---
title: Giant reptiles of the past: Titanoboa, Sarcosuchus, Deinosuchus and… — how Mova does on the tests · Biology
description: Lesson 383 of the biology course of Mova's primary school: 3 of 11 tests right, exam 0 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Giant reptiles of the past: Titanoboa, Sarcosuchus, Deinosuchus and giant tortoises

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**Tests:** 3 of 11 right · **Exam:** 0 of 4 right · **Kind:** ★ · **Understood:** 6 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 383 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](https://md.mova.elamur.ai/free/en/corpora/school/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/).

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### Test 1 · ★ · right ✓ {#t1}

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«Titanoboa was just a big python, like 6 m, chill» What is right?

- **1.** It was about twice as long, around 13 metres — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Yes, it was exactly 6 metres — no support
- **3.** It was 100 metres long, as long as a football pitch — no support
- **4.** It was shorter than a garden hose — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t1/)

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### Test 2 · ★ · wrong ✗ {#t2}

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«snakes ain't got bones, they're like jelly» What is right?

- **1.** Snakes have only a skull — score 2
- **2.** Snakes have no bones at all inside them — **← Mova's choice** · score 7
- **3.** Snakes have 33 backbone pieces, the same as people — score 3
- **4.** Snakes have a few hundred backbone pieces with ribs — **✓ the right answer** · score 3

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 7, against 3 for the next best. Its support: lesson 343, line 14: «Fish have many more small bones than mammals, such as the thin pin bones in salmon, while sharks have no bones at all, only bendy cartilage.», reached through the option's own match among the sentences about the question's things. What matched: the same place «all» (+4); the same thing acted on «bones» (+2); the same light verb (be, have, do, get, go) (+1). The right option, 4, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t2/)

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### Test 3 · ★ · wrong ✗ {#t3}

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What would happen to a giant cold-blooded snake moved to a cold country?

- **1.** It would be too cold to move and feed well — **✓ the right answer** · no support
- **2.** It would turn warm-blooded within a few years — score 1
- **3.** It would fly south — no support
- **4.** It would grow even bigger — **← Mova's choice** · score 2

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 2, against 1 for the next best. Its support: lesson 274, line 3: «Warmth and air helped: big insects breathe through tubes, which works better with more oxygen, and cold-blooded snakes like 13-metre Titanoboa can grow bigger…», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+1); the same property (+1). The right option, 1, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t3/)

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### Test 4 · ★ · wrong ✗ {#t4}

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«a croc in the Sahara?? that's made up mate» What is right?

- **1.** Someone buried the bones there as a joke to fool the scientists — **← Mova's choice** · no support
- **2.** The bones blew there in a storm — no support
- **3.** Crocodiles have always lived in sand, like lizards — no support
- **4.** The Sahara once had rivers and swamps where SuperCroc lived — **✓ the right answer** · no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t4/)

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### Test 5 · ★ · wrong ✗ {#t5}

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Count them: Archelon and a beach turtle side by side. How many flippers in all?

- **1.** Four — **← Mova's choice** · no support
- **2.** Six — no support
- **3.** Twelve — no support
- **4.** Eight — **✓ the right answer** · no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t5/)

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### Test 6 · ★ · wrong ✗ {#t6}

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In a cartoon a giant prehistoric croc wears a crown and talks. What real clue tells us what Deinosuchus ate?

- **1.** Its pictures in cave paintings — **← Mova's choice** · no support
- **2.** Bite marks from its teeth in dinosaur bones — **✓ the right answer** · no support
- **3.** Its crown shows it was king — no support
- **4.** Its words written down in very old books — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t6/)

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### Test 7 · ★ · right ✓ {#t7}

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«scientist said dunno what the snout bump was for, bad scientist lol» What is the fair view?

- **1.** Saying we don't know is honest when clues are missing — **← Mova's choice** · **✓ the right answer** · score 5
- **2.** A good scientist always knows — score 4
- **3.** They should just guess and say it is true, so people are happy — no support
- **4.** The bump never existed — no support

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**Why:** It took the question to ask a circumstance (with what, when, how). It chose option 1 with score 5, against 4 for the next best. Its support: lesson 268, line 14: «Microraptor had long feathers on its arms and legs, could glide between trees, and its feathers were shiny black like a starling's, which scientists could tell…», reached through the remembered sentence the question matched. What matched: the same action «tell» (+3); the same doer «scientists» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t7/)

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### Test 8 · ★ · wrong ✗ {#t8}

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Count them: a lizard has 4 legs and 1 tail. How many legs and tails do 3 Megalania have together?

