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Deserts, rainforests and grasslands

Tests: 5 of 13 right · Exam: 1 of 4 right · Kind: ★ · Understood: 9 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 66 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 traveller packs only shorts and T-shirts for a week of camping in the Sahara. What problem might he have?

  • 1. He may freeze at night, when the desert gets cold — ← Mova's choice · ✓ the right answer · no support
  • 2. He will find the days too cold for shorts — no support
  • 3. He will be soaked by heavy rain every single afternoon — no support
  • 4. He will need snow boots for the dunes — 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 ✗

Which is true about deserts?

  • 1. Deserts get rain almost every day — score 4
  • 2. Every desert is hot and full of sand dunes — ← Mova's choice · score 6
  • 3. A desert is defined by very little rain, so it can be cold — ✓ the right answer · no support
  • 4. Nothing at all lives in deserts — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 6, against 4 for the next best. Its support: lesson 66, line 9: «Most deserts are rocky or stony rather than covered in sand dunes.», reached through the remembered sentence the question matched. What matched: the same circumstance (+4); the same doer «most deserts» (+2). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · wrong ✗

People cut down a patch of rainforest and plant crops, but after a few years the crops grow badly. Why?

  • 1. It stops raining in the rainforest forever — ← Mova's choice · no support
  • 2. The soil gets too rich for crops — no support
  • 3. The poor soil quickly loses its few nutrients once the forest is gone — ✓ the right answer · no support
  • 4. The sunlight becomes too weak — 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 ✗

A monkey, a parrot and a sloth spend almost all their lives high in the trees. In which layer do they live?

  • 1. The roots — ← Mova's choice · no support
  • 2. The riverbed — no support
  • 3. The canopy — ✓ the right answer · no support
  • 4. The forest floor — 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 ✓

A field of grass is burned by a fire in summer, yet it is green again a few weeks later. Why?

  • 1. Animals came and planted new grass there with their feet — no support
  • 2. The heat of the fire turned all the black ash into grass — no support
  • 3. New grass seeds fall down from the sky with the next rain — no support
  • 4. The grass grows again from its base near the ground — ← Mova's choice · ✓ the right answer · score 4

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 4, the only option with support. Its support: lesson 66, line 5: «Grass survives grazing and fire because it grows from near the ground, not from its tips: when an antelope bites off the top, or a fire sweeps over, the grass…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «grass» (+2); the same action «grow» (+1); the same circumstance (+1). · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · wrong ✗

Why is Ukraine called the breadbasket of Europe?

  • 1. It is covered by thick tropical rainforest full of monkeys — ← Mova's choice · no support
  • 2. It has no winter at all — no support
  • 3. It is a desert with many oases — no support
  • 4. Its steppe soil is rich black chernozem, good for wheat — ✓ 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 7 · ★ · wrong ✗

Two places are equally warm, but one gets 2,000 millimetres of rain a year and the other 100. Which is more likely a desert?

  • 1. Both are deserts — ← Mova's choice · no support
  • 2. The one with 2,000 millimetres — no support
  • 3. The one with 100 millimetres — ✓ the right answer · no support
  • 4. Neither, because both are warm — 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 ✗

Lions, zebras and acacia trees are seen on a wide grassy plain in Africa. Which biome is it?

  • 1. Desert — ← Mova's choice · no support
  • 2. Rainforest — no support
  • 3. Savanna — ✓ the right answer · no support
  • 4. Polar land — 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 · ★ · wrong ✗

Why can a rainforest grow so many different kinds of living things?

  • 1. It gets very little rain — ← Mova's choice · score 6
  • 2. It has the richest soil on Earth — no support
  • 3. It is warm and wet all year, so plants grow without stopping — ✓ the right answer · score 5
  • 4. It has long cold winters that kill pests — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, against 5 for the next best. Its support: lesson 66, line 3: «A tropical rainforest lies near the equator, is hot all year and gets heavy rain almost every day. It has more kinds of living things than any other land biome…», reached through the option's own match among the sentences about the question's things. What matched: the same light verb (be, have, do, get, go) (+3); the same thing acted on «heavy rain» (+2); the same doer «tropical rainforest» (+1). The right option, 3, scored 5. · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · right ✓

