Frogs of the world: tree frogs, glass frogs, flying frogs and the goliath frog

Tests: 7 of 11 right · Exam: 0 of 4 right · Kind: plain · Understood: 9 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 308 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 ✗

Count them: 2 frogs sit on a log. How many toes do they have altogether?

1. 32 — ← Mova's choice · no support
2. 18 — no support
3. 40 — no support
4. 36 — ✓ 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 2 · right ✓

Count them: you have 20 fingers and toes. A frog has 18 toes. How many more do you have?

1. 2 — ← Mova's choice · ✓ the right answer · no support
2. 0 — no support
3. 10 — no support
4. 4 — 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 ✗

Count them: a Wallace's flying frog uses each of its webbed feet as a parachute. How many parachutes?

1. 2 — ← Mova's choice · no support
2. 4 — ✓ the right answer · no support
3. 8 — no support
4. 6 — 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 ✗

About how many 8-millimetre frogs would fit in a line along a 32-centimetre goliath frog?

1. About 400 — ← Mova's choice · no support
2. About 40 — ✓ the right answer · no support
3. About 4 — no support
4. About 24 — 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 · right ✓

In a cartoon, a frog sips water from a glass through a straw. What is true for most real frogs?

1. They drink a whole glass every day — no support
2. They drink only with a straw-like tongue — no support
3. They never take in any water — score 4
4. They soak water in through their skin — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 4 for the next best. Its support: lesson 308, line 13: «Most frogs do not drink with their mouths; they soak water in through their skin, especially a thin patch on the belly, which is why dirty water hurts them so…», reached through the option's own match among the sentences about the question's things. What matched: the same place «skin» (+4); the same action «soak in» (+3); the same thing acted on «water» (+1). · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

In cartoons a frog sits on a lily pad in any dirty pond and smiles. What would really happen in polluted water?

1. The frog would turn into a fish — no support
2. Nothing, because frogs only take in water through their mouths and spit dirt out — score 3
3. The frog would get bigger — score -1
4. The frog could be hurt quickly, because water soaks in through its skin — ← 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 3 for the next best. Its support: lesson 308, line 13: «Most frogs do not drink with their mouths; they soak water in through their skin, especially a thin patch on the belly, which is why dirty water hurts them so…», reached through the option's own match among the sentences about the question's things. What matched: the same place «skin» (+4); the same action «soak in» (+3). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 7 · right ✓

«my brother says a frog closing its eyes when it eats is cos it's shy lol» What is right?

1. It is falling asleep after each bite — no support
2. Frogs are shy and close their eyes from embarrassment when people watch — score 4
3. It pulls its eyes down to help push the food down its throat — ← Mova's choice · ✓ the right answer · score 7
4. Frogs never close their eyes — score 1

Why: It took the question to ask which statement is true. It chose option 3 with score 7, against 4 for the next best. Its support: lesson 32, line 11: «A frog swallows prey whole and pulls its eyeballs down into its head to help push the food down its throat.», reached through the option's own match among the sentences about the question's things. What matched: the same place «throat» (+4); the same action «push» (+3); the same thing acted on «food» (+1). Against it: the same doer «frog» (-1). · the question and its options parsed, with trees and pragmatics

Test 8 · right ✓

You look under a leaf over a stream in Costa Rica and see a little frog sitting by some eggs. Who is it likely to be?

1. A glass frog father guarding his eggs — ← Mova's choice · ✓ the right answer · score 3
2. A lost tadpole that has just grown legs — no support
3. A mother frog laying her very first egg — score 3
4. A hungry frog eating the eggs one by one — score 3

Why: It took the question to ask which statement is true. 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 308, line 8: «In many glass frogs the father guards the eggs on a leaf, keeping them wet and safe from wasps.», reached through the option's own match among the sentences about the question's things. What matched: the same action «guard» (+3); the same thing acted on «eggs» (+1). Against it: the same doer «father» (-1). · the question and its options parsed, with trees and pragmatics

Test 9 · right ✓

What would happen if a snake started eating a clutch of red-eyed tree frog eggs over a pond?

