Vents and trenches: tubeworms, iron snails, the Challenger Deep and life without sunlight
Tests: 4 of 11 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 7 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 177 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 ✗
«tubeworms are plants innit, they're red and they grow» What is right?
- 1. No, they are animals that get food from bacteria inside them — ✓ the right answer · score 5
- 2. No, they are a kind of rock — score 3
- 3. Yes, they are a kind of seaweed — score 3
- 4. Yes, they make all their own food from sunlight, just like grass — ← Mova's choice · score 8
Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 5 for the next best. Its support: lesson 61, line 3: «These plants still make their food from sunlight like any green plant; the insects are their «vitamins», giving them the nitrogen and minerals the bog cannot.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «food» (+3); the same place «sunlight» (+3); the same action «make» (+2). The right option, 1, scored 5. · the question and its options parsed, with trees and pragmatics
Test 2 · ★★ · wrong ✗
«vents r just underwater fire, nothing can live there» What is right?
- 1. Vents are frozen, not hot — ← Mova's choice · no support
- 2. Only plants live near them — no support
- 3. Right, nothing lives near them — no support
- 4. Vents are hot water, not fire, and they are crowded with life — ✓ 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 3 · ★★ · wrong ✗
«3 yeti crabs on a rock, each has 10 legs counting the claws, how many legs»
- 1. 13 — ← Mova's choice · no support
- 2. 33 — no support
- 3. 30 — ✓ the right answer · no support
- 4. 20 — 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 ✓
«octopus mum and 2 octopus friends lol, how many arms»
- 1. 24 — ← Mova's choice · ✓ the right answer · no support
- 2. 16 — no support
- 3. 30 — no support
- 4. 8 — 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 the tubeworms if a vent stopped pouring out hot chemical water?
- 1. Their bacteria would have no chemicals, so the worms would starve — ✓ the right answer · no support
- 2. They would let go and swim up to the surface to find new food there — ← Mova's choice · score 3
- 3. They would turn to sunlight instead — no support
- 4. Nothing, they need nothing — no support
Why: It took the question to ask what happens next. It chose option 2 with score 3, the only option with support. Its support: lesson 73, line 4: «In games and cartoons a creature «evolves» in a flash of light into a new form; real evolution never happens to one animal in its life, it happens to a whole p…», reached through what followed the sentence the question matched. What matched: the same action «happen» (+4). Against it: a different doer (counts against) (-1). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 6 · ★★ · right ✓
In the cartoon SpongeBob, Bikini Bottom is full of sunlight and seaweed. Which is true of the deepest vents?
- 1. They are lit by the Sun like a beach — no support
- 2. No sunlight reaches them, and life there runs on chemicals — ← Mova's choice · ✓ the right answer · score 2
- 3. They are full of grass — no support
- 4. They are just as warm and bright as a rock pool — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 2, the only option with support. Its support: lesson 177, line 2: «No sunlight ever reaches there, yet these hot vents are crowded with life: giant red-tipped tubeworms, hairy crabs, swarms of shrimp and even a snail wearing a…», reached through the option's own match among the sentences about the question's things. What matched: the same action «reach» (+2). · the question and its options parsed, with trees and pragmatics
Test 7 · ★★ · wrong ✗
«mate says an elephant on ur thumb is nothing, the deep is easy» What is right?
- 1. Only a mouse on your thumb, which you could hardly feel down there at all — ← Mova's choice · no support
- 2. The deep presses less than air — no support
- 3. The deep has no pressure at all — no support
- 4. The deepest trench presses about as hard as an elephant on your thumb, which is huge — ✓ 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 ✓
A cartoon fish at the bottom of the Mariana Trench has a hard armoured body. What does the real deepest fish have?
- 1. Soft bones and a watery body — ← Mova's choice · ✓ the right answer · score 6
- 2. A body full of air, like a balloon — score 6
- 3. A body made of solid iron plates — score 4
- 4. A huge heavy skull for strength — no support
Why: It took the question to ask what it is done to. It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 175, line 11: «Hatchetfish have thin silver bodies, lights on their bellies, and eyes that point upwards to spot food falling from above.», reached through the remembered sentence the question matched. What matched: the same light verb (be, have, do, get, go) (+4); it fills the role the question asks for (+2). · the question and its options parsed, with trees and pragmatics
Test 9 · ★★ · wrong ✗
«who's the only animal with iron armour, a knight?»
- 1. The giant tubeworm — ← Mova's choice · no support
- 2. The scaly-foot snail — ✓ the right answer · no support
- 3. The yeti crab — no support
- 4. The snailfish — 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 ✓
«we found plastic at the bottom of the deepest trench? no way» What is right?
- 1. Only in shallow seas — no support
- 2. Yes, scientists found plastic inside amphipods there — ← Mova's choice · ✓ the right answer · score 5
- 3. No, nothing lives there to check, so nobody knows — no support
- 4. No, plastic always floats at the top of the sea — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 177, line 12: «Amphipods are small shrimp-like animals in the deepest trenches that eat dead stuff sinking from above, and scientists have found plastic inside some of them.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «plastic» (+3); the same action «find» (+2). · the question and its options parsed, with trees and pragmatics
Test 11 · ★★ · wrong ✗
Why might some scientists think life on Earth started at vents?
- 1. Vents are the warmest place on the surface of the Earth, warmer than deserts — ← Mova's choice · no support
- 2. Vents give energy from chemicals without needing sunlight — ✓ the right answer · no support
- 3. Dinosaurs lived at vents — no support
- 4. Vents are full of sunlight — 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 1 · formal language · wrong ✗
Identify the principal source of energy upon which the communities of hydrothermal vents depend.
- 1. Sunlight penetrating to the sea floor — ← Mova's choice · no support
- 2. The heat of the water consumed directly by the animals — no support
- 3. Chemicals dissolved in the vent water, used by bacteria to manufacture food — ✓ the right answer · no support
- 4. Organic matter imported exclusively from the surface — 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 giant tubeworm?
- 1. It photosynthesises by means of its red plumes — no support
- 2. It possesses neither mouth nor gut and is nourished by internal bacteria — ← Mova's choice · ✓ the right answer · score 3
- 3. It captures crabs with its plumes — no support
- 4. It is a variety of marine plant — no support
Why: It took the question to ask who or what does it. It chose option 2 with score 3, the only option with support. Its support: lesson 177, line 7: «Giant tubeworms have no mouth and no gut; bacteria living inside them make food from chemicals in the vent water, and the worms can grow over two metres long.», 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 «giant tubeworms» (+1). · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · wrong ✗
State the depth of the Challenger Deep and the year in which it was first attained by human beings.
- 1. Nearly fifty kilometres; never attained — ← Mova's choice · no support
- 2. Nearly eleven kilometres; first attained in 1960 — ✓ the right answer · no support
- 3. Nearly one kilometre; first attained in 1860 — no support
- 4. Nearly eleven kilometres; first attained in 2019 — 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 4 · formal language · wrong ✗
Ascertain the reason for which the Mariana snailfish withstands the pressure prevailing at its depth.
- 1. It retains a large volume of air within its body — ← Mova's choice · score 1
- 2. It ascends to shallow water daily — no support
- 3. Its body is enclosed in armour of iron — no support
- 4. Its skeleton is soft and its tissues are largely water — ✓ 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 177, line 11: «Snailfish have soft bones and watery bodies, so the pressure does not crush them, and the deepest fish ever filmed was a snailfish at over eight kilometres.», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+2). Against it: a different thing acted on (counts against) (-1). The right option, 4, 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/177-vents-and-trenches-tubeworms-iron-snails-the-challenger-deep-and-life-without-sunlight/