🐾 SCIENCE LESSON: REPRODUCTION OF LIVING THINGS

R & K STRATEGIES AND PARENTAL CARE
Grade: 4th
Subject: Science
Duration: 1–2 hours

🎯 LEARNING OBJECTIVES

Students will be able to:

• Understand reproduction as a characteristic of living things.
• Identify different reproductive strategies (many vs few offspring).
• Differentiate between r-strategy and K-strategy (basic level).
• Recognize the importance of parental care in survival.

📘 LESSON CONTENT (STUDENT VERSION)

🌱 What is Reproduction?

Reproduction is the process by which living things produce new individuals (babies).

👉 All living things reproduce to continue their species.

🧠 TWO REPRODUCTIVE STRATEGIES

Living things use different strategies to survive.

🐟 r-STRATEGY (MANY BABIES)

Animals produce many offspring, but give little or no care.

👉 Only a few survive.

Characteristics:

• Many babies
• Small size
• Little parental care

Examples:

• Fish 🐟
• Frogs 🐸
• Insects 🐜

🐘 K-STRATEGY (FEW BABIES)

Animals produce few offspring, but give a lot of care.

👉 Most survive.

Characteristics:

• Few babies
• Bigger size
• High parental care

Examples:

• Elephants 🐘
• Humans 👨‍👩‍👧
• Dogs 🐶

❤️ PARENTAL CARE

Parental care is how parents protect and help their babies survive.

🧠 Examples of Care

• Feeding 🍼
• Protection 🛡️
• Teaching 🧑‍🏫

👉 More care = higher survival.

🧠 KEY IDEA

👉 Animals either:

• Have many babies with little care
  or
• Have few babies with a lot of care

✏️  NOTEBOOK KEY CONCEPT

Reproduction is a process by which living organisms produce new individuals. This process allows species to continue over time.

Living things use different reproductive strategies to survive. Some species produce many offspring with little parental care. This is known as the r-strategy. In this strategy, many young are born, but only a few survive.

Other species produce fewer offspring but provide a high level of parental care. This is known as the K-strategy. In this case, most of the offspring survive because they receive protection, food, and learning from their parents.

Parental care is important because it increases the chances of survival of the young.

👉 Key idea: Survival depends on the number of offspring and the level of parental care.

🎨 CLASS ACTIVITY

🖍️ Main Activity

Compare animals.

Instructions:

• Draw one r-strategy animal 🐟
• Draw one K-strategy animal 🐘
• Write:
  • Number of babies
  • Level of care

🧪 SCIENCE TASK (FOR PLATFORM SUBMISSION)

Title: Reproductive Strategies

Instructions:

1. Choose 2 animals (one r-strategy, one K-strategy).
2. Draw them.
3. Write 2 sentences:
   • One explaining number of offspring
   • One explaining parental care
4. Upload your work.

🧪 MINI WORKSHEET (MULTIPLE CHOICE 

🧠 1. INTERPRETATIVE COMPETENCE

What is reproduction?

A. Eating food
B. Producing new individuals
C. Sleeping
D. Moving

🔍 2. ANALYTICAL COMPETENCE

Which animal is most likely an r-strategy organism?

A. Elephant
B. Human
C. Fish
D. Dog

🧩 3. APPLICATION COMPETENCE

An animal has few babies and takes care of them. What strategy is it?

A. r-strategy
B. K-strategy
C. Plant strategy
D. Invertebrate strategy

💡 4. CRITICAL THINKING

Why do K-strategy animals have higher survival rates?

A. They have more babies
B. They provide more parental care
C. They are smaller
D. They live in water

📊 ASSESSMENT RUBRIC