfish blows up by gulping a big breath of air at the surface. What is closer to the truth? - **1.** It is always round — no support - **2.** It is filled up with air by its mother — score 2 - **3.** In the sea it swallows water fast to blow up — **← Mova's choice** · **✓ the right answer** · score 8 - **4.** It blows up whenever it is happy and full — score 5 **Why:** It took the question to ask which statement is true. It chose option 3 with score 8, against 5 for the next best. Its support: lesson 90, line 13: «Pufferfish swallow water fast to blow up into a prickly ball, and many also have strong poison.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+3); the same action «swallow» (+2); the same thing acted on «water» (+2); its «because» matches the remembered cause (+2). Against it: a different doer (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t8/) ### Test 9 · ★★ · right ✓ {#t9} A seahorse dad's pouch holds 100 eggs, and his neighbour's holds 150. How many babies could hatch from both? - **1.** 250 — **← Mova's choice** · **✓ the right answer** · score 8 - **2.** 50 — score 8 - **3.** 200 — score 8 - **4.** 150 — score 8 **Why:** It took the question to ask what it is done to. It chose option 1 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 29, line 17: «Alligators bellow so deeply that the water on their backs dances, and babies call from inside their eggs when ready to hatch.», reached through the remembered sentence the question matched. What matched: the same action «hatch» (+5); the same doer «babies» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t9/) ### Test 10 · ★★ · right ✓ {#t10} «i trod on a rock in the sea and it stung me??» What could it have been? - **1.** A stonefish, which looks just like a rock — **← Mova's choice** · **✓ the right answer** · score 10 - **2.** A piece of coral that bites — no support - **3.** A clownfish hiding in the weed — no support - **4.** A seahorse with a sharp tail — no support **Why:** It took the question to ask what it is done to. It chose option 1 with score 10, the only option with support. Its support: lesson 90, line 14: «The stonefish is one of the most venomous fish; it lies still looking like a lumpy rock, has venomous spines on its back that can sting a person who treads on…», reached through the same lesson line as the sentence the question matched. What matched: the same action «look» (+4); the same doer «stonefish» (+4); the same circumstance (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t10/) ### Test 11 · ★★ · wrong ✗ {#t11} What would happen to a sea fish put in fresh water? - **1.** It would swim faster and be much happier without the salt — **← Mova's choice** · score 5 - **2.** It would get ill, because it needs the right saltiness — **✓ the right answer** · score 4 - **3.** Nothing, water is water — no support - **4.** It would turn into a river fish — no support **Why:** It took the question to ask which statement is true. It chose option 1 with score 5, against 4 for the next best. Its support: lesson 90, line 15: «Seahorses are fish that swim upright and grip seaweed with curly tails; the male carries the eggs in a pouch until the babies hatch.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «fish» (+3); the same action «swim» (+2). The right option, 2, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t11/) ### Test 12 · ★★ · right ✓ {#t12} «that eel keeps opening its gob at me, wants a fight» What is right? - **1.** It wants to be fed by hand — no support - **2.** It is singing to you — no support - **3.** It is about to jump out of the tank — no support - **4.** It is pumping water over its gills to breathe — **← Mova's choice** · **✓ the right answer** · score 12 **Why:** It took the question to ask which statement is true. It chose option 4 with score 12, the only option with support. Its support: lesson 90, line 17: «Moray eels open and close their mouths to pump water over their gills, not to threaten, and they have a second pair of jaws in their throat that pull food in.», reached through the same lesson line as the sentence the question matched. What matched: the same action «pump» (+4); the same doer «moray eels» (+4); the same place «gills» (+3); the same thing acted on «water» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/t12/) ### Exam question 1 · formal language · wrong ✗ {#e1} Identify the principal reason for which the clownfish is not harmed by the tentacles of the sea anemone. - **1.** Sea anemones possess no stinging cells — **← Mova's choice** · no support - **2.** A protective mucus upon its skin prevents the stinging — **✓ the right answer** · no support - **3.** It possesses an armoured shell — no support - **4.** It moves too swiftly for the stinging cells to be discharged — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/e1/) ### Exam question 2 · formal language · wrong ✗ {#e2} Select the response consistent with the established facts concerning the memory of the goldfish. - **1.** The memory of the goldfish endures for three seconds at most — **← Mova's choice** · no support - **2.** Goldfish retain only memories of colour — no support - **3.** Goldfish are incapable of any learning whatsoever — no support - **4.** Goldfish may be trained to retain learned behaviour for months — **✓ 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/e2/) ### Exam question 3 · formal language · wrong ✗ {#e3} Which of the following statements most accurately characterises coral? - **1.** It is a species of submarine plant — score 7 - **2.** It is formed from the skeletons of fish — **← Mova's choice** · score 10 - **3.** It is composed of small animals, polyps, which build limestone skeletons — **✓ the right answer** · score 3 - **4.** It is a mineral deposit devoid of life — score 5 **Why:** It took the question to ask who or what does it. It chose option 2 with score 10, against 7 for the next best. Its support: lesson 90, line 2: «The coral that looks like rocks and plants is really made of tiny animals, related to jellyfish, that build stone skeletons and share their home with tiny alga…», reached through the remembered sentence the question matched. What matched: the same action «make» (+6); the same thing acted on «coral» (+4). The right option, 3, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/e3/) ### Exam question 4 · formal language · wrong ✗ {#e4} It is given that, in the seahorse, the eggs are borne in a pouch until hatching. Ascertain the parent in whose pouch they are carried. - **1.** The female — **← Mova's choice** · no support - **2.** Neither, as the eggs are abandoned — no support - **3.** The male — **✓ the right answer** · no support - **4.** Both parents equally — 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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/90-aquarium-the-coral-reef-tank/e4/) - ← previous: [89. The amphibian room: poison frogs, axolotls and t…](https://md.mova.elamur.ai/free/en/school-run/biology/89-amphibian-room-poison-frogs-axolotls-frog-rescue/) - next →: [91. The aquarium: the shark tunnel and the rays](https://md.mova.elamur.ai/free/en/school-run/biology/91-the-aquarium-the-shark-tunnel-and-the-rays/) - ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)