Life Science — Plants & Seeds · Unit 2, Lesson 1 of 6
📚 Grade: Kindergarten⏱️ Duration: 30–45 minutes🌿 Subject: Life Science — Plants & Seeds🧰 Kit Lesson: No
🫘 🔍 🌿
A tiny seed holds a big secret — a baby plant, packed and ready to grow.
📋 NGSS Standard: K-LS1-1 — Use observations to describe patterns of what plants and animals (including humans) need to survive.
🎯 Learning Objective
Students will investigate what's Inside a Seed?, make observations during the lesson activity, and explain what they learned using evidence from the lesson.
🎯 The Big Idea
A seed is not just a little brown lump! Inside every seed there is a baby plant waiting to wake up. The seed also carries its own food supply — everything it needs to start growing before it can make food from the sun. Today we're going to crack one open and look inside.
🔬 The Science
Every seed has three main parts:
Seed coat — the tough outer covering that protects everything inside, like a little sleeping bag.
Embryo — the tiny baby plant curled up inside, waiting for the right conditions to sprout.
Cotyledon (food storage) — the built-in food supply that feeds the baby plant while it's too small to make its own food from sunlight.
When a seed gets water, warmth, and the right conditions, the embryo wakes up and starts to grow — using the stored food as fuel. This is called germination.
Dried lima beans (a small handful — you'll want extras)
Cup of water (for overnight soaking)
Paper towels
Magnifying glass
Pencil and paper (or the worksheet on the last page)
⏰ Prep Required
Soak the lima beans in water the night before (or at least 4–6 hours ahead). They'll puff up and become soft — much easier for little fingers to split open!
🌿 Let's Get Started
Step 1 — The Before Observation (5 min)
Put one dry lima bean and one soaked lima bean on a paper towel side by side. Ask: "What do you notice? How are these two beans different?"
Let the child touch both. The soaked bean should feel softer and look swollen. Discuss: the water got in through tiny openings in the seed coat!
Step 2 — Peel the Seed Coat (5 min)
Take a soaked bean. Gently help your child peel off the thin papery outer layer — this is the seed coat! It should slip off easily.
Say: "This is the seed's protective covering — like a jacket. What do you think is inside?"
Step 3 — Split It Open! (5 min)
Hold the bean with a thumbnail at the natural seam and gently press. It should split into two halves. (Do this with your child — it's very satisfying!) "Look very carefully. Can you see something tiny inside?"
Have the child use the magnifying glass to look at the inner curve of one half. That tiny curved shape is the embryo — the baby plant!
Step 4 — Find All Three Parts (5–10 min)
With the magnifying glass, help the child identify:
The seed coat (the peeled-off skin)
The embryo (the tiny curved baby plant inside — look for a small nub or sprout shape)
The cotyledon (the two big fleshy halves — this is the food storage!)
Point out: the two big halves are what feeds the baby plant when it first starts to grow. It's like a packed lunch!
Step 5 — Draw What You See (10 min)
While the bean halves are still on the paper towel, have the child draw:
1. The outside of the seed (before splitting)
2. The inside of the seed (split open, both halves visible)
Use the worksheet on the last page to label and circle the baby plant part.
Step 6 — Compare & Wonder (5 min)
Put the dry bean back next to the open soaked bean. Ask: "This same tiny baby plant was in the dry bean all along. What do you think it was waiting for?"
(Answer: water! And warmth, and a good place to grow.) Let the child's ideas lead the conversation.
💬 Discussion Questions
🗣️ Talk about these together:
What are the three parts of the seed we found today?
The seed coat (the outside skin), the baby plant (embryo), and the food storage (cotyledon).
Why do you think the seed has food stored inside it?
The baby plant needs food to start growing before it can make its own food from the sun. It's like a packed lunch for the journey!
How was the soaked bean different from the dry bean?
The soaked bean was softer, bigger, and easier to open because water got inside and woke it up a little.
If you were a seed, what would you need to start growing?
Water, warmth, and soil — let the child brainstorm freely!
