Schooling Courses

Crash Course Biology

Free

51 video lectures (10h 48m)
Certificate of completion
Ask the teacher your doubts
Watch on the web and in the Android app
Learn more

About this course

A fun, fast-paced tour of modern biology from Crash Course, from ecology and evolution to cells, DNA and genetics, and how plants and animals work. Who it's for: school students (Class 9 to 12), NEET beginners who want the big picture first, and anyone curious about life science. These are the free, official videos of the Crash Course Biology playlist from the CrashCourse YouTube channel (youtube.com/@crashcourse). All videos belong to Crash Course; Sikhami is not affiliated with Crash Course and simply arranges the public playlist into a course, so you can learn one lesson at a time and keep track of your progress.

What you will learn

• What biology is, the scientific method and how life is organised • Ecology, climate change and conservation • Evolution, natural selection, speciation and the tree of life • Biological molecules and the cell: membranes, cell signalling, respiration and photosynthesis • Mitosis and meiosis, genetics, DNA replication, transcription and translation • Mutations, bacteria, viruses and vaccines, and bioinformatics • How plants and animals work: anatomy, defence, nervous and endocrine systems, reproduction and behaviour

This course at a glance

Lectures: 51 video lectures
Video: 10h 48m in all
Level: Class 9, Class 10, Class 11, Class 12
Language: English
Access: Lifetime access
Certificate: On completion

Lectures last updated September 2026

Course content

1 section · 51 lectures · 10h 48m

1. Biology
- Crash Course Biology Preview4m
- Introduction to Biology: Crash Course Biology #113m
- The Scientific Method: Crash Course Biology #215m
- What Biologists Do: Crash Course Biology #312m
- How Life is Organized: Crash Course Biology #414m
- Intro to Ecology: Why Did All These Elephants Die?: Crash Course Biology #514m
- Community Ecology: Interspecies Interactions: Crash Course Biology #614m
- Population Ecology: How We Saved the Bald Eagle: Crash Course Biology #713m
- What is Climate Change?: Crash Course Biology #813m
- The Effects of Climate Change: Crash Course Biology #912m
Show all 51 lectures
- Conservation Biology: Sixth Mass Extinction?: Crash Course Biology #1013m
- Intro to Evolution: What We Can Learn From a Giraffe's Neck: Crash Course Biology #1113m
- Microevolution: What's An Allele Got to Do With It?: Crash Course Biology #1212m
- Natural Selection: Life's Way of Stayin' Alive: Crash Course Biology #1312m
- Population Genetics: Why do we have different skin colors?: Crash Course Biology #1412m
- Speciation: Where Do Species Come From?: Crash Course Biology #1512m
- Evolutionary History: The Timeline of Life: Crash Course Biology #1613m
- Phylogeny: How We're All Related: Crash Course Biology #1713m
- Biological Diversity, Butts, and the Tree of Life: Crash Course Biology #1813m
- Human Evolution: We Didn't Evolve From Chimps: Crash Course Biology #1912m
- Carbon & Biological Molecules: What is Life Made Of?: Crash Course Biology #2013m
- The Unexpected Truth About Water: Crash Course Biology #2112m
- Microscopes: How We See What We Can't See: Crash Course Biology #2213m
- A Tour of the Cell: Crash Course Biology #2313m
- Cell Membranes: How Does Stuff Get Into Your Cells?: Crash Course Biology #2413m
- Why Do Cells Need to Communicate?: Crash Course Biology #2511m
- Chemical Reactions in Biology: Crash Course Biology #2613m
- Cellular Respiration: Do Cells Breathe?: Crash Course Biology #2714m
- Photosynthesis: The Original Solar Power: Crash Course Biology #2813m
- Mitosis & the Cell Cycle: How Cells Clone Themselves: Crash Course Biology #2911m
- Meiosis: Why Are All Humans Unique?: Crash Course Biology #3012m
- Intro to Genetics: Why Your Cat Looks Like That: Crash Course Biology #3111m
- Genetic Traits: Nature? Nurture? Not That Simple: Crash Course Biology #3212m
- DNA Structure & Replication: Our Instruction Manual for Existing: Crash Course Biology #3312m
- Transcription: How mRNA Helped Save Lives: Crash Course Biology #3412m
- Translation: How RNA Gets Translated into Protein Power: Crash Course Biology #3512m
- How Genes Express Themselves: Crash Course Biology #3611m
- Genetic Mutations: Is Drinking Milk a Super Power?: Crash Course Biology #3713m
- Bacterial DNA & Genetics: Crash Course Biology #3810m
- Viruses & Vaccines: How Do Vaccines Work?: Crash Course Biology 3912m
- Bioinformatics: How Data Saves Lives: Crash Course Biology #4011m
- Multicellular Function: Why We Aren’t Just One Big Cell: Crash Course Biology #4112m
- Plant Anatomy & Physiology: Plants Are Hardcore: Crash Course Biology #4213m
- How Animals Turn Resources Into Waste: The Poop Episode: Crash Course Biology #4312m
- Animal Infrastructure: Why You’re More Than Goo: Crash Course Biology #4412m
- Animal Defense Systems: How Skin, Snot, and Cells Keep Us Healthy: Crash Course Biology #4511m
- Nervous & Endocrine Systems: What Really Happens When You Step on a Lego: Crash Course Biology #4610m
- Sexual & Asexual Reproduction: How Animals Do It: Crash Course Biology #4712m
- Gender, Sex, & Sexuality: What’s the Difference?: Crash Course Biology #4813m
- Animal Behavior: Why This Toad Is Bad at Jumping: Crash Course Biology #4911m
- Biology and You: The Dr. Sammy Show: Crash Course Biology #5012m