why's the desert freezing at night when its boiling all day

  • 1. Cold winds blow in from the sea every night — no support
  • 2. The desert is much higher up than other places — score 5
  • 3. The sand sucks the heat down deep at night — no support
  • 4. Dry clear air lets the heat escape fast at night — ← 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 5 for the next best. Its support: lesson 66, line 2: «A desert gets less than about 250 millimetres of rain a year. Not all deserts are hot or sandy: most are rocky or stony, and Antarctica is the largest desert o…», reached through the same lesson line as the sentence the question matched. What matched: the same action «escape» (+4); the same doer «heat» (+4). · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

why are there so many kinds of animals in the rainforest

  • 1. Rainforests are cold, so the animals there live longer lives — no support
  • 2. Rainforests have the richest soil on Earth — no support
  • 3. Rainforests are hot and wet all year, so life thrives there — ← Mova's choice · ✓ the right answer · score 6
  • 4. Rainforests are too dark for hunters to find prey — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 6, the only option with support. Its support: lesson 66, line 3: «A tropical rainforest lies near the equator, is hot all year and gets heavy rain almost every day. It has more kinds of living things than any other land biome…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «tropical rainforest» (+4); the same property (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 12 · ★ · right ✓

my mate says the biggest desert in the world is the Sahara. true?

  • 1. Yes, because deserts must be hot and sandy — score 5
  • 2. No, the Amazon is the largest desert — no support
  • 3. No, Antarctica is the largest; the Sahara is the largest hot desert — ← Mova's choice · ✓ the right answer · score 6
  • 4. Yes, the Sahara is the largest desert of any kind — score 4

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 66, line 2: «A desert gets less than about 250 millimetres of rain a year. Not all deserts are hot or sandy: most are rocky or stony, and Antarctica is the largest desert o…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «antarctica» (+4); the same property (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 13 · ★ · wrong ✗

Ava reckons all deserts are just sand dunes everywhere. right?

  • 1. Yes, apart from the ones that are covered in ice — no support
  • 2. Yes, every desert is covered in sand dunes — ← Mova's choice · score 7
  • 3. No, most deserts are rocky or stony — ✓ the right answer · score 5
  • 4. No, most deserts are covered in short grass — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 7, against 5 for the next best. Its support: lesson 66, line 9: «Most deserts are rocky or stony rather than covered in sand dunes.», reached through the remembered sentence the question matched. What matched: the same circumstance (+4); the same action «cover» (+3). The right option, 3, scored 5. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Which of the following statements most accurately characterises a desert?

  • 1. A region invariably hot both by day and by night — ← Mova's choice · score 7
  • 2. A region with more species than any other biome — no support
  • 3. A region receiving less than about 250 millimetres of rain a year — ✓ the right answer · score 2
  • 4. A region invariably covered in sand dunes — score 2

Why: It took the question to ask who or what does it. It chose option 1 with score 7, against 2 for the next best. Its support: lesson 66, line 8: «Antarctica is the largest desert on Earth; the Sahara is the largest hot desert.», reached through the remembered sentence the question matched. What matched: the same thing acted on «largest hot desert» (+4); the same property (+2); a different doer (counts against) (+1). The right option, 3, scored 2. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Identify the largest desert upon the Earth.

  • 1. The Gobi — ← Mova's choice · no support
  • 2. The Sahara — no support
  • 3. Antarctica — ✓ the right answer · no support
  • 4. The Arabian Desert — 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 · wrong ✗

Ascertain the principal reason for which hot deserts become very cold at night.

  • 1. Sand absorbs heat from the air at night — ← Mova's choice · no support
  • 2. The wind brings snow from the mountains — no support
  • 3. Dry clear air permits heat to escape — ✓ the right answer · no support
  • 4. The Moon draws away the day's warmth — 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 ✓

Select the response that is consistent with the established facts concerning the soil of a tropical rainforest.

  • 1. It is the most fertile soil in the world, owing to the fallen leaves — no support
  • 2. It consists solely of black chernozem, as upon the grassy steppes — no support
  • 3. It is perpetually frozen beneath the surface, as in the northern tundra — no support
  • 4. It is often poor, the nutrients being quickly taken up by plants — ← 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, the only option with support. Its support: lesson 66, line 3: «A tropical rainforest lies near the equator, is hot all year and gets heavy rain almost every day. It has more kinds of living things than any other land biome…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «plants» (+4); the same thing acted on «nutrients» (+2). Against it: a different action (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/66-deserts-rainforests-grasslands/