🚀 Extensions
🍎 Seed Safari: Collect and compare different kinds of seeds — apple seeds, sunflower seeds, an avocado pit, a peach pit. Which ones can you split open? What do they have in common?
💧 Germination Watch: Place a soaked lima bean in a zip-lock bag with a damp paper towel and tape it to a sunny window. Check it daily — how many days until you see the first root or sprout?
🌻 Seed Size Compare: Line up seeds from smallest to largest. A sesame seed vs. a lima bean vs. an avocado pit — do bigger seeds always grow bigger plants?
📚 Read Aloud:"The Tiny Seed" by Eric Carle or "From Seed to Plant" by Gail Gibbons
👩🏫 Parent/Teacher Notes
Prep tip: Soak the beans the night before (or first thing in the morning if doing this in the afternoon). Dry beans are too hard for small fingers to split cleanly — the soaked ones make a much more satisfying and clear observation.
The embryo is tiny! A magnifying glass is essential here. Look for a small curved nub on the inner edge of one of the cotyledon halves — it may look like a tiny comma or sprout shape. If you can't see it clearly, try a few beans — some show it more clearly than others.
Extension idea: Compare different seed types side by side — apple seeds, sunflower seeds, a bean, and an avocado pit all have the same basic three-part structure, just at very different scales. This is a great conversation starter about how all seeds are related.
Vocabulary to introduce:seed coat, embryo, cotyledon. You don't need to drill these — just use them naturally as you explore. They'll hear them again in later lessons.
This is Lesson 1 of 6: Don't plant the bean yet — that's coming in Lesson 2! For now, keep the focus on observation. We're building the question: "What does a seed need to grow?" before we try to answer it.
Science talk tip: When the child says something like "it has a baby inside!" — that's exactly right. Affirm it and layer in the vocabulary: "Yes! Scientists call that tiny baby plant the embryo."
Draw what you see! Look closely with your magnifying glass. 🔍
🫘 The Outside of the Seed
✂️ The Inside (Split Open)
🏷️ Label the Parts
Draw a line from each word to the part of your seed drawing, or write the name next to the correct part.
🧥 seed coat
🌿 baby plant
🍱 food storage
⭕ Circle It!
In your drawing of the inside, circle the part that will become a new plant.
✏️ My Observations
How was the soaked bean different from the dry bean?
What surprised you about the inside of the seed?
🌱 ANSWER KEY — Parent/Teacher Copy
🏷️ Labeling the Seed Parts
Seed coat — The thin papery outer skin that wraps the seed. It peels off easily after soaking. Its job is to protect the embryo and food supply inside.
Baby plant (embryo) — The tiny curved shape tucked inside one of the bean halves. It looks like a little sprout or comma shape. This is the part that will grow into a new plant.
Food storage (cotyledon) — The two large, fleshy halves of the bean. These store the nutrients the embryo uses to start growing before it can make its own food from sunlight.
⭕ Circle the Part That Will Become a New Plant
The child should circle the embryo (the baby plant) — the small curved structure visible on the inner edge of one of the cotyledon halves.
✏️ Sample Observation Answers
How was the soaked bean different from the dry bean?
The soaked bean was bigger and softer than the dry bean.
The soaked bean was easier to open and peel.
The soaked bean looked swollen because it absorbed water.
What surprised you about the inside of the seed?
There was a tiny baby plant hiding inside!
The big parts are actually food for the baby plant.
It has a protective coat, just like an egg has a shell.
💬 Discussion Answer
"Why do you think the seed has food stored inside it?"
The baby plant needs food to start growing before it can make its own food from the sun. It's like a packed lunch for the journey! The stored food in the cotyledon feeds the embryo until the seedling grows leaves and can begin photosynthesis.
✅ What Success Looks Like
Child can name the three parts of a seed: seed coat, baby plant (embryo), food storage (cotyledon).
Child correctly identifies the embryo as the part that will become a new plant.
Child can describe at least one way the soaked bean looked or felt different from the dry bean.
Child can explain (in their own words) why the seed stores food inside.
💡 Coming up in Lesson 2: We'll plant those beans! Now that kids know what's inside a seed, they're ready to ask: what does a seed need to grow?
