Fish, frogs and reptiles

Tests: 4 of 13 right · Exam: 3 of 4 right · Kind: ★ · Understood: 12 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 74 of the world 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 ✗

A fish stays still in the middle of a tank, neither sinking nor rising. What helps it do this?

1. Its tail fin — ← Mova's choice · score 7
2. Its swim bladder — ✓ the right answer · no support
3. Its gills — no support
4. Its lateral line — score 5

Why: It took the question to ask who or what does it. It chose option 1 with score 7, against 5 for the next best. Its support: lesson 74, line 7: «A fish's tail fin pushes it forward, and its other fins steer and balance it.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «fish» (+3); it fills the role the question asks for (+3); the same doer «other fins» (+2). Against it: a different action (counts against) (-1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · wrong ✗

A fish in a dark, muddy river swims away before a pike, a big hunting fish, can reach it. How did it sense the pike?

1. It saw the pike clearly even in the dark water — ← Mova's choice · score 3
2. It smelled the pike's breath as it came closer — no support
3. Its lateral line felt the water move — ✓ the right answer · no support
4. It heard the pike's heartbeat through the water — score 3

Why: It took the question to ask what something is like. It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 74, line 1: «A fish takes in water through its mouth and pushes it out over its gills, where the blood picks up the oxygen dissolved in the water. Its tail fin drives it fo…», reached through a sentence linked to the one the question matched. What matched: the same doer «fish» (+2); the same place «water» (+2). Against it: a different action (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 3 · ★ · wrong ✗

Scientists find fewer frogs in a pond each year. What might this warn them about?

1. There are too many insects — ← Mova's choice · no support
2. The frogs have moved into the sea — no support
3. The water may be polluted — ✓ the right answer · no support
4. The pond is getting too clean — 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 ✗

Why could a frog live in a desert much less easily than a lizard?

1. Its eggs need hot sand — no support
2. It cannot eat insects in a desert — ← Mova's choice · score 2
3. Its thin, moist skin would dry out — ✓ the right answer · no support
4. It needs more sunshine than a lizard — no support

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 2, the only option with support. Its support: lesson 74, line 14: «Many frogs catch insects with a long, sticky tongue.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «insects» (+2); the same doer «many frogs» (+1). Against it: a different action (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 5 · ★ · right ✓

A pet snake has dull, cloudy eyes and soon leaves behind a long, thin, empty skin. What happened?

1. It was sick and lost its scales — no support
2. It changed into a new kind of snake — no support
3. It shed its old skin as it grew — ← Mova's choice · ✓ the right answer · score 11
4. Another snake lost its skin there — score 2

Why: It took the question to ask which statement is true. It chose option 3 with score 11, against 2 for the next best. Its support: lesson 74, line 18: «Snakes shed their skin as they grow, often in one piece.», reached through the remembered sentence the question matched. What matched: the same action «shed» (+4); its «because» matches the remembered cause (+4); the same doer «snakes» (+2); the same thing acted on «skin» (+1). · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · wrong ✗

A zoo feeds its crocodile much less often than its lion. Why is this possible?

1. The lion is much smaller than the crocodile — ← Mova's choice · no support
2. The crocodile does not burn food to keep warm — ✓ the right answer · no support
3. The crocodile eats only plants — no support
4. The crocodile drinks more water — 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 ✗

Which is true about a shark?

1. It is a reptile with fins — ← Mova's choice · no support
2. It is a fish whose skeleton is cartilage, not bone — ✓ the right answer · no support
3. It has no skeleton at all — no support
4. It is a mammal that breathes air, like a whale or a dolphin — 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 · ★ · wrong ✗

A frog sits still and an insect flies near. What happens next?

1. The frog shoots out its long, sticky tongue — ✓ the right answer · score -1
2. The frog stings it with poison — score 4
3. The frog chases it with its claws — score 4
4. The frog waits for it to land in its mouth — ← Mova's choice · score 5

Why: It took the question to ask what happens next. It chose option 4 with score 5, against 4 for the next best. Its support: lesson 74, line 3: «Frogs and other amphibians have thin, moist skin, and they can take in some oxygen through it, so they must keep it damp; their eggs have no shell and dry out…», reached through what followed the sentence the question matched. What matched: its «because» matches the remembered cause (+4); the same doer «frogs» (+3). Against it: a different action (counts against) (-2). The right option, 1, scored -1. · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · right ✓

A turtle lays its eggs on a dry beach, but a frog lays its eggs in a pond. What is the main reason?

1. Pond water is too warm for turtle eggs — score 3
2. The turtle wants its eggs to be cold — score 3
3. The turtle's eggs have a tough shell that keeps water in — ← Mova's choice · ✓ the right answer · score 11
4. Frogs cannot walk onto beaches — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 11, against 3 for the next best. Its support: lesson 74, line 3: «Frogs and other amphibians have thin, moist skin, and they can take in some oxygen through it, so they must keep it damp; their eggs have no shell and dry out…», 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 «eggs» (+3); the same thing acted on «shell» (+3); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · wrong ✗

why's the frog pond gone quiet since the factory, frogs gone?

