Tail or root: observation before classification

Tests: 1 of 5 right · Exam: 0 of 3 right · Kind: plain · Understood: 7 of 8 · Run: 2026-11-05, commit 610eccd1d

Lesson 410 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 · right ✓

A clear diagram shows a long, thin structure containing small vertebrae, joined to the back end of an animal's body. Which identification fits?

1. A tree root anchoring a plant — no support
2. A tail that is part of the animal — ← Mova's choice · ✓ the right answer · score 13
3. A rootlet absorbing soil water — no support
4. An empty, discarded outer skin — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 13, the only option with support. Its support: lesson 410, line 6: «A rat's tail is a part of an animal and contains vertebrae.», reached through the same lesson line as the sentence the question matched. What matched: the same thing acted on «part» (+4); the same circumstance (+4); the same light verb (be, have, do, get, go) (+2); it fills the role the question asks for (+2).

Test 2 · wrong ✗

A drawing shows branching roots absorbing soil water. Which role is supported?

1. Carrying a bird's feathers — no support
2. Replacing an animal's bones — ← Mova's choice · score 2
3. Supplying a plant with water — ✓ the right answer · score 2
4. Cooling a rat through its tail — no support

Why: It took the question to ask what it is done to. It chose option 2 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 410, line 3: «Roots absorb water and minerals and help anchor a plant. A rat's tail contains animal tissues and bones; it is connected to the rat, not to a tree.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same thing acted on «animal tissues» (+2). Against it: a different action (counts against) (-3). The right option, 3, scored 2.

Test 3 · wrong ✗

A character says a visible rat tail is a tree root. What should a reader separate?

1. The tale from every observation — ← Mova's choice · no support
2. The name from its spelling only — no support
3. The speaker's claim from the evidence — ✓ the right answer · no support
4. Every root from living tissue — no support

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

Test 4 · wrong ✗

One blurred photograph shows a thin brown shape beside a hole. What can you conclude?

1. The picture may be insufficient to identify it — ✓ the right answer · no support
2. It certainly belongs to a rat — no support
3. It certainly belongs to a tree — no support
4. Brown objects cannot be animal parts — ← Mova's choice · score -2

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 410, line 2: «A rat's tail is part of an animal, while a tree root is a plant organ. Two things can share a long thin shape without having the same structure or function.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same thing acted on «part» (+2). Against it: the same light verb (be, have, do, get, go) (-2); one says «not», the other does not (counts against) (-5). The right option, 1, found no support in what it remembers.

Test 5 · wrong ✗

Two attached structures contain living cells, but only one contains vertebrae. Which fits a rat's tail?

1. The one absorbing soil minerals — score 3
2. The one containing vertebrae — ✓ the right answer · no support
3. The one attached to a carrot — no support
4. The one made only of root hairs — ← Mova's choice · score 4

Why: It took the question to ask who or what does it. It chose option 4 with score 4, against 3 for the next best. Its support: lesson 297, line 14: «Scientists can grow meat from animal cells in tanks without raising whole animals; it is sold in a few countries, it could use less land, but it is still expen…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «meat» (+2); the same circumstance (+2). The right option, 2, found no support in what it remembers.

Exam question 1 · formal language · wrong ✗

A root and a tail have similar lengths. Which comparison most helps explain their different functions?

1. They cast shadows of different sizes — score 3
2. Their names have different letters — ← Mova's choice · score 4
3. Their tissues and attachment to different organisms — ✓ the right answer · no support
4. They were drawn on different pages — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 4, against 3 for the next best. Its support: lesson 410, line 5: «A tree root is an organ of a plant.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «tree root» (+1). The right option, 3, found no support in what it remembers.

Exam question 2 · formal language · wrong ✗

A labelled diagram connects a thin organ to a tree and shows it absorbing soil water. Which explanation fits those observations?

1. It is a rat's tail cooling the animal — ← Mova's choice · score 3
2. It is performing a plant root's function — ✓ the right answer · no support
3. It is an animal bone holding up a limb — no support
4. It is a bird's feather moving through air — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 3, the only option with support. Its support: lesson 410, line 3: «Roots absorb water and minerals and help anchor a plant. A rat's tail contains animal tissues and bones; it is connected to the rat, not to a tree.», reached through a sentence linked to the one the question matched. What matched: it fills the role the question asks for (+3); the same doer «tail» (+2). Against it: a different action (counts against) (-1); a different thing acted on (counts against) (-1). The right option, 2, found no support in what it remembers.

Exam question 3 · formal language · wrong ✗

One photograph shows a motionless thin shape across a path. A clearer second photograph identifies it as a rat's tail. What has changed?

1. Clearer evidence identifies an animal part — ✓ the right answer · no support
2. The first photograph had already proved that it was a root — no support
3. The rat has turned a root into a tail — ← Mova's choice · score 3
4. Its stillness has proved it is a plant part — no support

Why: It took the question to ask who or what does it. It chose option 3 with score 3, the only option with support. Its support: lesson 410, line 1: «In Where Animals Talk, Rat calls a tail a root and points Leopard towards a real root. A character's words and the narrator's description are different kinds o…», 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 «animals» (+1). The right option, 1, found no support in what it remembers.

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/410-tail-or-root-observation-before-classification/

📝 Tail or root: observation before classification