Plants and Their Parts
1. The Six Main Parts of a Plant
A plant has SIX main parts. Each part has a SPECIFIC job.
| Part | What It Does |
|---|---|
| Root | Anchors the plant. Absorbs water and minerals from the soil. |
| Stem | Carries water and food between roots and leaves. Supports the plant. |
| Leaf | Makes FOOD for the plant through PHOTOSYNTHESIS. |
| Flower | Helps in REPRODUCTION — makes seeds. |
| Fruit | Protects the seeds. Helps in seed DISPERSAL. |
| Seed | Grows into a NEW plant. |
'A plant is like a factory. Each part has a DIFFERENT job, and they all work together to keep the plant alive.'
2. Roots
Types of Roots:
Taproot:
- ONE main root that grows STRAIGHT down.
- Small SIDE roots (lateral roots) grow from it.
- 'Found in CARROTS, RADISHES, TURNIPS, and MANGO trees.'
Fibrous Root:
- MANY thin roots of similar size.
- Spread out like a MOP or a NET.
- 'Found in WHEAT, RICE, GRASS, and COCONUT trees.'
| Taproot | Fibrous Root |
|---|---|
| One main thick root | Many thin roots |
| Goes deep into the soil | Spreads near the surface |
| Carrot, Beetroot, Mango | Grass, Wheat, Rice |
| Can store food | Absorbs water quickly |
Functions of Roots:
- Anchor the plant firmly in the soil.
- Absorb water and minerals from the soil.
- Store food (in some plants — carrot, radish, sweet potato).
- Hold the soil together (prevents soil erosion).
3. Stem
Functions of the Stem:
- Carries water and minerals from roots to leaves.
- Carries food from leaves to other parts.
- Supports leaves, flowers, and fruits.
- Stores food in some plants (potato, sugarcane, ginger).
Types of Stems:
- Herbaceous stem: Soft, green, flexible (grass, mint).
- Woody stem: Hard, thick, brown (mango tree, neem tree).
- Underground stem: Grows under the soil (potato, ginger, onion).
'Did you know? A potato is actually a STEM, not a root! It grows underground but has buds (eyes) that can grow into new plants.'
4. Leaf
Parts of a Leaf:
| Part | Description |
|---|---|
| Lamina (Blade) | The flat, green part of the leaf |
| Petiole | The stalk that joins the leaf to the stem |
| Midrib | The central vein of the leaf |
| Veins | Lines that carry water and food |
Venation (Arrangement of Veins):
Reticulate Venation: Veins form a NET-like pattern. 'Found in mango, neem, hibiscus, and most BROAD-LEAF plants.'
Parallel Venation: Veins run PARALLEL to each other. 'Found in grass, wheat, rice, sugarcane, and most NARROW-LEAF plants.'
| Reticulate Venation | Parallel Venation |
|---|---|
| Net-like pattern | Lines run side by side |
| Mango, Peepal, Rose | Grass, Wheat, Corn |
| Usually in dicot plants | Usually in monocot plants |
5. Flower
Parts of a Flower:
- Petals: Colourful parts that attract insects and birds for pollination.
- Sepals: Small green leaves that protect the flower bud.
- Stamen: The male part that makes POLLEN.
- Pistil: The female part that makes OVULES (which become seeds).
Functions of Flowers:
- Flowers produce SEEDS.
- Seeds grow into NEW plants.
- 'Without flowers, many fruit plants would not exist.'
6. Fruit and Seed
Fruit:
- The FRUIT develops from the flower AFTER pollination.
- It PROTECTS the seeds inside.
- It helps in seed DISPERSAL (spreading seeds).
Seed:
- A seed contains a BABY PLANT (embryo) inside.
- It has a FOOD STORE for the baby plant.
- When a seed gets the right conditions (water, air, warmth), it GERMINATES — grows into a new plant.
Seed Dispersal:
| Method | How It Works | Example |
|---|---|---|
| Wind | Light seeds with wings or hair | Mango, Maple |
| Water | Seeds float on water | Coconut |
| Animals | Seeds stick to fur or are eaten | Cocklebur, Guava |
| Explosion | Pod bursts open | Balsam, Pea |
7. Photosynthesis — How Plants Make Food
PHOTOSYNTHESIS is the process by which plants make their OWN food.
What Plants Need:
- Sunlight — from the Sun
- Water — absorbed by roots from the soil
- Carbon dioxide — from the air (through tiny holes in leaves called STOMATA)
- Chlorophyll — the GREEN pigment in leaves
What Plants Make:
Food (glucose) + Oxygen
Word Equation:
'Carbon Dioxide + Water → (in the presence of Sunlight and Chlorophyll) → Glucose + Oxygen'
Why Photosynthesis Is Important:
- Plants make food for THEMSELVES and for ALL animals (including humans).
- Plants release OXYGEN, which we breathe.
'Did you know? The tiny holes (stomata) on leaves open during the day and close at night. That is when photosynthesis happens — during DAYLIGHT.'
8. Common Mistakes
- Calling a potato a root: 'A potato is a STEM, not a root. It has buds (eyes) that grow into new plants. Roots do NOT have buds.'
- Confusing taproot and fibrous root: 'Carrot has ONE thick root going down (taproot). Grass has MANY thin roots (fibrous).'
- Thinking plants eat soil: 'Plants DO NOT eat soil. They absorb water and minerals from soil and make their OWN food through photosynthesis.'
- Confusing pollination and photosynthesis: 'Pollination is about making SEEDS. Photosynthesis is about making FOOD. They are DIFFERENT processes!'
9. Key Facts to Remember
- 'Plants have SIX parts: root, stem, leaf, flower, fruit, seed.'
- 'Roots absorb WATER and MINERALS from the soil.'
- 'Leaves are the FOOD FACTORIES of the plant.'
- 'Photosynthesis needs SUNLIGHT, WATER, CARBON DIOXIDE, and CHLOROPHYLL.'
- 'Fruits develop from FLOWERS. Seeds grow into NEW PLANTS.'
10. Self-Test
Q1: Name the six main parts of a flowering plant.
Q2: What is the difference between taproot and fibrous root? Give one example of each.
Q3: Why are leaves called the 'food factories' of the plant?
Q4: List the four things a plant needs for photosynthesis.
Q5: What is released by plants during photosynthesis that animals need to breathe?
Q6: How does a coconut seed travel from one place to another?
Q7: Is a potato a root or a stem? How can you tell?
Q8: Match the venation to the plant: (a) Reticulate — Mango/Grass (b) Parallel — Neem/Wheat
Answers:
A1: Root, stem, leaf, flower, fruit, seed. A2: Taproot has ONE main root (carrot). Fibrous root has MANY thin roots (grass). A3: Because they make food (glucose) through photosynthesis using sunlight, water, and carbon dioxide. A4: Sunlight, water, carbon dioxide, and chlorophyll. A5: Oxygen. A6: By WATER — coconuts float and can travel across oceans. A7: A potato is a STEM. It has buds (eyes) that can grow into new plants. Roots do not have buds. A8: (a) Reticulate → Mango (b) Parallel → Wheat