1. The snake would turn red — score 7
2. All the eggs would freeze — no support
3. Some eggs could hatch early and the tadpoles drop into the water — ← Mova's choice · ✓ the right answer · score 9
4. The eggs would grow little legs and run off to hide — score 6

Why: It took the question to ask what happens next. It chose option 3 with score 9, against 7 for the next best. Its support: lesson 308, line 6: «The red-eyed tree frog of Central America sleeps by day with its bright colours tucked away and flashes its red eyes when disturbed, which may startle a predat…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «eggs» (+4); the same action «hatch» (+3); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

«can a frog really fly?? mate says so» What is the truth?

1. Yes, some frogs have wings like birds — score 2
2. No frog can move through the air at all — no support
3. Some frogs, like Wallace's flying frog, glide on webbed feet, but none truly fly — ← Mova's choice · ✓ the right answer · score 3
4. Yes, they fly as high as eagles — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 3, against 2 for the next best. Its support: lesson 308, line 12: «Frogs usually have four toes on each front foot and five on each back foot, 18 toes in all; the long back feet are often webbed for jumping and swimming.», reached through the option's own match among the sentences about the question's things. What matched: the same place «front foot» (+4). Against it: the same doer «frogs» (-1). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

A goliath frog pushes stones around at the edge of a river. Why, according to a 2019 study?

1. To find hidden worms under the stones — ← Mova's choice · score 7
2. To build a small pool for its eggs — ✓ the right answer · no support
3. To sharpen its teeth — no support
4. To play a game with other frogs — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 7, the only option with support. Its support: lesson 107, line 14: «Asian small-clawed otters live in big families and find crabs and shellfish by feeling under stones with clever, finger-like paws; otters for cafés and the pet…», reached through the option's own match among the sentences about the question's things. What matched: the same place «stones» (+4); the same action «feel» (+3). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the mechanism by which the toe pads of tree frogs adhere to smooth surfaces.

1. A permanent glue secreted by the claws — ← Mova's choice · no support
2. Microscopic hooks that penetrate the surface — no support
3. Suction generated by the lungs of the frog — no support
4. Minute hexagonal cells separated by mucus, gripping in the manner of a wet tyre — ✓ 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 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the manner in which most frogs obtain water?

1. Water is not required by frogs at any stage of life — ← Mova's choice · score 10
2. Water is absorbed through the skin, particularly through a thin region of the belly — ✓ the right answer · score 6
3. Water is obtained exclusively from the bodily fluids of the insects which it consumes — score 3
4. Water is drunk through the mouth in large quantities — score 3

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 89, line 7: «Frogs breathe and take in water partly through their thin, moist skin, so tanks are kept damp, and gloves protect their skin from the oils and soap on our hand…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «frogs» (+2); the same thing acted on «water» (+2); a different action (counts against) (+2). The right option, 2, scored 6. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Select the response consistent with the established facts concerning the goliath frog.

1. It is capable of powered flight between trees — no support
2. It is the smallest frog in existence, attaining approximately eight millimetres in length — score 2
3. It is the largest frog in existence, attaining approximately thirty-two centimetres in length — ✓ the right answer · score 2
4. It is a species of toad native to Australia — ← Mova's choice · score 3

Why: It took the question to ask which statement is true. It chose option 4 with score 3, against 2 for the next best. Its support: lesson 32, line 1: «Frogs, toads, newts and salamanders are amphibians, which means «double life»: most start life in water and later live partly on land.», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+3); the same light verb (be, have, do, get, go) (+2). Against it: the same doer «frogs» (-1); a different thing acted on (counts against) (-1). The right option, 3, scored 2. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Ascertain the location in which the male Darwin's frog rears his offspring.

1. Within a nest of leaves above a stream — ← Mova's choice · no support
2. Upon his back in a pouch of skin — no support
3. Within his vocal sac until they emerge as froglets — ✓ the right answer · no support
4. Within his stomach until they are fully grown frogs — 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/308-frogs-of-the-world-tree-frogs-glass-frogs-flying-frogs-and-the-goliath-frog/