🔬 Chapter 10 — Life Processes in Plants
Class 7 Science | Curiosity | EduGrown Notes
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🌿 Life Processes in Plants — How plants make their own food!
🌿 Photosynthesis — Plants Make Their Own Food!
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🌿Photosynthesis = process by which plants make their own food using sunlight, water, and CO₂
🧪Equation: CO₂ + Water + Sunlight → Glucose (food) + Oxygen
🍃Takes place in leaves — the "food factories" of plants
💚Chlorophyll = green pigment in leaves that captures sunlight for photosynthesis
📦Food is stored as starch (carbohydrate) in plants
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🌿 Leaves are the food factories — broad and flat to capture sunlight!
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☀️ Sunlight + water + CO₂ = food + oxygen for the planet!
☀️ What Plants Need for Photosynthesis
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☀️ Sunlight
→Energy source for photosynthesis
→Without light → plant cannot make food → turns yellow, wilts
💧 Water
→Absorbed by roots from soil
→Without water → plant wilts and dies
💨 Carbon Dioxide
→Enters leaves through tiny pores called stomata
→Present in the air we breathe out!
💚 Chlorophyll
→Green pigment in leaves — captures sunlight
→Without chlorophyll → no photosynthesis (variegated leaves)
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🧪 Testing for starch in leaves — iodine test!
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🌿 Stomata — tiny pores where CO₂ enters and O₂ exits
🌱 How Plants Absorb Water & Minerals
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🌱Roots absorb water and minerals from the soil through root hair cells (extremely thin, hair-like extensions)
🌊Water moves up from roots to leaves through xylem — tiny tube-like vessels inside the stem
🌿Food (made in leaves) moves to all parts of the plant through phloem
🪲 Other Modes of Plant Nutrition
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🌸Autotrophs = plants that make their own food (auto = self, troph = food) via photosynthesis
🪲Insectivorous plants = plants that trap and digest insects for nutrients! (e.g., Venus flytrap, pitcher plant)
🌾Parasitic plants = plants that steal food from host plants (e.g., Cuscuta/Amarbel)
🍄Saprophytes = organisms that feed on dead/decaying matter (e.g., fungi, some bacteria)
💡 Why are Plants So Important?
🌍 Plants produce all the oxygen we breathe through photosynthesis!
🍎 Plants are the base of all food chains — directly or indirectly feed all animals!
🌡️ Plants absorb CO₂ — helping control climate change
💧 Plants help the water cycle through transpiration
Trees planted = future secured! 🌳
🍎 Plants are the base of all food chains — directly or indirectly feed all animals!
🌡️ Plants absorb CO₂ — helping control climate change
💧 Plants help the water cycle through transpiration
Trees planted = future secured! 🌳
⭐ Quick Summary
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📝 Key Points
🌿Photosynthesis: CO₂ + H₂O + Sunlight → Glucose + O₂ (in chlorophyll-containing leaves)
💚Chlorophyll = green pigment that captures sunlight | Stomata = pores for gas exchange
🌱Roots absorb water/minerals → Xylem carries water up → Phloem carries food down
🪲Other nutrition: Insectivorous (traps insects), Parasitic (steals from host), Saprophytic (dead matter)