How long it takes

10h 48m of video in 51 lectures. Pick a pace that suits you:

Steady
about 3 weeks
at 30 minutes a day
Regular
11 days
at 1 hour a day
Fast track
6 days
at 2 hours a day

Video time only: practice takes a little longer. Your place in every lecture is saved, so you can stop any time.

Earn a certificateLearn more

Watch every lecture, then claim a certificate of completion with your name on it.

Its own web page and code, so a school or an employer can check it is real
Save it as a PDF or print it
Included with the course, at no extra cost

Who teaches it

Sikhami InstituteNew Delhi · 297 courses · 693 learners · 472 followersSikhami Institute is Sikhami's own institute for free learning. We pick some of the best free courses on YouTube, from Harvard's CS50, MIT, NPTEL, Khan Academy, Google, Microsoft, the BBC, Crash Course, PW, Magnet Brains, CodeWithHarry and many more, and turn them into proper courses on Sikhami that you can follow lesson by lesson while your progress is saved. Free courses in every category, in English and Hindi: school and competitive exams, programming and AI, languages, music and dance, art, yoga and fitness, cooking, trades, business, marketing, farming and more. All videos belong to their creators and play from their official YouTube channels, and each course credits its creator. Questions or suggestions? Write to help@sikhami.com.

Questions people ask

Is this course free?

Yes. Joining is free, and the lectures unlock as soon as you join. Once you join, it is yours for life.

How long is the course?

51 video lectures, 10h 48m of video in all. At an hour a day, the videos take 11 days. You learn at your own pace; there are no fixed class times.

Do I get a certificate?

Yes. When you have watched every lecture, you can claim a certificate of completion. It has its own page and code, so anyone can check that it is real. About certificates

What language is it taught in?

English.

Can I learn on my phone?

Yes. Watch on the website or in the Sikhami app for Android with the same account. Your place in every lecture is saved, so you can switch between them.

Can I ask the teacher a doubt?

Yes. Ask it in the questions on the course page, or from inside any lecture while you watch. You can also keep your own notes on each lecture.

Who made these videos?

The lectures are the free, public videos of the YouTube playlist "Biology", and they belong to their creator. Sikhami arranges them into a course, so you can learn one lecture at a time and keep track of your progress.

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