Have you ever wondered how your heart keeps beating without you thinking about it, or how a tree trunk can stand up against strong winds without falling? The secret lies in tissues — organised groups of cells that work together as a team to do one specific job, and do it brilliantly!
Think of it like a school. One teacher alone cannot run the whole school. So different teachers specialise — some teach science, some teach maths. Similarly, cells in your body specialise and form teams called tissues. Muscle tissue contracts to make you move. Nerve tissue carries messages. Blood tissue carries oxygen. Each tissue has a special job and is perfectly designed for it.
In this chapter, we explore the different types of plant tissues (like xylem, phloem, and meristematic tissue) and animal tissues (like epithelial, muscle, nervous, and connective tissue). By the end, you will understand why a walnut shell is so hard, why your heart never tires, and how a tall tree transports water from roots all the way to its topmost leaves!
📝 Section 3 — Worked Examples
🔎 Example 1 — Name the Tissue
Question: The cells have very thick walls.
They are dead. They are found in walnut shells.
What tissue is this?
1
Check if cells are alive or dead.
The question says cells are dead.
2
Check the wall thickness.
Walls are very thick.
3
Check where it is found.
It is in hard shells like walnut.
4
Match with tissue types.
Dead + very thick walls + hard shell = Sclerenchyma.
✅ Answer: The tissue is Sclerenchyma.
💡 Tip: Dead + thick + hard = Sclerenchyma. Alive + thick corners = Collenchyma.
🏋️ Example 2 — Classify by Muscle Type
Question: Put each body part
under the right muscle type:
Heart, Arm, Stomach, Thigh, Intestine, Tongue.
1
Striated (voluntary, attached to bones):
Arm, Thigh, Tongue — we can control these.
2
Smooth (involuntary, inside organs):
Stomach, Intestine — they work on their own.
3
Cardiac (involuntary, only in heart):
Heart — it beats on its own, never stops.
✅ Answer:
Striated → Arm, Thigh, Tongue
Smooth → Stomach, Intestine
Cardiac → Heart
💡 Tip: If you can move it by thinking, it is striated.
💧 Example 3 — Xylem vs Phloem
Question: Which tissue carries water?
Which carries food? How are they different?
1
What does Xylem do?
Xylem carries water and minerals UP.
Water goes from roots to leaves.
2
What does Phloem do?
Phloem carries food DOWN.
Food goes from leaves to other parts.
3
Are their cells alive or dead?
Xylem cells are mostly dead.
Phloem cells are mostly alive.
✅ Answer:
Xylem → carries water UP (dead cells)
Phloem → carries food DOWN (alive cells)
💡 Tip: Remember "X-Up" — Xylem takes water Up!
📄 Section 5 — Take-Home Handout
Part A — Fill in the Blanks (5 questions)
- 1. A group of similar cells
doing one job is called a ________.
- 2. ________ tissue divides fast
and helps plants grow taller.
- 3. Xylem carries ________ upward
from roots to leaves.
- 4. The muscle found only in the
heart is called ________ muscle.
- 5. Sclerenchyma cells are ________
(alive / dead).
Part B — True or False (5 questions)
- 1. Phloem carries water in plants. ( )
- 2. Smooth muscle has stripes on it. ( )
- 3. Parenchyma cells have thin walls. ( )
- 4. Neurons carry electrical messages. ( )
- 5. Epithelial cells have big gaps between them. ( )
Part C — Solve These (3 problems)
Problem 1: A plant tissue has cells
that are alive. Their corners are thick.
They bend but do not break.
Name this tissue. Explain why it bends.
Problem 2: Name three types
of connective tissue in the body.
Write one job of each.
Problem 3: What is the difference
between xylem and phloem?
Write at least two points.
Part D — Match the Columns
| Column A |
Column B |
| 1. Xylem |
a. Covers body surfaces |
| 2. Neuron |
b. Carries water up |
| 3. Epithelial |
c. Stores food in plants |
| 4. Parenchyma |
d. Carries electrical signals |
| 5. Cardiac Muscle |
e. Found only in heart |
Answers: 1-b, 2-d, 3-a, 4-c, 5-e
Part E — Draw and Label
Draw a Neuron.
Label these parts:
Cell Body, Nucleus, Dendrites, Axon, Axon Terminals.
✅ Detailed Solutions — Section 5 Take-Home Handout
Part A — Fill in the Blanks (Answers)
- A group of similar cells doing one job is called a tissue.
- Meristematic tissue divides fast and helps plants grow taller. It is found at root tips and shoot tips.
- Xylem carries water (and dissolved minerals) upward from roots to leaves.
- The muscle found only in the heart is called cardiac muscle. It is involuntary and never gets tired.
- Sclerenchyma cells are dead. They have very thick walls and provide maximum support to plants.
Part B — True or False (Answers)
- False. Phloem carries food (prepared by leaves) downward to the rest of the plant. Xylem carries water upward.
- False. Smooth muscle has no stripes. It is spindle-shaped and found in organs like the stomach and intestine.
- True. Parenchyma cells have thin walls and are loosely packed with spaces between them. They store food and water.
- True. Neurons (nerve cells) carry electrical messages from one part of the body to another through dendrites and axons.
- False. Epithelial cells are tightly packed with no gaps between them. This is what makes them good at covering and protecting surfaces.
Part C — Solve (Step-by-Step)
Problem 1: Alive cells, thick corners, bend but don't break. Name this tissue.
1The tissue is alive — so it is not sclerenchyma (which is dead).
2Corners are thick — this is the key feature that makes collenchyma flexible.
3It bends because the thickening is only at the corners (not all around), so the cell can flex without snapping.
✅ Answer: Collenchyma. It bends because the thickening is at the corners only, leaving the rest of the wall flexible. Found in leaf stalks.
Problem 2: Three types of connective tissue and one job each.
1Blood — carries oxygen from the lungs to every cell in the body.
2Bone — gives the body its shape and structure; protects internal organs.
3Fat (Adipose tissue) — stores energy and also insulates the body to maintain warmth.
✅ Other acceptable answers: cartilage (cushions joints), tendons (connect muscles to bones), ligaments (connect bones to bones).
Problem 3: Differences between xylem and phloem (at least two).
1Direction: Xylem carries water UP; Phloem carries food DOWN.
2Living or dead: Xylem cells are mostly dead; Phloem cells are mostly alive.
3What they carry: Xylem carries water and minerals; Phloem carries food (sugars made by leaves).
✅ Memory tip: X-Up — Xylem carries water Up!
Part D — Match the Columns (Answers already given in the handout)
Correct answers: 1-b, 2-d, 3-a, 4-c, 5-e
- Xylem → b. Carries water up
- Neuron → d. Carries electrical signals
- Epithelial → a. Covers body surfaces
- Parenchyma → c. Stores food in plants
- Cardiac Muscle → e. Found only in heart
Part E — Draw a Neuron (Guidance)
Your neuron drawing should clearly show:
- Cell Body: Large oval shape in the middle containing the nucleus.
- Nucleus: Circle inside the cell body — this is the control centre.
- Dendrites: Short, branching tree-like extensions coming OUT of the cell body on one side — they RECEIVE messages.
- Axon: One long, thin extension going from the cell body — it SENDS messages forward. (Much longer than dendrites.)
- Axon Terminals: Small bulb-like endings at the tip of the axon — these pass the message to the next cell.
- Draw a direction arrow on the axon showing: signal travels from dendrites → cell body → axon → axon terminals.