Transport in Plants and Animals IGCSE Biology: Complete Guide

🌱 Understanding Transport Systems in IGCSE Biology

Transport systems are essential for moving materials in living organisms. This guide covers plant and animal transport with memory techniques and exam tips.

🧠 Memory Tips

Plant Transport: “Xylem Water Up, Phloem Food Down”

• Xylem: Water and minerals upward
• Phloem: Food (sugars) up and down

Heart Chambers: “Two Atria Top, Two Ventricles Bottom”

• Atria: Receive blood (thin walls)
• Ventricles: Pump blood (thick walls)

📚 Plant Transport

Xylem Transport

• Function: Water and mineral transport
• Direction: Roots to leaves (upward)
• Mechanism: Transpiration pull
• Structure: Dead cells, lignin walls

Phloem Transport

• Function: Sugar transport
• Direction: Bidirectional
• Mechanism: Active transport
• Structure: Living cells, sieve tubes

Transpiration

• Definition: Water loss from leaves
• Factors: Temperature, humidity, wind, light
• Benefits: Cooling, mineral transport, support

🫀 Animal Transport

Blood Components

• Red blood cells: Oxygen transport
• White blood cells: Immune defense
• Platelets: Blood clotting
• Plasma: Liquid medium

Heart Structure

• Four chambers: 2 atria, 2 ventricles
• Valves: Prevent backflow
• Double circulation: Pulmonary and systemic

Blood Vessels

• Arteries: Carry blood from heart
• Veins: Carry blood to heart
• Capillaries: Exchange vessels

🎯 Exam Tips

Common Questions:

1. Compare xylem and phloem (4 marks)
2. Explain heart function (6 marks)
3. Describe transpiration factors (5 marks)

Key Equations:

• Rate of transpiration ∝ Temperature
• Blood pressure = Force/Area

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