About Chloroplast Citadel

Defend leaf veins from pests with photon-powered defenses in this free online photosynthesis game for biology students and classrooms.

Chloroplast Citadel is a plant defense botany game modeling how vascular plants protect photosynthetic tissue against insect herbivores and pathogens. Players harvest solar photon packets to power photophosphorylation, erect cellular defenses across leaf veins and deploy chemical deterrents.

In nature, plants synthesize secondary metabolites such as volatile terpenes in resin ducts and bitter polyphenolic tannins in cell vacuoles to deter feeding. Stomatal guard cells build hydrostatic turgor pressure through potassium ion accumulation, while specialized epidermal trichomes serve as mechanical barricades. When pathogens cause acute tissue damage, systemic acquired resistance is mediated by jasmonic acid, while abscisic acid triggers localized abscission zone cleavage to discard compromised leaf segments.

Understanding botanical immune responses and stomatal physiology provides insights into agricultural crop protection, natural pest management and ecological plant-insect interactions under changing climates.

Key Science Concepts

• Photophosphorylation: Solar photon capture driving ATP and NADPH synthesis
• Guard Cell Osmoregulation: Potassium solute influx generating turgor pressure
• Secondary Metabolites: Terpenoid resins and polyphenolic tannins inhibiting herbivores
• Mechanical Defenses: Glandular epidermal trichomes serving as feeding barriers
• Hormonal Abscission Signaling: Abscisic acid (ABA) orchestrating organ detachment

What You'll Learn

• Explain how plants convert light energy into chemical fuel for defense
• Describe how biochemical deterrents like resins and tannins impair pests
• Analyze the role of hormonal signaling in systemic plant defense

Grade Level: Middle School, High School, College

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How to play

1. Harvest Photons Click falling sun packets or thylakoid light to harvest ATP energy currency.
2. Deploy Defenses Select plants from the dock and click a grid cell to plant turrets and barricades.
3. Repel Pathogens Guard cell turrets blast potassium solutes to rupture advancing pest membranes.
4. Set Sticky Traps Resin Ducts trap and slow pests while Tannin Mortars deal splash damage.
5. Jasmonate Surge Tap the Leaf Integrity gauge to trigger systemic resistance, knock back pests, cleanse blight and rescue abducted allies.
6. ABA Emergency Valves If a lane is breached, the single-use ABA trigger drops the lane to eject intruders.
7. Phyto-Boost Allies Click any planted ally with 50 ATP to cleanse blight, restore health and unleash double rapid-fire attacks.

Frequently asked questions

Is Chloroplast Citadel free to play?

Yes. Chloroplast Citadel is completely free to play in your browser. There is no download, install or account needed.

What grade level is Chloroplast Citadel for?

Chloroplast Citadel is designed for Middle School, High School, College students and works well as a classroom activity or homework.

Does Chloroplast Citadel work on phones and tablets?

Yes. Chloroplast Citadel runs in any modern browser on desktop computers, Chromebooks, tablets and phones in landscape mode.

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