What is Biofuel?

S4-SA4-0069

Grade Level:

Class 7

Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics

Definition

What is it?

Biofuel is a type of fuel made from living things or their waste, like plants or animal dung. Unlike petrol or diesel which come from ancient fossils, biofuels are a renewable energy source.

Simple Example

Quick Example

Imagine you have a small farm in your village. Instead of buying expensive LPG cylinders for cooking, you collect cow dung and put it in a special tank called a biogas plant. This plant produces gas that you can use to cook your chai. This gas is a simple form of biofuel!

Worked Example

Step-by-Step

Let's say a school bus needs 100 litres of diesel every day. If we want to replace 10% of this with biodiesel (a type of biofuel), how much biodiesel do we need daily? --- Step 1: Find 10% of the total diesel needed. 10% of 100 litres = (10/100) * 100 litres. --- Step 2: Calculate the amount. (10/100) * 100 = 10 litres. --- Step 3: So, the school bus needs 10 litres of biodiesel daily to replace 10% of its diesel. --- Answer: 10 litres of biodiesel.

Why It Matters

Biofuels help reduce pollution and our dependence on fossil fuels, which is crucial for fighting Climate Change. Scientists and engineers in Biotechnology and Chemistry work to develop better biofuels for EVs and even for powering homes, opening up exciting career paths in sustainable energy.

Common Mistakes

MISTAKE: Thinking all fuels come from underground fossil fuels. | CORRECTION: Biofuels are made from recently living plants or animal waste, not ancient fossils.

MISTAKE: Believing biofuels don't cause any pollution at all. | CORRECTION: While generally cleaner, burning biofuels still releases some greenhouse gases, though usually less than fossil fuels.

MISTAKE: Confusing biofuel with electricity used in electric vehicles. | CORRECTION: Biofuel is a liquid or gas fuel made from organic matter, while electricity for EVs comes from power plants (which can use various sources, including renewables or fossil fuels).

Practice Questions

Try It Yourself

QUESTION: Name two common sources from which biofuels can be made. | ANSWER: Plants (like corn, sugarcane, jatropha) and animal waste (like cow dung).

QUESTION: If a village uses 50 kg of wood for cooking daily, and a new biogas plant can produce enough biofuel to replace 20% of this, how much wood is saved daily? | ANSWER: 20% of 50 kg = (20/100) * 50 = 10 kg. So, 10 kg of wood is saved daily.

QUESTION: A small car runs 10 km on 1 litre of petrol. If the car starts using a biofuel blend that is 10% biofuel and 90% petrol, and it still runs 10 km per litre of the blend, how much biofuel is used for a 100 km trip? | ANSWER: For a 100 km trip, the car uses 100 km / 10 km/litre = 10 litres of the blend. Since the blend is 10% biofuel, the amount of biofuel used is 10% of 10 litres = (10/100) * 10 = 1 litre. So, 1 litre of biofuel is used.

MCQ

Quick Quiz

Which of these is NOT a source for making biofuel?

Sugarcane

Cow dung

Crude oil

Jatropha plant

The Correct Answer Is:

Crude oil is a fossil fuel, formed over millions of years from dead organisms, not from recently living things. Sugarcane, cow dung, and jatropha plants are all sources of biomass used to make biofuels.

Real World Connection

In the Real World

In India, many villages use biogas plants, often supported by government schemes, to convert animal waste into cooking gas and electricity. Indian Railways is also exploring using biodiesel in some of its locomotives to reduce diesel consumption and lower emissions, showing how biofuels can power large transport systems.

Key Vocabulary

Key Terms

BIOMASS: Organic matter from plants or animals that can be used as fuel | RENEWABLE: A resource that can be naturally replenished or reused | FOSSIL FUELS: Fuels like coal, oil, and natural gas formed from ancient plants and animals | BIOGAS: A type of biofuel produced from the breakdown of organic matter in the absence of oxygen | BIODIESEL: A type of biofuel made from vegetable oils or animal fats

What's Next

What to Learn Next

Great job understanding biofuels! Next, you can explore 'What is Renewable Energy?' to learn about other clean energy sources like solar and wind power, and how they are different from non-renewable sources.