Cells are the building blocks of all living things. They...
Biology78 views·Updated Jun 5, 2026·3 pagesUnderstanding Organelles for 7th Grade
Sara B ✝️@sara_thdx
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Cell Organelles
The cell has many important parts that work together. The nucleus acts as the cell's brain, while the cell membrane forms a protective barrier around it. Inside cells, you'll find the cytoplasm, a jelly-like fluid where other structures float.
Plant cells have special parts like the chloroplast for making food from sunlight and a rigid cell wall for support. Both plant and animal cells contain mitochondria (the powerhouse of the cell) and the endoplasmic reticulum (ER) for transporting materials.
Other important organelles include the Golgi Complex that packages materials, ribosomes that make proteins, and vacuoles that store water and nutrients. Inside the nucleus, you'll find chromosomes containing genetic information.
Fun Fact: Your body contains about 30 trillion cells, each with most of these organelles working non-stop to keep you alive!
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of 3
Cell Organelle Functions
The cell membrane works like a security guard, being selectively permeable - letting helpful things in while keeping harmful things out. The nucleus is like the cell's brain, controlling all activities that happen inside. The cytoplasm is the jelly-like substance that gives the cell its shape and holds all the organelles in place.
Plant cells contain chloroplasts that trap sunlight and convert it to food energy through photosynthesis. The mitochondria function as the powerhouse of the cell, creating energy the cell needs to function.
Chromosomes found in the nucleus contain all the genetic information that makes you unique. These thread-like structures carry instructions for everything from your eye color to how tall you'll grow.
Remember: Even though you can't see them without a microscope, these tiny organelles work together perfectly to keep cells (and you) alive!
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of 3
More Cell Organelles and Functions
Vacuoles are storage sacs that hold water and nutrients for the cell to use when needed. The endoplasmic reticulum (ER) serves as a transportation system, moving proteins and other materials throughout the cell.
The cell wall is found only in plant cells and some other organisms. It's the tough outer layer that gives plants their structure and helps protect them. Ribosomes are tiny factories that make proteins according to instructions from the nucleus.
Lysosomes act as the cell's recycling center, breaking down waste materials and worn-out cell parts. These small sacs contain enzymes that can digest almost anything inside the cell that needs to be removed.
Try this: Think of your cell as a tiny city - the nucleus is city hall, mitochondria are power plants, and lysosomes are recycling centers. How would you describe the other organelles?
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Biology78 views·Updated Jun 5, 2026·3 pagesUnderstanding Organelles for 7th Grade
Sara B ✝️@sara_thdx
Cells are the building blocks of all living things. They contain different parts called organelles, each with a unique job. Understanding these cell parts helps us see how cells work as tiny factories inside our bodies and plants.
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Cell Organelles
The cell has many important parts that work together. The nucleus acts as the cell's brain, while the cell membrane forms a protective barrier around it. Inside cells, you'll find the cytoplasm, a jelly-like fluid where other structures float.
Plant cells have special parts like the chloroplast for making food from sunlight and a rigid cell wall for support. Both plant and animal cells contain mitochondria (the powerhouse of the cell) and the endoplasmic reticulum (ER) for transporting materials.
Other important organelles include the Golgi Complex that packages materials, ribosomes that make proteins, and vacuoles that store water and nutrients. Inside the nucleus, you'll find chromosomes containing genetic information.
Fun Fact: Your body contains about 30 trillion cells, each with most of these organelles working non-stop to keep you alive!
2
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Cell Organelle Functions
The cell membrane works like a security guard, being selectively permeable - letting helpful things in while keeping harmful things out. The nucleus is like the cell's brain, controlling all activities that happen inside. The cytoplasm is the jelly-like substance that gives the cell its shape and holds all the organelles in place.
Plant cells contain chloroplasts that trap sunlight and convert it to food energy through photosynthesis. The mitochondria function as the powerhouse of the cell, creating energy the cell needs to function.
Chromosomes found in the nucleus contain all the genetic information that makes you unique. These thread-like structures carry instructions for everything from your eye color to how tall you'll grow.
Remember: Even though you can't see them without a microscope, these tiny organelles work together perfectly to keep cells (and you) alive!
3
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
More Cell Organelles and Functions
Vacuoles are storage sacs that hold water and nutrients for the cell to use when needed. The endoplasmic reticulum (ER) serves as a transportation system, moving proteins and other materials throughout the cell.
The cell wall is found only in plant cells and some other organisms. It's the tough outer layer that gives plants their structure and helps protect them. Ribosomes are tiny factories that make proteins according to instructions from the nucleus.
Lysosomes act as the cell's recycling center, breaking down waste materials and worn-out cell parts. These small sacs contain enzymes that can digest almost anything inside the cell that needs to be removed.
Try this: Think of your cell as a tiny city - the nucleus is city hall, mitochondria are power plants, and lysosomes are recycling centers. How would you describe the other organelles?
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5App Store
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Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
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