How plants make their food

Tests: 9 of 13 right · Exam: 2 of 4 right · Kind: ★ · Understood: 10 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 22 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 · ★ · right ✓

A plant is kept in a dark cupboard for two weeks. Why does it turn pale and weak?

1. It cannot make food without light — ← Mova's choice · ✓ the right answer · score 1
2. It makes too much oxygen — score 1
3. It gets too much carbon dioxide — score -1
4. Darkness poisons its roots — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 22, line 14: «Plants cannot make food in the dark.», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+2). Against it: the same doer «plants» (-1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · right ✓

A boy says a plant gets its food from the soil, like we get food from a plate. Which is right?

1. Plants get their food only from rain — score 4
2. Plants get their food from the wind — score 4
3. The plant makes its own food from light, air and water — ← Mova's choice · ✓ the right answer · score 8
4. The boy is right: plants eat food from the soil with their roots — score 6

Why: It took the question to ask which statement is true. It chose option 3 with score 8, against 6 for the next best. Its support: lesson 17, line 12: «Plants take in carbon dioxide and give out oxygen when they make food in sunlight.», reached through the remembered sentence the question matched. What matched: the same action «make» (+4); the same doer «plants» (+2); the same thing acted on «food» (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · right ✓

A scientist grew a willow tree in a pot for five years: the tree gained many kilograms, the soil lost very little. Where did the mass come from?

1. Mostly from the pot itself — no support
2. Mostly from the sunlight's weight — no support
3. Mostly from the soil in the pot — score 4
4. Mostly from air and water — ← Mova's choice · ✓ the right answer · score 10

Why: It took the question to ask where. It chose option 4 with score 10, against 4 for the next best. Its support: lesson 20, line 3: «A cold glass gets wet on the outside because water vapour in the warm air touches the cold glass, cools and condenses: the water comes from the air, not throug…», reached through the remembered sentence the question matched. What matched: the same action «come» (+6); it fills the role the question asks for (+4); the same place «air» (+2). Against it: a different doer (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 4 · ★ · right ✓

Which of these does NOT go into photosynthesis?

1. Oxygen — ← Mova's choice · ✓ the right answer · no support
2. Carbon dioxide — no support
3. Light — no support
4. 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

Test 5 · ★ · right ✓

Why is a sealed glass jar with a plant and a snail in a sunny place good for both of them?

1. The plant eats the snail's light — score 3
2. The snail makes all the food that the plant needs to grow in the jar — score 4
3. The plant makes oxygen and the snail makes carbon dioxide — ← Mova's choice · ✓ the right answer · score 7
4. The jar makes fresh air for them — score 2

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 7, against 4 for the next best. Its support: lesson 22, line 13: «Plants also breathe, using some oxygen, all day and night, but in daylight they make much more oxygen than they use.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «plants» (+3); the same action «make» (+2); the same thing acted on «more oxygen» (+2). · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · right ✓

Why do many plants on a dark forest floor have very large leaves?

1. To keep the rain off the soil — score 1
2. To catch the little light that reaches them — ← Mova's choice · ✓ the right answer · score 3
3. To hold more air inside them, like a balloon — no support
4. To hide from the animals — score -1

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 3, against 1 for the next best. Its support: lesson 22, line 7: «Plants need light, water and carbon dioxide to make food.», reached through a sentence linked to the one the question matched. What matched: the same doer «plants» (+2); the same thing acted on «light» (+2). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · wrong ✗

What would happen to animals if all plants and algae disappeared?

1. Nothing, animals make their own food — score 3
2. They would eat soil instead — score 2
3. They would breathe carbon dioxide — ← Mova's choice · score 4
4. They would run out of food and oxygen — ✓ the right answer · score 2

Why: It took the question to ask what happens next. It chose option 3 with score 4, against 3 for the next best. Its support: lesson 22, line 13: «Plants also breathe, using some oxygen, all day and night, but in daylight they make much more oxygen than they use.», reached through the same lesson line as the sentence the question matched. What matched: the same action «breathe» (+2); the same doer «plants» (+2). The right option, 4, scored 2. · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

What does the energy of sunlight do in a leaf?

