Food Web Puzzles

• how energy flows through food chains and interconnected food webs
• the 10% law of energy transfer and why energy pyramids are always upright
• why removing one species (a keystone species) can collapse an entire ecosystem

1. Trophic levels — producers, primary/secondary/tertiary/quaternary consumers, each level up the chain.
2. 10% law — only about 10% of energy at one trophic level is passed to the next; ~90% is lost as heat/metabolism.
3. Food web — a network of overlapping food chains showing that most organisms eat and are eaten by more than one species.
4. Keystone species — a species whose impact on the ecosystem is disproportionately large compared to its abundance.

Sea otters eat sea urchins, which eat kelp. Remove the otters and predict what happens to the kelp forest.

Step 1 — identify the chain: kelp -> sea urchins -> sea otters
Step 2 — remove otters: urchin population is no longer controlled and grows rapidly
Step 3 — urchins overgraze kelp, causing the kelp forest to collapse
Step 4 — conclude: otters are a keystone species even though they are not the most numerous organism

• Confusing a food chain (single line) with a food web (interconnected network).
• Assuming energy pyramids can be inverted like number/biomass pyramids — they cannot.
• Forgetting that omnivores can occupy more than one trophic level.

• Explain why an energy pyramid is always upright.
• Give one real example of a keystone species and predict what happens if it disappears.
• Draw a 4-level food chain and label producer/primary/secondary/tertiary consumer.

Open the Practice tab for graded questions on Food Web Puzzles.

• Use the platform-native live simulation or PhET-style tool for this topic (food-web builder, adaptation matcher, body-system diagram, classification key tool, etc.).
• Mirror / body / home activity: physically do the concept (observe local plants/animals, chart a food web from your garden, sketch a dichotomous key for household objects) and photograph or describe for portfolio.
• Voice or text reflection with AI Mentor: explain the concept to a younger student or family member.

• "Explain this concept to a Class 6 student using one real example from an Indian home, school, market, or festival."
• "What is one common mistake students make here, and how would you catch yourself making it?"
• Stretch: "How does this connect to coding, robotics, money, health, environment, or a future career?"

• Complete the core practice + one extension activity (photo, table, short reflection, or mini-project) for base XP + topic badge.
• 5-7 day streak or family discussion note = multiplier + visible artifact in parent/principal dashboard.
• Best real-world application stories (anonymised) featured on class or national leaderboard.

• One hands-on project or measurement using the Drishti kit or household items that makes the concept physical.
• Direct link to at least one Future Skill track (Money Management, Green Tech, Cyber Defenders, Micro-Entrepreneurship, AI Mastery, Sustainable Living, Personality Development).
• Coding extension where relevant (simple script, simulation, or data logging).

This material emphasises experiential "learning by doing", competency (apply/create/analyse), vocational exposure, critical thinking, and multidisciplinary connections. Designed to feed live worlds, AI Mentor (with memory), gamification, robotics, parent analytics, and future skills — not just exam prep.

Portfolio Evidence Idea: Your photo/table/reflection/project + one sentence on "How this helps me in real life or a possible future path."

Open the Practice tab for aligned questions (easy/medium/hard + case-based) with full AI scaffolding.

See curriculum for cross-links and the full future-skills/robotics chapters.