Hierarchy of Organisms Activity: 8 Hands-On Stations for Teaching Cells, Tissues, Organs, Organ Systems, and Organisms (TEKS 7.13B)

Chris Kesler · 8 min read

Hand a 7th grader a single building block and ask, "What does this represent in your body?" Most kids stare at it. They know they have cells. They know they have a heart. But the bridge between the two, the idea that a single cell joins with billions of identical cells to make a tissue, and tissues stack up to make an organ, and organs hook together to make a system, that bridge is missing.

You can lecture this all day. Cells, tissues, organs, organ systems, organism. Five vocabulary words on a slide. Kids copy them down, memorize them for the test, and forget them by Friday. The reason it doesn't stick is because the hierarchy is invisible. Nobody can see a cell turning into a tissue. So kids treat the whole thing as five separate words instead of one continuous zoom-out.

The Hierarchy of Organisms Station Lab for TEKS 7.13B closes that gap in one to two class periods. Kids physically build the hierarchy with snap-together blocks, starting with one block as a single cell and ending with a full organ system on the table. They study labeled diagrams of the human nervous system and respiratory system, classify plant organs (roots, stems, leaves, flowers, fruits, seeds), and trace photosynthesis from cell to leaf to shoot system. By the end, they can take any body part you name, point to where it sits in the hierarchy, and tell you what's above and below it.

⏱ 1–2 class periods 📓 7th Grade Science 🧪 TEKS 7.13B 🎯 Built-in differentiation 💻 Print or Digital

8 hands-on stations for teaching the hierarchy of organisms

A station lab is a student-led activity where small groups rotate through 8 stations (plus a 9th challenge station for early finishers) at their own pace during one to two class periods. You become a facilitator instead of a lecturer. You walk around, spot-check the block models, and break misconceptions while kids work through the rotation.

The Hierarchy of Organisms Station Lab has four input stations (where students take in new info on cells, tissues, organs, organ systems, and organisms in both animals and plants) and four output stations (where they show what they learned). Here's what's at each one.

📷 Image slot 1 — add screenshot

📷 Image slot 2 — add screenshot

4 input stations: how students learn the hierarchy of organisms

🎬 Watch It! —

A short YouTube video walks students through the levels of organization in a living thing. Three questions follow: what specialized cells are, how organs are different from tissues, and to name three organs that make up the digestive system. Visual kids come alive at this station before they ever pick up a building block.

📖 Read It! —

A one-page passage called "From the Smallest Cell to the Complete You" walks students through the four main animal tissue types (connective, muscle, nerve, epithelial), the three plant tissue types (dermal, vascular, ground), the five main animal organs (brain, heart, lungs, intestines, stomach), and the four plant organs (roots, stems, leaves, flowers). Three multiple-choice questions follow plus five vocabulary words to define. Comes in two reading levels (Dependent and Modified) plus a Spanish version.

🔬 Explore It! —

This is the heart of the lab. Each student grabs one snap-together building block to represent a single cell. Step B: connect same-color blocks to form a tissue. Step C: add two or three different-colored blocks to that tissue to build an organ. Step D: the whole group combines their organs to form an organ system. They reference labeled diagrams of the human nervous system (brain, spinal cord, sensory and motor nerves) and respiratory system (nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, lungs, diaphragm) and pick one to model. Three reflection questions wrap it up. The kids finish with a literal hierarchy on the table they built with their hands.

💻 Research It! —

Students examine 10 reference cards focused on plant hierarchy: the two organ systems of a plant (shoot system above ground, root system below), the six main plant organs (roots, stems, leaves, flowers, fruits, seeds), the three plant tissue types (dermal, ground, vascular) with a labeled leaf diagram showing cuticle, epidermis, palisade and spongy mesophyll, xylem, phloem, and stoma, and the unique plant cell structures (cell wall, chloroplasts, vacuole). Five questions follow, including the killer one: identify the organ system, organ, tissue, and part of the cell where photosynthesis takes place.

📷 Featured station deep-dive — add screenshot of the Explore It! task card

4 output stations: how students show what they learned

📋 Organize It! —

A three-column card sort. Kids match each level (cells, tissues, organs, organ system, organism) with its description and an image (red blood cells, muscle tissue, brain, lungs, dolphin). "Group of cells that work together to perform the same function" → tissues. "Self-contained living thing" → organism. Easy to spot-check at a glance.

