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Excretion, egestion, and plant waste gases

Excretion, egestion, and plant waste gases

Excretion is the removal from the body of waste products of metabolism, toxic substances, and substances in excess of requirements. These substances must be removed because a build-up can harm cells and disrupt normal body chemistry.

Excretion Lesson

  1. IGCSE
  2. /Biology
  3. /Excretion

Step-by-step lessons covering Edexcel IGCSE Biology Excretion for IGCSE Biology. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational cell biology and core content before moving on to the more data-heavy ecology, genetics and practical-skills topics, which carry a large share of the exam marks.