Plant Structures & Functions
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What you will learn
- 1Name the main structures of a flowering plant
- 2Describe the function of roots, stem, leaves, flower, and fruit
- 3Explain how leaves use sunlight to make food in photosynthesis
- 4Trace the path of water from the soil up through the plant
Mini Lesson
Every flowering plant is built from a small set of structures, and each one has a specific job. The roots anchor the plant and pull in water; the stem holds it up and moves water and food around; the leaves make food using sunlight; and the flower makes seeds so a new plant can grow. Once you know what each part does, you can predict what would happen if a part were missing or damaged.
The Main Plant Structures
- Roots — anchor the plant in the soil and absorb water and minerals.
- Stem — supports the plant and carries water up and sugar back down.
- Leaves — capture sunlight and make food through photosynthesis.
- Flower — the reproductive part that makes seeds.
- Fruit — grows from the flower and protects the seeds inside it.
- Seed — a tiny package with everything needed to grow a new plant.
How a Plant Makes Its Own Food
Plants are special because they do not need to eat — they make their own food. Inside the leaf cells, tiny green parts called chloroplasts trap sunlight. The plant combines that energy with water from the roots and carbon dioxide from the air to make a sugar called glucose. Oxygen is released as a side product, which is why forests are sometimes called the lungs of the planet.
- Roots pull water and minerals out of the soil.
- The stem carries water up to the leaves through tiny tubes called xylem.
- Leaves combine sunlight, water, and CO2 to make glucose.
- Glucose travels back through the stem to feed the rest of the plant.
- Oxygen leaves the plant through tiny pores in the leaves called stomata.
Why Each Part Matters
- No roots: the plant tips over and cannot pull in water.
- No leaves: no photosynthesis, no food, no growth.
- No flowers: no seeds, so the plant cannot reproduce.
- No fruit: the seeds have nothing to protect them as they ripen.
Words to know
roots
The part of the plant that anchors it and absorbs water and minerals from the soil.
stem
The part that supports the plant and transports water and food.
leaf
The flat green part where photosynthesis happens.
flower
The reproductive part of the plant; produces seeds.
fruit
The part that grows from the flower and protects the seeds.
seed
A small package with everything needed to grow a new plant.
photosynthesis
The process by which leaves use sunlight, water, and CO2 to make glucose and oxygen.
xylem
Tiny tubes inside the stem that carry water upward from the roots to the leaves.
Tip: water travels UP from the roots through xylem tubes, while sugar travels DOWN from the leaves through phloem tubes. Two highways, two directions.
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