🌍 Introduction: Why Living Beings Need Each Other

Have you ever wondered why plants and animals cannot live alone? 🌿🐘 The answer is simple — every living being depends on another living being for food, shelter, oxygen, and survival. This is called interdependence of living beings. No plant, animal, or human can survive completely alone on Earth.

In Class 5 ICSE Science, the chapter Interdependence of Living Beings — Plants and Animals teaches us how nature is connected like a giant web. Plants make food using photosynthesis, animals eat plants or other animals, decomposers recycle dead matter, and everything returns to the soil to help plants grow again. 🔄

At 📚 Dhingra Classes Nashik, we have prepared complete detailed notes with 30 solved MCQs, 15 short answer questions, and 7 long answer questions to help you understand this chapter easily and score excellent marks. 🌟

📞 Contact Dhingra Classes for expert coaching in Science for Class 5 ICSE students!

📖 PART 1: DETAILED NOTES ON INTERDEPENDENCE OF LIVING BEINGS

🌱 Section A: What is Interdependence?

Interdependence means depending on each other for survival. In nature, all living beings — plants, animals, and humans — are connected. They need each other for:

• 🍎 Food

• 💧 Water

• 🌬️ Oxygen

• 🏠 Shelter

• 🌡️ Balance in nature

Example: Plants give oxygen and food to animals. Animals give carbon dioxide and manure to plants. This give-and-take relationship is called interdependence.

🔑 Types of Interdependence:

1. Plants depend on animals 🌿➡️🐾

2. Animals depend on plants 🐾➡️🌿

3. Animals depend on other animals 🐅➡️🐇

4. Plants depend on other plants 🌳➡️🌱

5. Humans depend on both plants and animals 👨‍🌾➡️🌿🐄

🌿 Section B: How Plants Depend on Animals

Plants may seem independent, but they actually need animals in many ways:

1. 🐝 Pollination

Bees, butterflies, and birds carry pollen grains from one flower to another. This helps plants make seeds and fruits.

2. 🌰 Seed Dispersal

Animals like squirrels, birds, and monkeys eat fruits and drop seeds far away. This helps new plants grow in different places.

3. 💨 Carbon Dioxide

Animals breathe out carbon dioxide, which plants use during photosynthesis to make food.

4. 🐛 Manure and Fertilizer

Animal waste (dung) and dead animals decay and mix with soil, making it fertile for plants.

5. 🐜 Aeration of Soil

Earthworms and insects dig through the soil, making it loose and allowing air and water to reach plant roots.

6. 🦋 Protection

Some animals protect plants by eating harmful insects (e.g., ladybugs eat aphids).

🐾 Section C: How Animals Depend on Plants

Animals cannot make their own food. They depend on plants for almost everything:

1. 🍃 Food

• Herbivores (plant-eaters): Cow, goat, deer, rabbit eat grass, leaves, fruits.

• Carnivores (flesh-eaters): Lion, tiger eat other animals — but those animals also eat plants.

• Omnivores (both): Humans, bears eat plants and animals.

2. 🌬️ Oxygen

Plants release oxygen during photosynthesis. Animals need oxygen to breathe and live.

3. 🏠 Shelter

Birds build nests on trees. Monkeys live on trees. Squirrels live in tree holes. Trees give shelter to many animals.

4. 💊 Medicine

Many medicines come from plants — tulsi, neem, aloe vera, and ginger. Animals also get cured by eating certain plants.

5. 🌳 Shade and Coolness

Trees give shade to animals and keep the environment cool.

6. 🧵 Materials

Plants give wood, cotton, rubber, and paper used by humans and animals.

🔄 Section D: Food Chain and Food Web

🌾 Food Chain

A food chain shows how energy passes from one living being to another through eating.

Example:
🌿 Grass ➡️ 🦗 Grasshopper ➡️ 🐸 Frog ➡️ 🐍 Snake ➡️ 🦅 Eagle

Parts of a Food Chain:

1. Producers 🌱 — Green plants that make food

2. Primary Consumers 🐛 — Herbivores (eat plants)

3. Secondary Consumers 🐸 — Carnivores (eat herbivores)

4. Tertiary Consumers 🦅 — Top carnivores

5. Decomposers 🍄 — Fungi and bacteria that break down dead matter

🕸️ Food Web

A food web is many food chains connected together. It shows that animals eat more than one type of food.