1. It powers the making of sugar — ← Mova's choice · ✓ the right answer · score 8
2. It dries the leaf out — no support
3. It changes the leaf into soil — no support
4. It turns into water — no support

Why: It took the question to ask what is done. It chose option 1 with score 8, the only option with support. Its support: lesson 21, line 16: «Plants do not take their food from the soil; they make it themselves in their leaves.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same action «make» (+4). Against it: a different doer (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

Where do the grains of wheat we eat get their starch from?

1. From flour the rain carried down — ← Mova's choice · no support
2. From insects caught by its roots — no support
3. From sugar the plant made in its leaves — ✓ the right answer · no support
4. From starch it took out of the soil — 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 · ★ · wrong ✗

what do plants need to make food

1. Soil, water and oxygen — ← Mova's choice · no support
2. Light, water and carbon dioxide — ✓ the right answer · no support
3. Only water and soil — no support
4. Darkness, warmth and oxygen — 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 11 · ★ · wrong ✗

why r leaves green

1. The water inside them is green — ← Mova's choice · no support
2. They are painted by the minerals in soil — no support
3. They soak up green light to grow — no support
4. They have chlorophyll that catches light — ✓ 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 · ★ · right ✓

a video said plants only breathe at night and not in the day. true?

1. Yes, they only breathe in the dark, and in the day they just make food instead — score 7
2. No, they breathe all the time, but by day they make more oxygen than they use — ← Mova's choice · ✓ the right answer · score 10
3. No, plants never breathe at all — score 0
4. Yes, and they make oxygen all night — score 10

Why: It took the question to ask which statement is true. It chose option 2 with score 10, tied with another option at 10 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 22, line 13: «Plants also breathe, using some oxygen, all day and night, but in daylight they make much more oxygen than they use.», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+4); the same doer «plants» (+4); the same thing acted on «more oxygen» (+2). · the question and its options parsed, with trees and pragmatics

Test 13 · ★ · right ✓

Leo reckons a big tree gets most of its weight from the soil. right?

1. No, most comes from the sunlight itself — score 2
2. Yes, the soil goes up into the trunk — no support
3. Yes, and the hole round a tree gets deeper each year it grows — no support
4. No, most comes from carbon dioxide in the air and water — ← Mova's choice · ✓ the right answer · score 4

Why: It took the question to ask which statement is true. It chose option 4 with score 4, against 2 for the next best. Its support: lesson 22, line 16: «Most of the mass of a tree comes from carbon dioxide from the air and water, not from the soil.», reached through the option's own match among the sentences about the question's things. What matched: the same place «carbon dioxide» (+2); the same action «come» (+1); the same doer «most» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

State the substances required by plants for the manufacture of food.

1. Water, soil and sugar — ← Mova's choice · no support
2. Light, oxygen and nitrogen — no support
3. Light, water and carbon dioxide — ✓ the right answer · no support
4. Soil, oxygen and darkness — 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 ✗

Identify the substance within the leaf that captures the energy of light.

1. Dissolved oxygen — ← Mova's choice · no support
2. Calcium salts — no support
3. Chlorophyll — ✓ the right answer · no support
4. Stored starch — 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 3 · formal language · right ✓

Select the response that is consistent with the established facts concerning the origin of the mass of a tree.

1. It derives chiefly from carbon dioxide of the air and from water — ← Mova's choice · ✓ the right answer · no support
2. It derives chiefly from sunlight, which is converted directly into wood — no support
3. It derives chiefly from the soil — no support
4. It derives chiefly from oxygen of the air — 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 · right ✓

Which of the following statements most accurately characterises the respiration of plants?

1. They respire day and night, but in daylight produce more oxygen than they consume — ← Mova's choice · ✓ the right answer · score 6
2. They do not respire at any time — no support
3. They respire solely during the night, photosynthesis replacing respiration by day — no support
4. They respire solely during the day — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 6, the only option with support. Its support: lesson 22, line 13: «Plants also breathe, using some oxygen, all day and night, but in daylight they make much more oxygen than they use.», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+3); the same thing acted on «more oxygen» (+2); the same place «daylight» (+2). Against it: a different doer (counts against) (-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/22-photosynthesis/