Caves: bat clouds, blind fish, the olm, glowworms and a sealed cave

Tests: 5 of 11 right · Exam: 2 of 4 right · Kind: ★ · Understood: 10 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 179 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 ✗

«blind as a bat lol» What is right?

1. Bats see only colours, not shapes, so they bump into every wall and tree — ← Mova's choice · no support
2. Bats are not blind: many see well and also use echoes — ✓ the right answer · no support
3. Right, bats have no eyes — no support
4. Right, bats see only at noon — 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 2 · ★ · wrong ✗

In Batman films a huge swarm of bats bursts out of a cave. Where do real millions of bats do that every evening?

1. In Antarctica, under the ice — ← Mova's choice · no support
2. Under the sea — no support
3. On the Moon — no support
4. Bracken Cave in Texas — ✓ 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 · ★ · right ✓

In cartoons, Dracula the vampire bat drinks blood in a castle. What do most bats from Bracken Cave really eat?

1. Insects — ← Mova's choice · ✓ the right answer · no support
2. Bread and cheese — no support
3. Garlic — no support
4. Blood — 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 ✓

«saw 4 cave crickets, 6 legs n 2 feelers each, how many legs»

1. 24 — ← Mova's choice · ✓ the right answer · no support
2. 32 — no support
3. 16 — 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 ✗

«the olm's got 3 toes on each front foot n 2 on each back foot, how many toes on one olm»

1. 20 — ← Mova's choice · no support
2. 10 — ✓ the right answer · no support
3. 12 — no support
4. 5 — 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 · ★ · wrong ✗

What would happen to eyes in a fish family that lives in a dark cave for many, many generations?

1. Nothing ever changes in any animal, not even in a million years — no support
2. The fish would grow bigger eyes to see better — ← Mova's choice · score 5
3. The fish would grow wings — no support
4. Eyes could shrink and disappear, since they are useless there — ✓ the right answer · score 5

Why: It took the question to ask which statement is true. It chose option 2 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 176, line 13: «Many deep fish have big eyes to catch faint light from glowing animals, and some have tube-shaped eyes that look upward.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «big eyes» (+3); its «because» matches the remembered cause (+2). The right option, 4, scored 5. · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · right ✓

«the cave in Romania stinks of rotten eggs, nothing can live there» What is right?

1. Dozens of kinds live there, many found nowhere else — ← Mova's choice · ✓ the right answer · score -1
2. Only bats live there, and only in the summer months — no support
3. It is full of rabbits — no support
4. Right, nothing lives there — 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 179, line 15: «Movile Cave in Romania was sealed off for millions of years until 1986; bacteria make food from chemicals, and dozens of kinds of animals live there, most of t…», reached through the remembered sentence the question matched. What matched: the same action «live» (+1). Against it: the same doer «dozens» (-2). · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · wrong ✗

«my bro touched a stalactite, so what, it's a rock» What is right?

1. Touching makes it glow — ← Mova's choice · score 8
2. It will grow faster — no support
3. It grows back in a day — no support
4. Skin oil can stop it growing, and it took thousands of years to form — ✓ the right answer · score 7

Why: It took the question to ask what it is done to. It chose option 1 with score 8, against 7 for the next best. Its support: lesson 179, line 14: «Stalactites grow from dripping water that leaves behind a tiny bit of chalky mineral, over thousands of years, and touching them can stop them growing, because…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «touching» (+3); it fills the role the question asks for (+3); the same thing acted on «stalactites» (+2). The right option, 4, scored 7. · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

What would happen to the beetles on a cave floor if all the bats left?