Example: A frog eats grasshoppers, flies, and small insects. A snake eats frogs and rats. This network is a food web.

🍄 Section E: Decomposers — The Cleaners of Nature

Decomposers are living beings that break down dead plants and animals.

Examples: 🍄 Fungi, 🦠 Bacteria, 🪱 Earthworms

Importance:

• They clean the environment.

• They return nutrients to the soil.

• They help plants grow again.

Without decomposers, dead bodies would pile up everywhere! 😱

🌳 Section F: Balance in Nature

Balance in nature means all living beings live in harmony. If one type of living being increases or decreases too much, the balance breaks.

Example:

• If all frogs die, grasshoppers will increase and eat all crops.

• If all snakes die, rats will increase and destroy grain.

So, every living being has a role in keeping nature balanced. 🌍

🧑‍🌾 Section G: How Humans Affect Interdependence

Humans are also part of nature. But sometimes our actions disturb the balance:

Harmful Activities:

• ❌ Cutting trees (deforestation)

• ❌ Hunting animals

• ❌ Polluting rivers and air

• ❌ Using too many pesticides

Good Activities:

• ✅ Planting trees

• ✅ Protecting wildlife

• ✅ Saving water

• ✅ Recycling waste

At 📚 Dhingra Classes Nashik, we teach students to become friends of nature! 🌳💚

📝 PART 2: 30 SOLVED MULTIPLE CHOICE QUESTIONS (MCQs)

Q1. The relationship in which living beings depend on each other is called:
(a) Independence (b) Interdependence (c) Competition (d) Isolation

✅ Answer: (b) Interdependence

Q2. Plants make their food by the process of:
(a) Respiration (b) Photosynthesis (c) Digestion (d) Transpiration

✅ Answer: (b) Photosynthesis

Q3. Which gas do plants release during photosynthesis?
(a) Carbon dioxide (b) Nitrogen (c) Oxygen (d) Hydrogen

✅ Answer: (c) Oxygen

Q4. Animals that eat only plants are called:
(a) Carnivores (b) Herbivores (c) Omnivores (d) Decomposers

✅ Answer: (b) Herbivores

Q5. Animals that eat both plants and animals are called:
(a) Herbivores (b) Carnivores (c) Omnivores (d) Producers

✅ Answer: (c) Omnivores

Q6. The transfer of pollen from one flower to another is called:
(a) Fertilization (b) Pollination (c) Germination (d) Dispersal

✅ Answer: (b) Pollination

Q7. Which of these helps in pollination?
(a) Bees (b) Butterflies (c) Birds (d) All of these

✅ Answer: (d) All of these

Q8. Green plants are called:
(a) Consumers (b) Producers (c) Decomposers (d) Predators

✅ Answer: (b) Producers

Q9. A food chain always starts with:
(a) Animals (b) Green plants (c) Fungi (d) Bacteria

✅ Answer: (b) Green plants

Q10. In the food chain Grass ➡️ Grasshopper ➡️ Frog ➡️ Snake, the frog is a:
(a) Producer (b) Primary consumer (c) Secondary consumer (d) Decomposer

✅ Answer: (c) Secondary consumer

Q11. Which of the following is a decomposer?
(a) Cow (b) Fungi (c) Lion (d) Grass

✅ Answer: (b) Fungi

Q12. Decomposers help in:
(a) Making food (b) Breaking down dead matter (c) Flying (d) Swimming

✅ Answer: (b) Breaking down dead matter

Q13. Animals breathe out which gas that plants use?
(a) Oxygen (b) Nitrogen (c) Carbon dioxide (d) Hydrogen

✅ Answer: (c) Carbon dioxide

Q14. Which animal helps in seed dispersal?
(a) Squirrel (b) Bird (c) Monkey (d) All of these

✅ Answer: (d) All of these

Q15. Earthworms help plants by:
(a) Eating leaves (b) Loosening the soil (c) Flying (d) Making nests

