How Plants Grow
Kindergarten · Science · Study Guide
Find out what plants need to grow and how a tiny seed becomes a tall tree or beautiful flower!
Plants are amazing living things that can make their own food using sunlight! Every plant starts its life as a seed. Inside a seed is a tiny plant waiting to sprout. When a seed gets soil, water, and warmth, it germinates — which means it starts to grow. A small root pushes down into the soil, and a tiny shoot pushes up toward the light.
Plants need four main things to grow: sunlight, water, soil, and air. Roots soak up water and nutrients from the soil and hold the plant in place. Stems carry water and food throughout the plant. Leaves collect sunlight and use it along with air and water to make food — this process is called photosynthesis. Flowers help the plant make new seeds so the cycle starts all over again!
Plants grow at different speeds. Some tiny plants sprout in just a few days. Trees can take years to grow tall. But all plants follow the same basic life cycle: seed, sprout, seedling, plant, flower, and new seed.
| Need | Why It Matters |
|---|---|
| Sunlight | Plants use it to make food through photosynthesis |
| Water | Roots absorb it; it carries nutrients through the plant |
| Soil | Anchors the plant; holds water and nutrients for roots |
| Air | Leaves absorb carbon dioxide from air to make food |
Key terms
- Seed
- A tiny object that can grow into a new plant when given the right conditions.
- Germinate
- When a seed starts to sprout and grow into a plant.
- Root
- The part of the plant underground that absorbs water and nutrients and holds the plant in place.
- Photosynthesis
- The process plants use to make their own food using sunlight, water, and air.
- Life cycle
- The stages a living thing goes through from birth to making new offspring.
Flashcards
- Seed
- A tiny case containing a baby plant that can grow into a full plant.
- Germinate
- To sprout and begin growing — what a seed does when conditions are right.
- Root
- The underground part of a plant that absorbs water and anchors the plant.
- Stem
- The part that holds the plant up and carries water from roots to leaves.
- Leaf
- The part of a plant that collects sunlight and makes food.
- Photosynthesis
- The way plants make food using sunlight, water, and air.
Practice questions
What does a seed need to start growing?
- Ice and snow
- Soil, water, and warmth
- Sand and salt
- Wind only
Show answer
Answer: Soil, water, and warmth
Seeds need moisture to activate growth, soil to anchor roots, and warmth to trigger germination.
Roots hold the plant in the soil and absorb water.
Show answer
Answer: True
Roots anchor the plant firmly in soil and absorb water and dissolved nutrients that travel up through the stem.
What is the process called when plants make food using sunlight?
- Hibernation
- Migration
- Photosynthesis
- Evaporation
Show answer
Answer: Photosynthesis
Photosynthesis happens in leaves — they take in sunlight, water from roots, and carbon dioxide from air to produce sugar (food) and oxygen.
All plants start their life as flowers.
Show answer
Answer: False
All plants start as seeds — they grow into seedlings, then plants, and later (if it's a flowering plant) they produce flowers.
When a seed starts to sprout and grow it is called ___.
Show answer
Answer: germination
Germination is the process when a seed absorbs water, breaks open, and begins growing a root and shoot.
Fun facts
- The world's tallest tree is a coastal redwood in California that stands over 380 feet tall — taller than a 35-story building!
- Some seeds can stay dormant (sleeping) in the soil for hundreds of years before sprouting!
- Plants make oxygen as a byproduct of photosynthesis — so every breath of fresh air you take is thanks to plants.
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