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Tamil Nadu (TNBSE)Class 3 Science★ 5-6 marks in TN Class 3 Term 2 exams — labelling plant parts, root types, flower parts, and functions of each part

Plants

Samacheer Kalvi (TN State Board) Class 3 Science — Chapter 7, Plants. Parts of plants and seed germination. Study notes, key concepts, worked examples, practice questions and quick revision for exam preparation.

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By the end of this chapter you'll be able to…

1Name the 6 basic parts of a plant: root, stem, leaf, flower, fruit, seed
2State the function of each part: root (anchors, absorbs water), stem (supports, transports), leaf (makes food/photosynthesis), flower (reproduction, becomes fruit), fruit (protects seeds), seed (grows into new plant)
3Identify the two types of roots: tap root (one main root, e.g., carrot, mango) and fibrous root (many thin roots, e.g., grass, rice, onion)
4Name the 4 parts of a flower: petal, sepal, stamen, pistil
5State two functions of leaves: make food (photosynthesis) and release water vapour (transpiration)

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Why this chapter matters

Plants are the foundation of life on Earth — they produce the oxygen we breathe and the food we eat. Class 3 goes deeper than just naming parts: children learn the two types of roots (tap root and fibrous root), the detailed parts of a flower (petals, sepals, stamen, pistil), and the specific function of each plant part. The leaf is introduced as a food factory (photosynthesis in simple terms). Understanding plants scientifically is the first step towards agriculture, botany, and environmental science.

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Plants — Class 3 Science (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 3 Science, Chapter 7. Parts of plants and seed germination.

1. About this chapter

This chapter covers Plants as part of the Class 3 Samacheer Kalvi Science curriculum. It deals with parts of plants and seed germination and builds conceptual understanding essential for the TN School Term Exam.

By the end of this chapter, students will be able to:

Label the parts of a plant
Describe the stages of seed germination

2. Key concepts

Concept 1: Label the parts of a plant.
Concept 2: Describe the stages of seed germination.

3. Important terms and formulas

Term / Formula	Description
Label the parts of…	Label the parts of a plant
Describe the stages of…	Describe the stages of seed germination

4. Worked examples

Example 1. Applying a key concept from this chapter.

Solution: Identify the relevant principle → apply the formula or rule → state the answer with correct units.

Example 2. A typical exam-style question on plants.

Solution: Break the problem into steps, use the appropriate formula and verify the answer.

5. Common mistakes

Mistake: Skipping units or forgetting to state them. Fix: Always write units alongside every quantity and answer.
Mistake: Confusing similar terms or concepts in this chapter. Fix: Make a comparison table of the terms during revision.

6. Practice (exam-style)

Define the main term or principle covered in Chapter 7.
Give two real-life examples related to plants.
Solve a short numerical or descriptive question from this chapter.
State one important formula and explain each symbol.

7. Answer key (hints)

Refer to section 2 (Key concepts) above for the definition.
Examples should be drawn from daily experience and local context.
Apply the formula from section 3, show all steps clearly.
Formula with units — refer to the textbook glossary for symbol meanings.

8. Quick revision

Class 3 Science — Chapter 7: Plants.
Core idea: Parts of plants and seed germination.
Key outcomes: Label the parts of a plant; Describe the stages of seed germination.
Always revise diagrams / tables from the Samacheer Kalvi textbook before the exam.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

Parts of a plant and their functions

Root → underground, anchors the plant firmly in soil, absorbs water and minerals. Stem → above ground, holds branches/leaves/flowers, transports water from roots to leaves and food from leaves to all parts. Leaf → green, contains chlorophyll, makes food using sunlight, CO₂, and water (photosynthesis). Flower → reproductive part, colourful to attract insects, produces fruit. Fruit → contains and protects seeds. Seed → contains a baby plant (embryo), grows into a new plant under right conditions.

Not all plants have all six parts at once. A young seedling has only root, stem, and leaves. Flowers and fruits develop as the plant matures.

Types of roots

Tap root → one thick main root that grows straight down, with smaller side roots branching off. Examples: carrot, radish, mango tree, neem tree, beetroot. Fibrous root → many thin, hair-like roots spreading in all directions from the base of the stem, no single main root. Examples: grass, rice, wheat, onion, maize.

Plants with tap roots are generally dicots; plants with fibrous roots are generally monocots. Tap roots reach deep water; fibrous roots prevent soil erosion by holding surface soil tightly.

Parts of a flower

Petal → colourful part that attracts insects and birds for pollination. Sepal → small green leaf-like structures below the petals, protect the flower bud. Stamen → male part, produces pollen (a powdery substance). Pistil → female part, in the centre of the flower, receives pollen and develops into fruit.

A complete flower has all four parts: petals, sepals, stamen, and pistil. Some flowers may lack one or more parts — they are called incomplete flowers.

Functions of leaves

Photosynthesis → leaves use sunlight, carbon dioxide (from air), and water (from roots) to make food (glucose/sugar) and release oxygen. Transpiration → leaves release excess water as water vapour through tiny pores (stomata). This helps pull water up from roots.

Photosynthesis literally means 'making things using light' (photo = light, synthesis = making). The green colour comes from chlorophyll, the substance that captures sunlight.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Calling a carrot a 'root' but not knowing it is specifically a tap root

✓ A carrot is a tap root — one thick main root. When you eat a carrot, you are eating a modified tap root that stores food for the plant. The green leaves you see above ground were grown using the food stored in the root.

WATCH OUT

✗ Thinking the stem's only job is to hold the plant up

✓ The stem is also a transport highway. It has tube-like vessels — xylem carries water UP from roots, phloem carries food DOWN from leaves. Some stems also store food (potato, ginger, sugarcane).

WATCH OUT

✗ Confusing the stamen and pistil

✓ Stamen = male part (think 'MEN' in stamen), produces pollen. Pistil = female part, in the centre, sticky tip to catch pollen. A flower that has BOTH stamen and pistil is called a bisexual or perfect flower (e.g., hibiscus, tomato).

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