🎨 Illustrate It! —

Students sketch the full plant hierarchy on the page. They draw a plant cell with nucleus, cell wall, and a large vacuole. Then a tissue formed by multiple plant cells. Then an organ (leaf, stem, or root). Then connect organs to form an organ system (root or shoot). Then label a complete plant including both stem and root system. Even kids who say "I can't draw" surprise themselves here. The drawing locks in the zoom-out structure that's hard to see in a textbook.

✍️ Write It! —

Three open-ended questions: why one type of cell can't do all the jobs in your body, how the levels of hierarchy in a plant are like those in a human, and how understanding the hierarchical organization of cells, tissues, organs, and systems can be useful in other real-world scenarios. The third question is the killer. It forces kids to take what they learned and apply it outside biology.

📝 Assess It! —

Three multiple-choice questions plus a fill-in-the-paragraph that uses all five Read It! vocabulary words (cells, tissues, organ, organ system, organism). The paragraph is about photosynthesis: "In the photosynthetic ___, plants take in sunlight, water, and CO2 through their leaves. Leaves are an ___ of the plant. The leaves contain single ___ with chlorophyll..." If you're grading the lab, this is the easiest station to grade.

Bonus Challenge It! station for early finishers

🏆 Challenge It! —

Four optional extensions: build a foldable with at least three tabs describing the levels of hierarchy and including all Read It! vocabulary, create an infographic explaining the levels with colorful pictures, research one organ system in a plant or animal in eight or more sentences, or design a five-panel comic strip telling the story of a cell becoming a tissue, organ, organ system, and organism. Requires teacher approval before they start.

How this fits into a complete hierarchy of organisms unit

This Station Lab is the Explore day of our full Hierarchy of Organisms Complete 5E Lesson for TEKS 7.13B. The complete two-week unit follows the 5E method of instruction and includes an Engage hook, the Hierarchy of Organisms Station Lab for Explore, PowerPoint slides and interactive notebook pages for Explain, student choice projects to Elaborate, and an Evaluate assessment.

Most teachers grab the full 5E because the Station Lab lands hardest with the days around it. But if you just need a strong hands-on day on the levels of organization, the Station Lab on its own does the job.

Two options

Full 5E Lesson $13.20 Get the 5E Lesson

Hierarchy of Organisms Station Lab cover

Just the Station Lab $7.20 Get the Station Lab

Materials needed to teach the hierarchy of organisms

Materials beyond what's in the download:

Snap-together building blocks in 4–6 colors. About 60 blocks per group rotation. LEGOs, Duplos, or unit cubes all work. Each color stands for one cell type.
Index cards for the Challenge It! foldable extension.
Colored pencils or markers for the Illustrate It! station.
Pencils and the printed answer sheets (included)
A device with internet for the Watch It! station

Standard covered: Texas TEKS 7.13B —

Identify the parts of cells found in living systems, including the cell membrane, cell wall, nucleus, cytoplasm, mitochondria, chloroplast, and vacuole, and describe the levels of organization within an organism, including cells, tissues, organs, organ systems, and organism. Supporting Standard.

See the full standard breakdown →

Grade level: 7th grade life science

Time: One to two class periods (45–110 minutes total). Plan for two periods the first time you run a station lab.

Common student misconceptions this lab fixes

"All cells in a body do the same job."
Kids picture cells as identical little circles with a nucleus in the middle, like a clipart sticker repeated billions of times. The Read It! passage names the four main human tissue types (connective, muscle, nerve, epithelial) and explains that cells with the same function work together to form a tissue. The Explore It! station hits this directly when each kid grabs a single block representing one cell, and then the group has to combine same-colored blocks (same job) to build a tissue. The Write It! question "Why can't one type of cell do all the jobs in your body?" forces them to put it in their own words. By the time they're done, the idea that a muscle cell does something completely different from a nerve cell is locked in.
"Plants don't really have organs and organ systems the way animals do."
Kids treat plants as one big green thing. The Research It! cards split the plant into the same hierarchy as animals: cells, tissues (dermal, ground, vascular), organs (roots, stems, leaves, flowers, fruits, seeds), and organ systems (just two: shoot system and root system). The labeled leaf diagram showing palisade mesophyll, xylem, and phloem makes the plant tissue layer concrete. The Illustrate It! station forces them to draw the full plant hierarchy from cell up to the whole plant, side by side with how a human body is organized. Once they see a leaf as an organ and the shoot system as an organ system, plants stop being decoration on the diagram.
"Organs and organ systems are basically the same thing."
Kids hear "the heart" and "the circulatory system" and treat them as synonyms. The Explore It! block-building activity catches this. They build an organ first (Step C: a tissue plus two or three different-colored tissues snapped together) and then have to combine that organ with everyone else's organs to form an organ system (Step D). They physically see that an organ system is a group of organs working together, not just a fancy name for one organ. The Assess It! question "The heart is an organ that pumps blood throughout the body. Which organ system does the heart belong to?" closes the loop by asking them to place a specific organ inside the right system.

