Class 9 Science - GUJARAT
Tissues in Action
The chapter 'Tissues in Action' builds on your understanding of the fundamental unit of life by exploring how cells group together to form tissues. You will learn about plant tissues, including meristematic and permanent tissues like xylem and phloem, and animal tissues such as epithelial, connective, muscular, and nervous tissues. Understanding these microscopic structures is crucial because tissues make up organs and organ systems, keeping all living organisms functioning. For the Gujarat Board (GSEB) exams, this chapter is a major scoring area with direct questions on diagrams, differences between tissue types, and their specific functions in plants and animals.
Start Learning FreeKey Concepts
Tissue
A group of cells that are similar in structure and work together to achieve a particular function in the body.
Meristematic Tissue
Growing tissues found in specific regions of plants like root tips and shoot tips that are responsible for active cell division and plant growth.
Permanent Tissue
Derived from meristematic tissue where cells have lost the ability to divide and have taken up a permanent shape, size, and function.
Xylem and Phloem
Complex permanent tissues in plants; xylem conducts water and minerals upwards, while phloem transports food from leaves to other plant parts.
Epithelial Tissue
The covering or protective tissue in animal bodies that forms a barrier to keep different body systems separate.
Connective Tissue
Animal tissue specialized for binding and supporting other tissues or organs, examples include blood, bone, and cartilage.
Important Formulas
Board Exam Info
In the Gujarat (GSEB) Class 9 Science board exams, this chapter typically carries around 6 to 8 marks. Questions frequently include diagram-based questions (such as drawing nerve cells or stomata), distinguish-between questions (like meristematic vs permanent tissue or xylem vs phloem), and short descriptive answers about animal tissue functions.
Frequently Asked Questions
What is the main difference between meristematic and permanent tissues?
Meristematic tissues consist of actively dividing cells responsible for plant growth, whereas permanent tissues have lost the ability to divide and are specialized for specific functions like support or transport.
Why is blood considered a type of connective tissue?
Blood is considered a connective tissue because it connects different body parts by transporting oxygen, nutrients, wastes, and hormones, and it has a fluid matrix called plasma.
What are the components of xylem and phloem?
Xylem consists of tracheids, vessels, xylem parenchyma, and xylem fibres. Phloem consists of sieve tubes, companion cells, phloem parenchyma, and phloem fibres.
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