✅ Answer: (b) Loosening the soil

Q16. A network of many food chains is called a:
(a) Food web (b) Food pyramid (c) Food plate (d) Food circle

✅ Answer: (a) Food web

Q17. Which of these gives shelter to birds?
(a) Trees (b) Rivers (c) Rocks (d) Clouds

✅ Answer: (a) Trees

Q18. Humans depend on plants for:
(a) Food (b) Oxygen (c) Medicine (d) All of these

✅ Answer: (d) All of these

Q19. Cutting down of trees is called:
(a) Afforestation (b) Deforestation (c) Reforestation (d) Plantation

✅ Answer: (b) Deforestation

Q20. Which of these is a herbivore?
(a) Lion (b) Tiger (c) Cow (d) Eagle

✅ Answer: (c) Cow

Q21. Which of these is a carnivore?
(a) Deer (b) Rabbit (c) Lion (d) Goat

✅ Answer: (c) Lion

Q22. Plants need which gas for photosynthesis?
(a) Oxygen (b) Carbon dioxide (c) Nitrogen (d) Hydrogen

✅ Answer: (b) Carbon dioxide

Q23. The balance in nature is maintained by:
(a) Only plants (b) Only animals (c) All living beings (d) Only humans

✅ Answer: (c) All living beings

Q24. If all frogs die, which animal will increase?
(a) Grasshopper (b) Snake (c) Eagle (d) Cow

✅ Answer: (a) Grasshopper

Q25. Which of these is a top carnivore in a food chain?
(a) Grass (b) Grasshopper (c) Frog (d) Eagle

✅ Answer: (d) Eagle

Q26. Which medicine comes from plants?
(a) Tulsi (b) Neem (c) Aloe vera (d) All of these

✅ Answer: (d) All of these

Q27. Animals that eat dead animals are called:
(a) Herbivores (b) Scavengers (c) Producers (d) Omnivores

✅ Answer: (b) Scavengers

Q28. Which of these is NOT a decomposer?
(a) Fungi (b) Bacteria (c) Earthworm (d) Lion

✅ Answer: (d) Lion

Q29. Planting trees is called:
(a) Deforestation (b) Afforestation (c) Pollution (d) Hunting

✅ Answer: (b) Afforestation

Q30. The main source of energy for all living beings is:
(a) Moon (b) Sun (c) Stars (d) Wind

✅ Answer: (b) Sun

✍️ PART 3: 15 SOLVED SHORT ANSWER QUESTIONS

Q1. What is interdependence?

✅ Answer: Interdependence means living beings depending on each other for food, water, oxygen, shelter, and survival.

Q2. Name two ways in which plants depend on animals.

✅ Answer: (1) Animals help in pollination. (2) Animals help in seed dispersal.

Q3. Name two ways in which animals depend on plants.

✅ Answer: (1) Animals get food from plants. (2) Animals get oxygen from plants.

Q4. What is photosynthesis?

✅ Answer: Photosynthesis is the process by which green plants make food using sunlight, water, and carbon dioxide.

Q5. What is a food chain?

✅ Answer: A food chain shows how energy passes from one living being to another through eating. Example: Grass ➡️ Grasshopper ➡️ Frog ➡️ Snake.

Q6. What is a food web?

✅ Answer: A food web is a network of many food chains connected together.

Q7. Who are producers?

✅ Answer: Producers are green plants that make their own food by photosynthesis.

Q8. Who are consumers?

✅ Answer: Consumers are animals that depend on plants or other animals for food.

Q9. Who are decomposers?

✅ Answer: Decomposers are living beings like fungi, bacteria, and earthworms that break down dead plants and animals.

Q10. Why are decomposers important?

✅ Answer: Decomposers clean the environment and return nutrients to the soil for plants.

Q11. What is pollination?

✅ Answer: Pollination is the transfer of pollen grains from one flower to another, helped by bees, butterflies, and birds.

Q12. What is seed dispersal?

✅ Answer: Seed dispersal is the spreading of seeds to new places by animals, wind, or water.