1. Frogs only leave because the water got too cold for them — score 5
2. Frogs need oily water to keep their thin skin wet and soft — ← Mova's choice · score 6
3. Factory noise frightens the frogs, so they move to the sea — score 4
4. Frogs' thin skin is easily harmed by polluted water — ✓ the right answer · score 4

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 6, against 5 for the next best. Its support: lesson 74, line 3: «Frogs and other amphibians have thin, moist skin, and they can take in some oxygen through it, so they must keep it damp; their eggs have no shell and dry out…», reached through a sentence linked to the one the question matched. What matched: the same action «keep» (+2); the same doer «frogs» (+2); the same thing acted on «skin» (+2). The right option, 4, scored 4. · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

how do sharks float with no swim bladder thingy

1. They hold their breath at the surface — score 5
2. They fill their bones with air like birds — no support
3. They sleep on the sea floor and never float — score 0
4. They keep swimming, and their skeleton is light bendy cartilage — ← Mova's choice · ✓ the right answer · score 6

Why: It took the question to ask which statement is true. It chose option 4 with score 6, against 5 for the next best. Its support: lesson 74, line 11: «A shark has no swim bladder, so it keeps swimming to stay up, and its light, bendy skeleton helps it.», reached through the remembered sentence the question matched. What matched: the same action «swim» (+4); the same doer «shark» (+2). · the question and its options parsed, with trees and pragmatics

Test 12 · ★ · wrong ✗

Leo says snakes flick their tongue to scare u. true?

1. Yes, and they also use it to taste the ground — score 5
2. Yes, it is only a warning to stay back and keep away — no support
3. No, they flick it to cool their bodies down — ← Mova's choice · score 11
4. No, they flick it to pick up smells from the air — ✓ the right answer · score 11

Why: It took the question to ask which statement is true. It chose option 3 with score 11, tied with another option at 11 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 74, line 17: «A snake flicks its tongue to pick up smells from the air.», reached through the remembered sentence the question matched. What matched: the same action «flick» (+4); its «because» matches the remembered cause (+4); the same doer «snake» (+2); the same thing acted on «tongue» (+1). The right option, 4, scored 11. · the question and its options parsed, with trees and pragmatics

Test 13 · ★ · right ✓

my brother reckons fish breathe air with lungs like us. right?

1. No, fish take oxygen from the water with their gills — ← Mova's choice · ✓ the right answer · score 8
2. Yes, fish swim up to breathe air every minute — score 6
3. Yes, but only big fish like sharks — no support
4. No, fish do not need any oxygen at all — score 2

Why: It took the question to ask which statement is true. It chose option 1 with score 8, against 6 for the next best. Its support: lesson 74, line 6: «Fish take oxygen from the water with their gills.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «fish» (+2); the same place «water» (+2); the same circumstance (+2); the same action «take» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Which of the following statements most accurately characterises the means by which fish obtain oxygen?

1. They obtain oxygen from the food they eat — score 9
2. They breathe air at the surface with lungs — score 6
3. They take oxygen through their scales alone — score 10
4. They take oxygen from the water with their gills — ← Mova's choice · ✓ the right answer · score 18

Why: It took the question to ask who or what does it. It chose option 4 with score 18, against 10 for the next best. Its support: lesson 74, line 6: «Fish take oxygen from the water with their gills.», reached through the remembered sentence the question matched. What matched: the same place «water» (+6); it fills the role the question asks for (+4); the same action «take» (+2); the same doer «fish» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Identify the function of the swim bladder of a fish.

1. It permits the fish to float at one depth — ← Mova's choice · ✓ the right answer · no support
2. It enables the fish to breathe air — no support
3. It enables the fish to digest its food — no support
4. It permits the fish to sense movements in the water — 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 3 · formal language · right ✓

Ascertain the principal reason for which frogs are readily harmed by polluted water.

1. Their skin is thin and moist — ← Mova's choice · ✓ the right answer · score 5
2. They possess no gills at any stage — no support
3. They drink great quantities of water — no support
4. Their skin is dry and scaly — score 4

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 74, line 13: «Because their skin is thin, frogs are easily harmed by polluted water.», reached through a sentence linked to the one the question matched. What matched: the same doer «skin» (+2); the same property (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Select the response that is consistent with the established facts concerning the skeleton of a shark.

1. It is composed of solid bone throughout — ← Mova's choice · no support
2. A shark possesses no skeleton whatsoever — no support
3. It is composed of cartilage, not bone — ✓ the right answer · no support
4. It is composed of hollow bone — 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/world/74-fish-frogs-reptiles/