Class 9 Science — Chapter 6: TISSUES

What you'll learn

• ▸Concept of Tissues and Division of Labour
• ▸Comparison of Plant and Animal Tissues
• ▸Meristematic Tissues in Plants
• ▸Permanent Tissues and Differentiation
• ▸Parenchyma Tissue
• ▸Collenchyma Tissue
• ▸Sclerenchyma Tissue
• ▸Epidermis and Stomata

Chapter Summary

--- PAGE 1 --- Chapter 6 0964CH06 TISSUES From the last chapter, we recall that all living organisms are made of cells. In unicellular organisms, a single cell performs all basic functions. For example, in Amoeba, a single cell carries out movement, intake of food, gaseous exchange and excretion. But in multi- cellular organisms there are millions of cells. Most of these cells are specialised to carry out specific functions. Each specialised function is taken up by a different group of cells. Since these cells carry out only a particular function, they do it very efficiently. In human beings, muscle cells contract and relax to cause movement, nerve cells carry messages, blood flows to transport oxygen, food, hormones and waste material and so on. In plants, vascular tissues conduct food and water from one part of the plant to other parts. So, multi-cellular organisms show division of labour. Cells specialising in one function are often grouped together in the body. This means that a …

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Explain tissue differentiation simply. Get Solution →
2. Show me a diagram of plant tissues. Get Solution →
3. Give examples of animal tissues. Get Solution →
4. What is a group of cells that are similar in structure and/or work together to achieve a particular function called? Get Solution →
5. Which meristem is present at the growing tips of stems and roots? Get Solution →
6. Which simple permanent tissue generally stores food? Get Solution →
7. The husk of a coconut is made of which type of tissue? Get Solution →
8. What are the small pores found in the epidermis of a leaf called? Get Solution →

Did you know?

• 💡 Our skin completely replaces itself with new tissue every 27 days.
• 💡 A chameleon changes color using special pigment cells in its skin tissue.
• 💡 Trees have dead woody tissue that helps them stand tall for centuries.
• 💡 Scientists can now grow tiny human organ tissues in a lab.
• 💡 The longest single cell in the human body is a nerve cell.

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