Life Processes Cheat Sheet

Key Definitions

• Life Processes: Basic functions essential for maintaining life (e.g., nutrition, respiration).

• Nutrition: Process of obtaining and utilizing food.

• Respiration: Chemical process of breaking down food to release energy.

• Excretion: Removal of waste products from the body.

• Reproduction: Biological process of producing new organisms.

Important Concepts

Nutrition

• Autotrophic Nutrition: Organisms synthesize their own food (e.g., plants).

• Heterotrophic Nutrition: Organisms obtain food from other sources (e.g., animals).

Respiration

• Aerobic Respiration: Requires oxygen (C6H12O6 + 6O2 → 6CO2 + 6H2O + energy).

• Anaerobic Respiration: Occurs without oxygen (e.g., fermentation).

Excretion

• Nitrogenous Waste: Urea, uric acid, and ammonia as waste products.

• Organs Involved: Kidneys, lungs, skin.

Reproduction

• Asexual Reproduction: Offspring arise from a single organism (e.g., binary fission).

• Sexual Reproduction: Involves two parents and gamete fusion.

Key Formulas

• Photosynthesis:

• Respiration:

Common Mistakes to Avoid

Common Mistake: Confusing aerobic with anaerobic respiration; remember the oxygen requirement.

Memory Tricks

Tip: "N.R.E.R" — Nutrition, Respiration, Excretion, Reproduction.

Key Diagrams

Nutrition Cycle:
  Plants -> Photosynthesis -> Glucose
  Animals -> Ingestion -> Energy

Respiration Process:
  Glucose + O2 -> CO2 + H2O + Energy