Bats of the world: flying foxes, vampire bats, the bumblebee bat and tent-makers

Tests: 7 of 11 right · Exam: 2 of 4 right · Kind: plain · Understood: 12 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 314 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: a bat wing has 4 long fingers and a thumb. How many long wing fingers does one bat have?

1. 5 — ← Mova's choice · no support
2. 8 — ✓ the right answer · no support
3. 4 — no support
4. 10 — 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 ✗

Count them: 3 bats hang upside down by their feet. How many feet are holding on?

1. 12 — ← Mova's choice · score 2
2. 9 — score 2
3. 6 — ✓ the right answer · score 2
4. 3 — score 2

Why: It took the question to ask what it is done to. It chose option 1 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 25, line 5: «And Eeyore is gloomy and cartoon donkeys are stubborn and stupid, but real donkeys are careful: they stop when they judge something unsafe.», reached through the option's own match among the sentences about the question's things. What matched: the same action «stop» (+2). The right option, 3, scored 2. · the question and its options parsed, with trees and pragmatics

Test 3 · right ✓

In a Dracula cartoon a vampire bat bites a man's neck and sucks out his blood. What is the truth?

1. Real vampire bats turn people into bats — score 2
2. Real vampire bats only eat fruit — score 1
3. Real vampire bats suck people dry every night through two hollow fangs — score -3
4. Real vampire bats make a small cut on cattle or birds and lap the blood — ← 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 2 for the next best. Its support: lesson 95, line 12: «Only three of more than 1,400 kinds of bat drink blood; they live in Central and South America, make a tiny cut on sleeping animals and lap the blood.», reached through a sentence linked to the one the question matched. What matched: the same action «make» (+3); the same doer «bats» (+2); the same thing acted on «tiny cut» (+1). · the question and its options parsed, with trees and pragmatics

Test 4 · right ✓

«u cant tell me bats are friends, they r creepy blood suckers» What does science show about vampire bats?

1. They share food with roost-mates, often ones that shared with them — ← Mova's choice · ✓ the right answer · score 5
2. Only flying foxes have friends — no support
3. They steal food from each other every night, even from their own babies — score 5
4. They never help each other at all — no support

Why: It took the question to ask what it is done to. It chose option 1 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 115, line 7: «In the past many zoos kept animals in small, bare concrete cages, but science has shown that animals need space, choice and things to do.», reached through a sentence linked to the one the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «animals» (+3). Against it: a different action (counts against) (-1); a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 5 · wrong ✗

Count it: a bumblebee bat weighs about 2 grams and a big flying fox about 1 kilogram. About how many bumblebee bats weigh the same as one flying fox?

1. About 5,000 — ← Mova's choice · score 6
2. About 50 — score 6
3. About 5 — score 6
4. About 500 — ✓ the right answer · score 6

Why: It took the question to ask what it is done to. 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 186, line 8: «The bumblebee bat, about the size of a big bumblebee and weighing about two grams, is one of the smallest mammals, and small bodies need little food but lose h…», reached through the remembered sentence the question matched. What matched: the same circumstance (+3); a different thing acted on (counts against) (+2); the same action «weigh» (+1). The right option, 4, scored 6. · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

What would happen to wild banana plants in a forest if all the nectar bats vanished?

1. Nothing, bananas need only rain — no support
2. Fewer of their flowers would be pollinated, so fewer seeds — ← Mova's choice · ✓ the right answer · score 1
3. They would turn into trees with no fruit at all — score 1
4. They would grow twice as fast — score -2

Why: It took the question to ask what happens next. It chose option 2 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 314, line 16: «Wild bananas, durians and agave plants are pollinated by bats; bat flowers are pale, strong-smelling and open at night, and one small nectar bat has a tongue a…», reached through the option's own match among the sentences about the question's things. What matched: the same action «pollinate» (+1). · the question and its options parsed, with trees and pragmatics

Test 7 · right ✓

A flower is pale, smells strong and opens only at night. Which animal most likely pollinates it?

1. A bat — ← Mova's choice · ✓ the right answer · score 6
2. A honey bee — score 3
3. A hummingbird — score 2
4. A butterfly — score 2

Why: It took the question to ask who or what does it. It chose option 1 with score 6, against 3 for the next best. Its support: lesson 314, line 16: «Wild bananas, durians and agave plants are pollinated by bats; bat flowers are pale, strong-smelling and open at night, and one small nectar bat has a tongue a…», reached through the same lesson line as the sentence the question matched. What matched: the same action «pollinate» (+3); it fills the role the question asks for (+2); the same doer «bats» (+1). · the question and its options parsed, with trees and pragmatics

Test 8 · right ✓

Why would a bat with white fur hide well under a leaf?

