Trees and forests through the year

Tests: 3 of 13 right · Exam: 3 of 4 right · Kind: plain · Understood: 11 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 76 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 stump has 35 rings. About how old was the tree?

1. About 350 years old — ← Mova's choice · no support
2. We cannot tell from rings — no support
3. About 3 years old — no support
4. About 35 years old — ✓ 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 · wrong ✗

In January, a park has bare trees and green trees. Which are evergreen?

1. Neither kind — ← Mova's choice · no support
2. The bare ones — no support
3. The green ones — ✓ the right answer · no support
4. Both kinds — 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 ✓

Which is true about autumn leaves?

1. Their yellow colour was there all summer, hidden by green — ← Mova's choice · ✓ the right answer · score 6
2. They turn red because the sun is closer — score 6
3. They change colour because the trees are dying slowly in the cold — no support
4. Their colour comes from cold frost — no support

Why: It took the question to ask which statement is true. 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 76, line 3: «In autumn the tree stops making green chlorophyll, so the yellow and orange colours that were hidden in the leaf show through; in spring new buds open and the…», reached through the option's own match among the sentences about the question's things. What matched: the same action «hide» (+3); the same doer «yellow colours» (+3). · the question and its options parsed, with trees and pragmatics

Test 4 · wrong ✗

A stump has a few very thin rings in a row. What probably happened in those years?

1. Years with lots of rain and sun — no support
2. Dry or cold years with poor growth — ✓ the right answer · no support
3. The tree was a different kind then — no support
4. The tree grew extra tall then — ← Mova's choice · score 6

Why: It took the question to ask which statement is true. It chose option 4 with score 6, the only option with support. Its support: lesson 76, line 6: «A tree usually grows one new ring of wood each year.», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+3); the same doer «tree» (+3). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 5 · wrong ✗

What would happen to forest soil if no leaves ever rotted?

1. It would get poorer, with no new food for plants — ✓ the right answer · score 3
2. Nothing would change at all — no support
3. Trees would grow faster — ← Mova's choice · score 4
4. It would become richer every year as the leaves stayed on top — 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 76, line 4: «A forest has layers: tall trees make the canopy, smaller trees and bushes grow beneath, and the forest floor is covered with fallen leaves that rot and feed th…», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+2); the same doer «smaller trees» (+2). The right option, 1, scored 3. · the question and its options parsed, with trees and pragmatics

Test 6 · wrong ✗

Why is it hard for small plants to grow under a thick canopy?

1. The canopy makes the soil too salty — no support
2. The canopy keeps all the rain for itself — no support
3. The tall trees block most of the light — ✓ the right answer · no support
4. The tall trees eat the small plants — ← Mova's choice · score 3

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 3, the only option with support. Its support: lesson 76, line 1: «A tree is a large plant with a woody trunk; each year it grows a new layer of wood under its bark, which we can see as a ring when the tree is cut.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «large plant» (+2); the same doer «tree» (+1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

A hillside lost all its trees. What is likely to happen in heavy rain?

1. Nothing, trees do not affect soil — ← Mova's choice · no support
2. Soil will wash away down the hill — ✓ the right answer · no support
3. The soil will hold more water — no support
4. The hill will grow new rocks — 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 ✗

Which tree keeps its leaves green through a snowy winter?

1. Maple — ← Mova's choice · no support
2. Oak — no support
3. Spruce — ✓ the right answer · no support
4. Birch — 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 9 · right ✓

Why is a tree stump like a diary?

1. Its rings record each year's growth — ← Mova's choice · ✓ the right answer · score 2
2. It shows the weather of tomorrow — no support
3. It keeps leaves from every year — no support
4. It writes the names of animals — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 2, the only option with support. Its support: lesson 76, line 5: «A wide ring in a cut trunk means a good year with plenty of rain and warmth; a thin ring means a dry or cold year — so a stump is like a diary of the tree's li…», reached through the cause of the sentence the question matched. What matched: the same doer «thin ring» (+3). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

why do leaves go all orange in autumn

1. The sun burns the leaves at the end of summer — no support
2. The green chlorophyll breaks down, so other colours show — ← Mova's choice · ✓ the right answer · score 6
3. The tree fills the leaves with orange juice — no support
4. The cold paints the leaves orange overnight — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 6, the only option with support. Its support: lesson 76, line 11: «Leaves turn yellow and orange in autumn because the green chlorophyll breaks down.», reached through a sentence linked to the one the question matched. What matched: the same action «break down» (+4); the same doer «green chlorophyll» (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

how'd u know how old that big tree stump is

1. Count the branches that grew from the trunk — ← Mova's choice · no support
2. Look at how dark the bark has gone — no support
3. Measure how wide the stump is in metres — no support
4. Count the rings, about one ring for each year — ✓ 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 12 · wrong ✗

Ava says pine trees never lose any leaves. true?