- **1.** 12 legs and 12 tails — **← Mova's choice** · score 7
- **2.** 9 legs and 3 tails — score 7
- **3.** 12 legs and 3 tails — **✓ the right answer** · score 7
- **4.** 4 legs and 1 tail — score 7

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**Why:** It took the question to ask what it is done to. 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 30, line 1: «Snakes and lizards are reptiles with dry scaly skin; a lizard usually has four legs, while a snake has none and slides by pushing the sides of its body against…», reached through the remembered sentence the question matched. What matched: the same light verb (be, have, do, get, go) (+7); it fills the role the question asks for (+1). Against it: the same thing acted on «four legs» (-1). The right option, 3, scored 7. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t8/)

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### Test 9 · ★ · wrong ✗ {#t9}

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Which living reptile would you call a giant today?

- **1.** A grass snake that is longer than your arm — no support
- **2.** A saltwater crocodile, up to about 6 metres — **✓ the right answer** · no support
- **3.** A pet tortoise — no support
- **4.** A garden lizard — **← Mova's choice** · score -2

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**Why:** It took the question to ask what it is done to. It chose option 4 with score -2, the only option with support. Its support: lesson 379, line 15: «Some people think the Chinese alligator helped inspire dragon legends, but nobody knows for sure; Chinese dragons bring rain and live in rivers, and old books…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+2); the same thing acted on «river dragon» (+1). Against it: a different action (counts against) (-1); a different doer (counts against) (-4). The right option, 2, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t9/)

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### Test 10 · ★ · wrong ✗ {#t10}

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«turtles had horns? u lying» What is right?

- **1.** All turtles have horns today — **← Mova's choice** · no support
- **2.** Turtles never had anything like horns at all, ever, in history — no support
- **3.** Some Stupendemys shells were reported to have two horns — **✓ the right answer** · no support
- **4.** Only sea turtles have horns — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t10/)

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### Test 11 · ★ · right ✓ {#t11}

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Why do scientists compare a few giant bones with bones of living animals?

- **1.** To work out the size and shape of the whole animal — **← Mova's choice** · **✓ the right answer** · score 3
- **2.** To check the bones are not plastic toys made in a factory — score 3
- **3.** To find the animal's name — score 3
- **4.** To make the old bones grow back — score 3

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**Why:** It took the question to ask why something happens (its cause). 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 302, line 12: «An owl pellet is a ball of fur and bones the owl coughs up, not poo, because owls swallow small prey whole and cannot digest bone and fur; scientists count the…», reached through the cause of the sentence the question matched. What matched: the same doer «scientists» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/t11/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Ascertain the approximate length attributed by scientists to the serpent Titanoboa.

- **1.** Fifty metres or more — **← Mova's choice** · no support
- **2.** Three metres or less — no support
- **3.** Thirteen metres — **✓ the right answer** · no support
- **4.** One metre and a half — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Identify the principal evidence indicating that Deinosuchus preyed upon dinosaurs.

- **1.** Contemporary written accounts — **← Mova's choice** · no support
- **2.** Paintings upon the walls of caves — no support
- **3.** Tooth marks corresponding to its dentition upon fossil dinosaur bones — **✓ the right answer** · no support
- **4.** Preserved stomach contents containing feathers and fragments of bone — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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Select the response consistent with the established facts concerning the discovery of Sarcosuchus in the Sahara.

- **1.** The animal was a desert lizard — **← Mova's choice** · no support
- **2.** The fossils were transported thither by wind — no support
- **3.** Crocodiles have at all times inhabited dry sand like lizards — no support
- **4.** The region was formerly characterised by rivers and swamps — **✓ the right answer** · no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/e3/)

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### Exam question 4 · formal language · wrong ✗ {#e4}

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Which of the following statements most accurately characterises the vulnerability of giant reptiles to environmental change?

- **1.** They reproduced far too rapidly for the quantity of food available within their habitat — **← Mova's choice** · no support
- **2.** Their small size made them easy prey — no support
- **3.** Their warm blood was unsuited to heat — no support
- **4.** Their great demand for food and few offspring rendered recovery difficult — **✓ the right answer** · no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/biology/383-giant-reptiles-of-the-past-titanoboa-sarcosuchus-deinosuchus-and-giant-tortoises/e4/)

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