GCSE Double Award Science Biology

GCSE Double Award Science Biology Unit 1: Higher Tier Overview

1. Introduction

  • Covers fundamental concepts of Biology including cells, living processes, and biodiversity.

2. Content Overview

2.1 Cells

  • 1.1: Microscopy

  • 1.2: Photosynthesis and Plants

  • 1.3: Nutrition and Food Tests

  • 1.4: Enzymes and Digestion

  • 1.5: Respiratory System, Breathing and Respiration

  • 1.6: Nervous System and Hormones

  • 1.7: Ecological Relationships and Energy Flow

1.1 Cells

3.1 Microscopy

  • Purpose: To view animal, plant, and bacterial cells.

  • Techniques:

    • Use of light microscope, parts & functions.

    • Calculation of magnification.

  • Example: Temporary slides of onion epidermis and cheek cells.

3.2 Types of Cells

  • Animal Cells: Contains cell membrane, nucleus, cytoplasm, mitochondria.

  • Plant Cells: Includes all animal cell parts + vacuole, cell wall, and chloroplasts.

  • Bacterial Cells: Includes cell wall, cell membrane, cytoplasm, plasmid, and chromosome.

1.2 Photosynthesis

4.1 Overview

  • Plants use chloroplasts to convert light energy, carbon dioxide, and water into glucose and oxygen.

  • Word Equation: Light + Carbon Dioxide + Water → Glucose + Oxygen

  • Process: Involves light, chlorophyll, and necessary experiments.

4.2 Investigating Photosynthesis

  • Starch test in leaves: Steps include boiling, alcohol treatment, and iodine staining.

4.3 Factors Affecting Rate of Photosynthesis

  • Temperature, light intensity, carbon dioxide concentration.

  • Compensation point: Balance between photosynthesis and respiration.

5. Enzymes and Digestion

5.1 Role of Enzymes

  • Biological catalysts that speed up reactions.

  • Specificity illustrated by the lock and key model.

5.2 Types of Digestive Enzymes

  • Carbohydrases (e.g., amylase) break down starch.

  • Lipases break down fat into fatty acids and glycerol.

  • Proteases break down proteins into amino acids.

6. The Respiratory System

6.1 Gas Exchange

  • Process in animals involves diffusion through alveoli; adaptations of the alveoli.

  • In plants, gas exchange occurs in spongy mesophyll.

6.2 Breathing and Exercise

  • Increased breathing rate and depth during exercise to supply more oxygen.

7. The Nervous System

7.1 Structure and Function

  • Central Nervous System (CNS): Brain and Spinal Cord; voluntary vs reflex actions.

  • Reflex arc pathway: stimulus, receptor, sensory neurone, association neurone, motor neurone, effector.

8. Hormones and Homeostasis

8.1 Role of Hormones

  • Hormones regulate processes such as blood glucose and osmoregulation.

8.2 Diabetes Overview

  • Type 1 and Type 2 diabetes: causes and symptoms.

9. Ecology

9.1 Ecological Relationships

  • Biodiversity, population, habitat, community, ecosystems.

9.2 Energy Flow

  • Food chains and food webs: producers, primary, secondary, and tertiary consumers.

9.3 Nutrient Cycles

  • Carbon and nitrogen cycles: processes and biological significance.

9.4 Eutrophication

  • Process involving excess nutrients leading to algal blooms and oxygen depletion in aquatic environments.

10. Laboratory Skills

10.1 Practical Work

  • Investigate biological molecules and processes through experiments, using appropriate scientific methodology.