1. Light through the leaf makes the white fur look green — ← Mova's choice · ✓ the right answer · score 8
2. White fur is invisible in bright sunlight, like glass — no support
3. The leaf paints the fur every day — no support
4. Snakes cannot see the colour white — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 8, the only option with support. Its support: lesson 314, line 14: «Tent-making bats bite along a big leaf so it folds down into a tent that keeps off rain and hides them; Honduran white bats sleep under leaves where green ligh…», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+3); the same doer «green light» (+3); the same thing acted on «white fur» (+2). · the question and its options parsed, with trees and pragmatics

Test 9 · right ✓

«bats are just flying mice innit» What is right?

1. No, bats are a separate group of mammals, not mice — ← Mova's choice · ✓ the right answer · score 7
2. Yes, bats are just mice that grew wings when they got old — no support
3. Yes, mice turn into bats when old — no support
4. No, bats are birds with fur — 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 153, line 13: «Bats are the only mammals that can truly fly, and about one in five of all mammal kinds is a bat.», reached through the same lesson line as the sentence the question matched. What matched: the same circumstance (+3); the same light verb (be, have, do, get, go) (+2); the same doer «bats» (+1); a different thing acted on (counts against) (+1). · the question and its options parsed, with trees and pragmatics

Test 10 · wrong ✗

What would happen if a bat's toes needed muscles to stay shut?

1. It could hang even longer — ← Mova's choice · no support
2. It would get tired hanging, like you on a climbing frame — ✓ the right answer · no support
3. It would fly higher — no support
4. It would have to sleep standing up on the branch like a bird — 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 · right ✓

«the vet says vampire bat spit might help ppl, how» What is the answer?

1. It turns blood into water — no support
2. It cures toothache in one day — no support
3. It stops blood going thick and sticky, which scientists study for medicines — ← Mova's choice · ✓ the right answer · score 9
4. It makes people grow wings — no support

Why: It took the question to ask what something is like. It chose option 3 with score 9, the only option with support. Its support: lesson 314, line 10: «Vampire bat spit stops blood going thick and sticky, so the cut keeps flowing, and scientists have studied it to make new medicines.», reached through the same lesson line as the sentence the question matched. What matched: the same action «study» (+5); the same doer «scientists» (+4). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the structure that supports the membrane of a bat's wing.

1. Cartilaginous rods unconnected with the hand — ← Mova's choice · no support
2. A series of feathers anchored in the skin — no support
3. A single elongated bone extending from the shoulder — no support
4. Four elongated digits of the forelimb, with the thumb remaining short and clawed — ✓ 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 ✗

Select the response consistent with the established facts concerning the feeding of vampire bats.

1. They feed principally upon human beings in Europe — no support
2. They feed exclusively upon the nectar of night-flowering plants of the tropical forests — ← Mova's choice · score 5
3. They extract blood by suction through hollow canine teeth — no support
4. They inflict a small incision and lap the blood, chiefly of cattle, horses and birds — ✓ the right answer · score 4

Why: It took the question to ask which statement is true. It chose option 2 with score 5, against 4 for the next best. Its support: lesson 153, line 15: «Some bats feed on fruit and nectar and, like bees, carry pollen between flowers and spread seeds; the wild ancestors of bananas and the agave are pollinated by…», reached through the option's own match among the sentences about the question's things. What matched: the same action «feed» (+3); the same circumstance (+3). Against it: a different doer (counts against) (-1). The right option, 4, scored 4. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Which of the following statements most accurately characterises Kitti's hog-nosed bat?

1. It weighs approximately two kilograms and ranks among the largest of bats — score 7
2. It is a fruit bat with wings exceeding one metre in span — score 8
3. It is a species of bird mistakenly classified as a bat — score 5
4. It weighs approximately two grams and ranks among the smallest of mammals — ← Mova's choice · ✓ the right answer · score 9

Why: It took the question to ask who or what does it. It chose option 4 with score 9, against 8 for the next best. Its support: lesson 314, line 13: «Kitti's hog-nosed bat, the bumblebee bat of Thailand and Myanmar, weighs about 2 grams and is one of the smallest mammals, along with the Etruscan shrew.», reached through the same lesson line as the sentence the question matched. What matched: the same action «weigh» (+3); the same thing acted on «2 grams» (+3); it fills the role the question asks for (+2); the same doer «nosed bat» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

Ascertain the reason for which a bat expends little effort when hanging inverted.

1. Tendons lock the toes in a closed position without muscular effort — ← Mova's choice · ✓ the right answer · score 6
2. The bat grips continuously with its teeth — score 2
3. The bat's weight is supported by its folded wings — no support
4. The bat adheres to surfaces by means of a sticky secretion — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 2 for the next best. Its support: lesson 314, line 15: «Bats hang by their feet with tendons that lock their toes shut, so hanging takes no effort, and they drop into the air to take off because their legs are too w…», reached through the same lesson line as the sentence the question matched. What matched: the same action «lock» (+4); the same doer «tendons» (+1); the same thing acted on «toes» (+1). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/314-bats-of-the-world-flying-foxes-vampire-bats-the-bumblebee-bat-and-tent-makers/