What you get with this hierarchy of organisms activity

📷 Inside-the-product — add screenshot of Read It passage or sample answer sheet

When you buy the Station Lab, you get a single download with everything you need:

Print version at two reading levels (Dependent for on-grade, Modified for additional support) plus a Spanish Read It! passage
Digital version as PowerPoint files (works in Google Slides too) at both levels, for 1:1 classrooms or Google Classroom
Teacher Directions and Answer Key for both versions, all keys included
Station task cards ready to print, laminate, and drop in baskets at each station
Reference cards for the Research It! station (plant organ systems, plant organs table, plant tissues with labeled leaf diagram, plant cell structures)
Sort cards for the Organize It! station (15 cards matching each level to its description and a sample image)
Animal/plant diagrams and the human nervous and respiratory system reference for the Explore It! activity
Student answer sheets for each level

No login required. Download once, use forever. Reprint as many times as you want.

Tips for teaching the hierarchy of organisms in your 7th grade classroom

Two things make this lab go smoother the first time:

1. Pre-sort blocks into 4–6 cups by color before class.

If kids have to dig through a mixed bin to find same-colored blocks, you lose 5 minutes per group at the Explore It! station. Pre-sort about 10 blocks of each color into cups. Tape a sticky note on each cup naming the cell type it represents ("BLUE = NERVE CELLS"). Drop them in a basket at the station and the building goes fast.

2. Walk students through the zoom-out before they start.

Before kids go to Explore It!, hold up one block and say "This is a cell." Then click in three more of the same color. "Now you have a tissue." Add two different colors. "Now you have an organ." Combine with another organ. "Now you have an organ system." Sixty seconds. They'll get to the station with the picture already in their head, and the rest of the rotation reinforces it instead of introducing it cold.

Get this hierarchy of organisms activity

Hierarchy of Organisms Station Lab for 7th grade life science (TEKS 7.13B)

Buy the Station Lab ($7.20)

Or if you want the full two-week experience with the Engage hook, Explain day, Elaborate extension, and Evaluate assessment all included:

Buy the full 5E Complete Lesson ($13.20)

(Station Lab is included)

Frequently asked questions

What does TEKS 7.13B cover?

Texas TEKS 7.13B asks 7th grade students to describe the levels of organization within an organism, including cells, tissues, organs, organ systems, and organism, and to identify the parts of cells found in living systems (cell membrane, cell wall, nucleus, cytoplasm, mitochondria, chloroplast, vacuole). By the end, students should be able to take any body part and place it correctly in the hierarchy from least complex to most complex.

What's the difference between a tissue and an organ?

A tissue is a group of cells that all do the same function (muscle tissue is all muscle cells; nerve tissue is all nerve cells). An organ is two or more different tissues working together to perform a job (the heart is muscle tissue, nerve tissue, connective tissue, and epithelial tissue all combined). The block-building activity in Explore It! makes this concrete: same-colored blocks = tissue, different-colored blocks combined = organ.

How long does this hierarchy of organisms activity take?

One to two class periods (45 to 110 minutes total). The Explore It! block-building station is the longest part, so plan for two periods the first time you run a station lab. Once your class has the routine down, most groups can finish all 8 stations in one period.

Do I need to provide my own materials?

Snap-together building blocks in 4–6 colors (LEGOs, Duplos, or unit cubes all work), index cards, and colored pencils. Total cost for a class of 30: under $20 if you don't already have these supplies, and most schools have a bin of LEGOs somewhere already. The Watch It! station also needs a device with internet.

Can I use this in a 1:1 digital classroom?

Yes. The full digital version (PowerPoint or Google Slides) works in 1:1 classrooms and Google Classroom. The block-building activity can be replaced by drag-and-drop cell, tissue, and organ tiles in the digital version, or you can keep the Explore It! station as the one physical center kids rotate through.