Underground Network Pop Quiz
Pop Quiz Reading Comprehension • Life Science
Underground Network
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Reading Passage: The Wood Wide Web
Read carefully before answering
[1] Beneath the silent floor of an old-growth forest lies an intricate biological internet. Trees do not grow in isolation; rather, they are physically intertwined by vast webs of mycorrhizal fungi. These subterranean filaments, known as hyphae, fuse directly with tree root tips, forming a symbiotic super-highway that can span hundreds of square kilometers beneath the soil.
[2] In this mutualistic partnership, both species thrive through resource exchange. Trees synthesize carbon-rich sugars through photosynthesis, transferring up to thirty percent of these carbohydrates downward to sustain the underground fungi. In return, the expansive fungal threads absorb moisture, phosphorus, and vital minerals from deep soil crevices that tree roots could never access alone.
[3] Beyond basic nutrition, this fungal lattice serves as an emergency communication grid. When an insect pest attacks a host tree, that tree discharges biochemical warning signals through the fungal network. Neighboring trees detect this distress call within hours and immediately begin producing protective defensive enzymes and bitter tannins before pests arrive. Older "mother trees" also route surplus carbon to shaded saplings in the understory, sustaining the vitality of the entire forest canopy.
1 Part 1: Multiple Choice
3 points each • 9 pts total
Circle the letter corresponding to the single best answer based directly on the passage.
1. What is the central idea of the passage?
A. Fungi slowly decay tree roots to clear land for new saplings.
B. Trees and fungi form an underground network to share resources and signals.
C. Insects use mycorrhizal threads to invade tree root systems.
D. Sunlight is the only limiting resource in forest ecosystems.
2. In Paragraph 2, the word mutualistic most nearly means:
A. Beneficial to both participating organisms
B. Fiercely competitive and harmful over time
C. Temporary and easily severed during storms
D. Unbalanced with one organism taking all nutrients
3. According to Paragraph 3, what defense mechanism do neighboring trees trigger when alerted?
A. They shed their canopy leaves to prevent egg laying.
B. They disconnect their roots from all surrounding hyphae.
C. They synthesize defensive enzymes and bitter tannins.
D. They redirect all water reserves exclusively to mother trees.
Underground Network Pop Quiz • Life Science Page 1 of 2 • Turn over for Parts 2 and 3 →
Underground Network Pop Quiz • Parts 2 & 3
Student Name: Page 2 of 2
2 Part 2: Fact Check — True or False with Text Evidence
3 points each • 6 pts total
Circle TRUE or FALSE. Then write the paragraph number and a specific fact from the text supporting your decision.
4. Statement: Fungal hyphae can absorb minerals and moisture from soil depths that tree roots cannot reach on their own.
TRUE FALSE
Paragraph #: Text Evidence:
5. Statement: Mature "mother trees" restrict nutrients from shaded saplings to eliminate competition for canopy light.
TRUE FALSE
Paragraph #: Text Evidence:
3 Part 3: Deep Dive — Short Answer Reasoning
Q6: 2 pts • Q7: 3 pts • 5 pts total
Answer in complete sentences using accurate details from the reading passage.
6. Describe the two-way exchange between trees and mycorrhizal fungi. Exactly what resource does each organism give to the other?
7. Why do ecologists describe a forest as an "interconnected community" rather than simply individual competing trees? Cite one specific piece of evidence from Paragraph 3.
Total Points: 20 • Scoring: Part 1 (9 pts), Part 2 (6 pts), Part 3 (5 pts) Double-check your evidence citations before submitting.
Underground Network Answer Key
Teacher Answer Key Scoring & Evidence Guide
Underground Network Pop Quiz
Total Assessment Value
20 Points
Standards Alignment
CCSS.ELA-RI (Key Ideas & Textual Evidence), NGSS MS-LS2 (Interactions & Energy Flow).
Pacing & Format
15–20 min pop quiz; 3 MC (9 pts), 2 T/F with citation (6 pts), 2 Short Answers (5 pts).
Grading Scale
18–20: Exceeds • 15–17: Proficient • 12–14: Developing • <12: Intervention.
1 Part 1: Multiple Choice Answers & Analysis (9 Pts)
3 points per item
Question 1: Central Idea of Passage CORRECT: B
Correct Choice (B): Trees and fungi form an underground network to share resources and signals.
Passage Citation: Paragraph [1] and [2] describe hyphae connecting roots into a "symbiotic super-highway" for resource exchange.
Distractor Logic: (A) contradicts the text; (C) falsely claims insects use hyphae; (D) ignores soil nutrients highlighted in Paragraph 2.
Question 2: Vocabulary in Context ("Mutualistic") CORRECT: A
Correct Choice (A): Beneficial to both participating organisms.
Passage Citation: Paragraph [2] directly states, "In this mutualistic partnership, both species thrive through resource exchange."
Distractor Logic: (B), (C), and (D) describe negative, unstable, or one-sided ecological relationships (parasitism or competition), which contradict the text.
Question 3: Neighboring Trees' Defensive Response CORRECT: C
Correct Choice (C): They synthesize defensive enzymes and bitter tannins.
Passage Citation: Paragraph [3] explicitly notes that upon detection, neighbors "immediately begin producing protective defensive enzymes and bitter tannins before pests arrive."
Distractor Logic: (A), (B), and (D) are fabricated mechanisms not mentioned anywhere in the passage.
Underground Network Answer Key • Teacher Reference Page 1 of 2 • Turn over for Parts 2 & 3 Rubric →
Underground Network Answer Key • Parts 2 & 3 Detailed Rubrics
Page 2 of 2
2 Part 2: Fact Check — True or False Evidence Guide (6 Pts)
3 points per item (1 pt T/F, 2 pts citation/evidence)
4. Soil depth extraction statement: TRUE (1 pt)
Required Paragraph: Paragraph [2] (1 pt)
"the expansive fungal threads absorb moisture, phosphorus, and vital minerals from deep soil crevices that tree roots could never access alone." (1 pt)