Q13. Name two herbivores and two carnivores.

✅ Answer: Herbivores: Cow, goat. Carnivores: Lion, tiger.

Q14. How do humans disturb the balance in nature?

✅ Answer: Humans disturb nature by cutting trees, hunting animals, polluting rivers, and using pesticides.

Q15. How can we protect the balance in nature?

✅ Answer: We can protect nature by planting trees, saving water, protecting wildlife, and recycling waste.

📖 PART 4: 7 SOLVED LONG ANSWER QUESTIONS

Q1. Explain how plants and animals depend on each other.

✅ Answer:
Plants depend on animals for:

• Pollination by bees and butterflies

• Seed dispersal by birds and squirrels

• Carbon dioxide breathed out by animals

• Manure from animal waste

Animals depend on plants for:

• Food (herbivores eat plants)

• Oxygen released by plants

• Shelter in trees

• Medicine from plants

Thus, plants and animals are interdependent and cannot live without each other. 🌿🐾

Q2. What is a food chain? Explain with an example and its parts.

✅ Answer:
A food chain shows how energy passes from one living being to another through eating.

Example: 🌿 Grass ➡️ 🦗 Grasshopper ➡️ 🐸 Frog ➡️ 🐍 Snake ➡️ 🦅 Eagle

Parts:

1. Producers 🌱 — Green plants

2. Primary Consumers 🐛 — Herbivores

3. Secondary Consumers 🐸 — Carnivores eating herbivores

4. Tertiary Consumers 🦅 — Top carnivores

5. Decomposers 🍄 — Break down dead matter

Q3. What is a food web? How is it different from a food chain?

✅ Answer:
A food web is a network of many food chains connected together. It shows that animals eat more than one type of food.

Difference:

• Food chain: Single straight path of energy.

• Food web: Many interconnected food chains.

Example of food web: A frog eats grasshoppers, flies, and insects. A snake eats frogs and rats. This network is a food web.

Q4. Explain the role of decomposers in nature.

✅ Answer:
Decomposers like fungi, bacteria, and earthworms break down dead plants and animals.

Role:

• Clean the environment 🧹

• Return nutrients to the soil 🌱

• Help plants grow again 🌿

• Prevent dead bodies from piling up

Without decomposers, life on Earth would be impossible. 🍄

Q5. Why is balance in nature important? What happens if it is disturbed?

✅ Answer:
Balance in nature means all living beings live in harmony. It is important because:

• Every living being has a role.

• If one type increases or decreases, others are affected.

If disturbed:

• If frogs die, grasshoppers increase and eat crops.

• If snakes die, rats increase and destroy grain.

• If trees are cut, animals lose shelter and oxygen.

Thus, we must protect the balance in nature. 🌍

Q6. How do human activities affect interdependence in nature?

✅ Answer:
Harmful activities:

• ❌ Cutting trees (deforestation)

• ❌ Hunting animals

• ❌ Polluting rivers and air

• ❌ Using pesticides

Effects:

• Animals lose homes

• Plants lose pollinators

• Food chains break

• Climate changes

Good activities:

• ✅ Planting trees

• ✅ Protecting wildlife

• ✅ Saving water

• ✅ Recycling waste

Q7. Explain the importance of the sun in the interdependence of living beings.

✅ Answer:
The sun is the main source of energy for all living beings. 🌞

Importance:

• Plants use sunlight for photosynthesis to make food.

• Animals eat plants or other animals that eat plants.

• So energy flows: Sun ➡️ Plants ➡️ Animals ➡️ Humans.

• Without the sun, no food, no oxygen, no life.

Thus, the sun is the starting point of every food chain. 🌿🐾

📞 Contact Dhingra Classes Today!
📍 Address: Plot No 3, XQ3G+H3M Deacon Homes, 301C, opp. Metro Zone, near Guru Govind Sing, Samarth Nagar, Dnyaneshwar Nagar, Pathardi Phata, Nashik, Maharashtra 422009

📱 Phone: 98230 62106

🌐 Website: https://www.dhingraclassesnashik.com/

📧 Email: dhingraclassesnsk@gmail.com