Nonhatching eggs and more than one possible cause

Tests: 1 of 5 right · Exam: 1 of 3 right · Kind: plain · Understood: 7 of 8 · Run: 2026-11-05, commit 610eccd1d

Lesson 414 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.

Test 1 · wrong ✗

A record confirms that an egg was fertilised, yet it did not hatch. Which statement fits the lesson?

1. Development can still fail after fertilisation — ✓ the right answer · no support
2. Fertilised eggs always hatch, so the record is wrong — no support
3. The egg must have been unfertilised after all — no support
4. The shell's colour must have stopped the hatch — ← Mova's choice · score 3

Why: It took the question to ask who or what does it. It chose option 4 with score 3, the only option with support. Its support: lesson 414, line 9: «A shell's colour alone does not establish whether an egg was fertilised.», 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 doer «colour» (+1). The right option, 1, found no support in what it remembers.

Test 2 · wrong ✗

Two eggs fail to hatch. One was unfertilised; the other had an embryo that stopped developing. What does this show?

1. Both must have had the same history — ← Mova's choice · no support
2. The same outcome can have different causes — ✓ the right answer · no support
3. Neither could ever have contained an embryo — no support
4. Shell colour determines every outcome — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown.

Test 3 · right ✓

A story character claims to make eggs produce young by magic. How should that be used in biology?

1. As proof of a real mechanism — no support
2. As a fictional prompt — ← Mova's choice · ✓ the right answer · score 2
3. As a substitute for observation — no support
4. As a guarantee for every egg — no support

Why: It took the question to ask what something is like. It chose option 2 with score 2, the only option with support. Its support: lesson 414, line 1: «In Where Animals Talk, a speaker complains that eggs produced no young, and Tortoise claims a special power. Those fictional claims are prompts for questions,…», reached through the same lesson line as the sentence the question matched. What matched: the same circumstance (+2); it fills the role the question asks for (+2). Against it: a different thing acted on (counts against) (-2).

Test 4 · wrong ✗

Most shop eggs were not fertilised. Which statement preserves that scope?

1. Every purchased egg is an embryo — no support
2. Most cannot hatch for that reason — ✓ the right answer · no support
3. No purchased egg could ever be fertilised — ← Mova's choice · score 6
4. Every hen needs a cockerel to lay — score 2

Why: It took the question to ask which statement is true. It chose option 3 with score 6, against 2 for the next best. Its support: lesson 414, line 9: «A shell's colour alone does not establish whether an egg was fertilised.», reached through the remembered sentence the question matched. What matched: the same thing acted on «egg» (+4); the same action «fertilis» (+2). The right option, 2, found no support in what it remembers.

Test 5 · wrong ✗

An egg does not hatch and its shell is white. Which conclusion is justified?

1. The egg certainly contained a healthy chick — score -2
2. White shells prevent embryos — no support
3. The cause remains uncertain — ✓ the right answer · score 3
4. The egg certainly was never fertilised — ← Mova's choice · score 7

Why: It took the question to ask who or what does it. It chose option 4 with score 7, against 3 for the next best. Its support: lesson 414, line 9: «A shell's colour alone does not establish whether an egg was fertilised.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «egg» (+3); the same action «fertilis» (+2); one says «not», the other does not (counts against) (+2). The right option, 3, scored 3.

Exam question 1 · formal language · wrong ✗

A record confirms that an embryo began developing, but no chick hatched. Which claim contradicts the record?

1. Development stopped after beginning — score 5
2. Suitable development failed later — ← Mova's choice · score 10
3. No embryo began developing — ✓ the right answer · score 4
4. The embryo did not remain viable — score 8

Why: It took the question to ask who or what does it. It chose option 2 with score 10, against 8 for the next best. Its support: lesson 414, line 8: «Development may fail even after an embryo has begun to form.», reached through a sentence linked to the one the question matched. What matched: the same action «fail» (+5); it fills the role the question asks for (+3); the same doer «development» (+2). The right option, 3, scored 4.

Exam question 2 · formal language · wrong ✗

Two eggs did not hatch; an earlier record shows that only one had begun developing an embryo. Why keep that earlier record?

1. It makes shell colour determine fertilisation — no support
2. It proves both eggs had the same history — no support
3. It guarantees that both eggs will later hatch — ← Mova's choice · score 0
4. It preserves a difference hidden by the shared final outcome — ✓ the right answer · no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 0, the only option with support. Its support: lesson 330, line 5: «Stick insects rock like twigs in the wind so hunters ignore them, they eat leaves such as bramble or privet, and many pet stick insects lay eggs that hatch wit…», reached through the option's own match among the sentences about the question's things. What matched: the same action «hatch» (+1). Against it: the same doer «eggs» (-1). The right option, 4, found no support in what it remembers.

Exam question 3 · formal language · right ✓

A record notes only that a hen laid an egg today. What does that record alone establish?

1. That the egg was fertilised — score 3
2. That the hen laid an egg — ← Mova's choice · ✓ the right answer · score 8
3. That the egg will later hatch — no support
4. That a chick has begun developing — score 6

Why: It took the question to ask what it is done to. It chose option 2 with score 8, against 6 for the next best. Its support: lesson 414, line 2: «A hen can lay an egg without fertilisation. An unfertilised hen's egg cannot develop into a chick; laying an egg and starting a chick's development are differe…», reached through the remembered sentence the question matched. What matched: the same action «lay» (+5); it fills the role the question asks for (+2); the same doer «hen» (+1).

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/414-nonhatching-eggs-and-more-than-one-possible-cause/

📝 Nonhatching eggs and more than one possible cause