Key Points

Nutrition in Plants

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Key Points
Science — Curiosity · Class 7

Important Points

  • Green plants are autotrophs.
  • Photosynthesis needs chlorophyll, sunlight, water and CO₂.
  • Oxygen is released as a by-product of photosynthesis.
  • Not every plant is green — parasites and saprotrophs exist too.

Remember This

  • Photosynthesis equation — you should be able to write it from memory.
  • Cuscuta = parasite ; Pitcher plant = insectivorous ; Mushroom = saprotroph.

Exam Tips

  • Draw a simple diagram of a leaf cross-section showing chloroplasts.
  • Remember the four essentials of photosynthesis: Carbon dioxide, Water, Sunlight, Chlorophyll (CWSC).

Definitions

Autotroph
An organism that makes its own food from simple substances.
Photosynthesis
The process by which green plants make food using sunlight, water and CO₂.
Chlorophyll
The green pigment in leaves that traps sunlight.
Parasite
An organism that lives on another and takes food from it.