1. Yes, evergreen needles last for the tree's whole life — no support
2. No, pine trees drop all their needles in autumn — ← Mova's choice · score 6
3. No, evergreens lose old needles little by little — ✓ the right answer · score 6
4. Yes, but only if they grow in warm places — score 6

Why: It took the question to ask which statement is true. It chose option 2 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 76, line 2: «Deciduous trees, like oak, maple and birch, drop their leaves in autumn and rest through winter; evergreen trees, like pine and spruce, keep their needles all…», reached through the option's own match among the sentences about the question's things. What matched: the same action «drop» (+3); the same doer «deciduous trees» (+3); the same property (+1). Against it: a different thing acted on (counts against) (-1). The right option, 3, scored 6. · the question and its options parsed, with trees and pragmatics

Test 13 · wrong ✗

my brother reckons trees breathe in oxygen and give out carbon dioxide when they make food. right?

1. No, trees make food without any gases at all — ← Mova's choice · score 7
2. Yes, but only at night when it is dark — no support
3. Yes, trees make food from oxygen in the air — score 7
4. No, when they make food they take in carbon dioxide and give out oxygen — ✓ the right answer · score 7

Why: It took the question to ask which statement is true. 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 76, line 3: «In autumn the tree stops making green chlorophyll, so the yellow and orange colours that were hidden in the leaf show through; in spring new buds open and the…», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+3); the same doer «tree» (+3); the same thing acted on «food» (+1). The right option, 4, scored 7. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Which of the following statements most accurately characterises the means of estimating the age of a felled tree?

1. Counting the branches upon its crown — ← Mova's choice · no support
2. Counting the rings of wood in its stump — ✓ the right answer · no support
3. Measuring the height of its trunk — no support
4. Weighing the leaves which it bears — 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 ✓

Identify the principal reason for which leaves turn yellow and orange in autumn.

1. The leaves absorb the colour of the sunset — score 5
2. Frost paints the leaves with colour — no support
3. The green chlorophyll breaks down — ← Mova's choice · ✓ the right answer · score 6
4. The tree draws water into the leaves — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 6, against 5 for the next best. Its support: lesson 76, line 11: «Leaves turn yellow and orange in autumn because the green chlorophyll breaks down.», reached through a sentence linked to the one the question matched. What matched: the same action «break down» (+4); the same doer «green chlorophyll» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Select the response that is consistent with the established facts concerning evergreen trees.

1. They lose all their leaves each autumn — score 8
2. They lose all their leaves each spring — score 7
3. They retain leaves all year, losing old ones little by little — ← Mova's choice · ✓ the right answer · score 9
4. They bear no leaves of any kind — score 3

Why: It took the question to ask which statement is true. It chose option 3 with score 9, against 8 for the next best. Its support: lesson 76, line 10: «Evergreen trees keep leaves all year and lose old ones little by little.», reached through the option's own match among the sentences about the question's things. What matched: the same action «lose» (+3); the same doer «evergreen trees» (+3); the same circumstance (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

Ascertain the gases exchanged by trees in the manufacture of their food.

1. Nitrogen is taken in and oxygen given out — score 4
2. Oxygen is taken in and carbon dioxide given out — no support
3. Oxygen is taken in and nitrogen given out — no support
4. Carbon dioxide is taken in and oxygen given out — ← Mova's choice · ✓ the right answer · score 5

Why: It took the question to ask which statement is true. It chose option 4 with score 5, against 4 for the next best. Its support: lesson 57, line 15: «Cutting down forests destroys habitats and removes trees that clean the air by taking in carbon dioxide.», reached through the remembered sentence the question matched. What matched: the same action «take in» (+4); the same thing acted on «carbon dioxide» (+1). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/world/76-trees-and-forests-through-the-year/