Class 9 Science Chapter 3 Tissues in Action – Revision Notes

Tissues in Action sorts plant tissue into meristematic and permanent types and animal tissue into four functional groups, then moves on to how tendons, ligaments, and joints work together, and this page summarises all of it.

Last Updated: September 23, 2026

Plant Tissues

• Meristematic: actively dividing, responsible for growth (root/shoot tips, cambium).
• Permanent: specialised, non-dividing (xylem/phloem for transport, epidermis for protection).

Animal Tissues (4 types)

• Epithelial — covering/lining, protection/absorption/secretion.
• Connective — support/connection (bone, cartilage, blood, tendons, ligaments).
• Muscular — movement via contraction (skeletal, smooth, cardiac).
• Nervous — signal transmission (neurons).

Musculoskeletal System

• Tendon: muscle → bone. Ligament: bone → bone.
• Joint types: ball-and-socket (shoulder/hip, multi-directional), hinge (elbow/knee, one-plane), pivot (neck, rotation), fixed/fibrous (skull, no movement).

Health

• Protein, calcium, vitamin D + exercise → strong bones/muscles.

Quick visual: a worked diagram from the full Solutions page, for reference.

One-Line Summary

Tissues are groups of similar cells performing a shared function — plants have growing (meristematic) and specialised (permanent) tissue, animals have four types (epithelial, connective, muscular, nervous), and together with joints they form the musculoskeletal system that supports and moves the body.

Frequently Asked Questions

What is a tissue, and why do multicellular organisms need them?
A tissue is a group of similar cells that work together to perform a specific function; multicellular organisms need tissues because different cells specialise into groups to carry out tasks like movement, transport, and support more efficiently than single cells could alone.

What is the main difference between plant tissues and animal tissues covered in this chapter?
Plant tissues are broadly divided into meristematic (dividing) and permanent (non-dividing) tissues, while animal tissues are classified into epithelial, connective, muscular, and nervous tissues, each suited to different structural and functional needs.

Written by Satish

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