1. They would get more food — no support
2. They would turn into bats — score 0
3. They would lose much of their food, the guano — ✓ the right answer · no support
4. Nothing, because they eat sunlight and need no food from bats — ← Mova's choice · score 6

Why: It took the question to ask what happens next. It chose option 4 with score 6, against 0 for the next best. Its support: lesson 179, line 3: «Food is scarce in the dark, so a lot of it comes from outside: bats fly out at sunset to eat insects and come back to drop their droppings, which feed beetles…», reached through the same lesson line as the sentence the question matched. What matched: the same action «eat» (+4); the same doer «bats» (+3). Against it: a different thing acted on (counts against) (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · right ✓

«glowworms r worms that glow» What is right?

1. They are tiny fish that glow in the dark — no support
2. They are fly larvae, not true worms — ← Mova's choice · ✓ the right answer · score 4
3. Right, they are earthworms that glow — no support
4. They are glowing stones that look like worms — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 4, the only option with support. Its support: lesson 179, line 9: «In Waitomo Caves in New Zealand, glowworms, which are fly larvae (young flies, like maggots), glow to lure insects into sticky threads and make the ceiling loo…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «glowworms» (+2); the same thing acted on «fly larvae» (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

Which bird could find its way in a pitch-black cave?

1. A cave swiftlet, by clicking — ← Mova's choice · ✓ the right answer · score 10
2. An ostrich, by running very fast — score 6
3. A pigeon, by its sense of smell — no support
4. A chicken, by its sharp eyesight — score 6

Why: It took the question to ask who or what does it. It chose option 1 with score 10, against 6 for the next best. Its support: lesson 179, line 2: «Cave animals find their way in other ways: bats and swiftlets click and listen to the echoes, cave crickets feel the way with very long feelers, and some fish…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same action «click» (+3); the same doer «bats» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Identify the means by which bats locate obstacles and prey in complete darkness.

1. They emit light from their mouths — no support
2. They emit clicks and interpret the returning echoes — ← Mova's choice · ✓ the right answer · score 2
3. They rely exclusively upon touch — no support
4. They perceive heat with their wings — 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 153, line 5: «Bats are not blind; all bats can see, and many see quite well.», reached through the option's own match among the sentences about the question's things. What matched: the same action «see» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Ascertain the reason for which certain cave fish have lost their eyes.

1. The cave water dissolves eyes — no support
2. The eyes were removed by predators — score 3
3. They are born without eyes for one generation only — ← Mova's choice · score 5
4. Eyes confer no benefit in total darkness and their maintenance consumes energy — ✓ the right answer · score 5

Why: It took the question to ask which statement is true. It chose option 3 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 179, line 7: «Blind cave fish have lost their eyes because in total darkness eyes are useless and making them costs energy; Mexican cave fish have river relatives with eyes.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «river relatives» (+3); the same circumstance (+2). The right option, 4, scored 5. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Which of the following statements most accurately characterises the glowworms of the Waitomo Caves?

1. They are lamps installed for the benefit of visitors — ← Mova's choice · score 7
2. They are luminous minerals within the rock — score 7
3. They are fly larvae which emit light to lure insects into sticky threads — ✓ the right answer · score 7
4. They are earthworms that glow when touched — score 7

Why: It took the question to ask who or what does it. It chose option 1 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 179, line 4: «In Romania there is even a cave sealed off for millions of years where the air smells of rotten eggs, and the whole food chain starts with bacteria eating chem…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «cave» (+3). The right option, 3, scored 7. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

Select the response consistent with the established facts concerning Movile Cave.

1. It was sealed for millions of years, and its food chain begins with bacteria consuming chemicals — ← Mova's choice · ✓ the right answer · score 9
2. It contains no living organisms — no support
3. It was discovered in the year 1086 — no support
4. It is illuminated by sunlight through its roof — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 9, the only option with support. Its support: lesson 179, line 4: «In Romania there is even a cave sealed off for millions of years where the air smells of rotten eggs, and the whole food chain starts with bacteria eating chem…», reached through the same lesson line as the sentence the question matched. What matched: the same action «start» (+4); the same circumstance (+3); the same doer «whole food chain» (+2). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/179-caves-bat-clouds-blind-fish-the-olm-glowworms-and-a-sealed-cave/