Tissues in Action
NCERT Class 9 Science • Chapter 3
Quick Answer
In this Class 9 chapter, students learn how groups of similar cells form tissues that perform specific functions. It covers plant tissues (meristematic and permanent, including parenchyma, collenchyma, sclerenchyma, xylem and phloem) and animal tissues (epithelial, connective, muscular, and nervous), showing how tissues organise into organs.
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Key Terms
- Tissue
- A group of similar cells that work together to perform a specific function in a plant or animal.
- Meristematic Tissue
- Plant tissue made of actively dividing cells responsible for growth, found in regions like root and shoot tips.
- Xylem
- The plant vascular tissue that transports water and dissolved minerals from the roots upward to the rest of the plant.
- Phloem
- The plant vascular tissue that transports food, mainly sugars made in the leaves, to other parts of the plant.
- Epithelial Tissue
- Animal tissue that covers body surfaces and lines cavities and organs, providing protection and aiding absorption and secretion.
- Connective Tissue
- Animal tissue that links, supports, and binds other tissues and organs, including bone, cartilage, blood, and adipose tissue.
- Nervous Tissue
- Animal tissue made of neurons that receive and transmit electrical impulses, enabling rapid communication and response.
Frequently Asked Questions
What is a tissue in biology?▾
A tissue is a group of similar cells that are organised to perform a particular function together. Tissues allow division of labour so that different parts of an organism specialise in different jobs.
What is the difference between meristematic and permanent plant tissue?▾
Meristematic tissue consists of dividing cells that drive plant growth, while permanent tissue is made of cells that have stopped dividing and taken on specific roles such as support, storage, or transport.
What is the function of xylem and phloem?▾
Xylem carries water and minerals upward from the roots, while phloem transports food made in the leaves to other parts of the plant. Together they form the plant's transport system.
What are the four main types of animal tissue?▾
The four main animal tissues are epithelial tissue for covering and lining, connective tissue for support and binding, muscular tissue for movement, and nervous tissue for transmitting impulses.
Why are different types of tissues needed in the body?▾
Different tissues are specialised for different functions, allowing the body to perform many tasks efficiently. This division of labour lets organs and systems work in a coordinated way.
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