Nutrition in Plants 7 Science — Revision Notes
Plants are autotrophs that produce their own food through photosynthesis using sunlight, water, and carbon dioxide. Understanding plant nutrition is fundam
TL;DR: Plants are autotrophs that produce their own food through photosynthesis using sunlight, water, and carbon dioxide. Understanding plant nutrition is f…
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Plants are autotrophs that produce their own food through photosynthesis using sunlight, water, and carbon dioxide. Understanding plant nutrition is fundam
Key Points to Remember
- Photosynthesis is the process by which plants produce glucose using sunlight, carbon dioxide, and water
- Chlorophyll is the green pigment in chloroplasts that captures light energy
- Light-dependent reactions occur in the thylakoid membranes and produce ATP and NADPH
- Light-independent reactions or Calvin cycle occur in the stroma and produce glucose
- Carbon dioxide is absorbed through stomata, pores on plant leaves
- Water is absorbed by roots and transported to leaves through the xylem
- Glucose produced in photosynthesis is used for plant growth and respiration
- Heterotrophs are organisms that depend on autotrophs for food
- Saprophytes are organisms that feed on dead organic matter through decomposition
- Parasites feed on living host organisms, harming them in the process
- Nitrogen, phosphorus, and potassium are essential mineral nutrients for plants
- Root nodules in legumes contain bacteria that fix atmospheric nitrogen
Important Formulas
- Photosynthesis: 6CO₂ + 6H₂O + Light → C₆H₁₂O₆ + 6O₂
Key Terms
- Photosynthesis: Process by which plants produce glucose from carbon dioxide and water using light energy
- Chlorophyll: Green pigment in chloroplasts that absorbs light energy for photosynthesis
- Autotroph: Organism that produces its own food from inorganic substances
- Heterotroph: Organism that depends on other organisms for food
- Stomata: Pores on plant leaves through which gas exchange and transpiration occur
- Chloroplast: Organelle in plant cells where photosynthesis takes place
Frequently Asked Questions
Why are plants called autotrophs?
Plants are autotrophs because they can produce their own food through photosynthesis using sunlight, carbon dioxide, and water, without depending on other organisms
What is the role of chlorophyll in photosynthesis?
Chlorophyll is the green pigment that captures light energy and converts it into chemical energy in the form of ATP and NADPH, which are used to produce glucose
How do nitrogen-fixing bacteria help plants?
Nitrogen-fixing bacteria in root nodules convert atmospheric nitrogen into ammonia compounds that plants can absorb and use for protein synthesis
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