NCERT Important Questions Class 9 Science biology Chapter 6
Important NCERT Extra Questions
Chapter 6 Tissues
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
What is the utility of tissues in multicellular organisms?
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– Tissues in multicellular organisms are specialized groups of cells working together for specific functions.
– Epithelial tissues protect surfaces externally and internally, aiding in absorption and secretion.
– Connective tissues support and bind organs, including bone, cartilage, blood, and tendons.
– Muscle tissues (skeletal, cardiac, and smooth) enable voluntary and involuntary movements.
– Nervous tissues transmit electrical impulses, fostering rapid communication within the body.
– Collectively, tissues form organs, contributing to maintenance, repair, and adaptation.
– They facilitate integration, quick responses to stimuli, and immune protection against threats.
– Tissues are fundamental in maintaining bodily functions, adapting to changes, and ensuring overall well-being.
In multicellular organisms there are millions of cells. Most of these cells are specialised to carry out a few functions. Each specialized function is taken up by a different group of cells or tissues. Since these cells of a tissue carry out only a particular function, they do it very efficiently. For example, in human beings, muscle cells contract and relax to cause movement, nerve cells carry messages and blood flows to transport oxygen, food, form ones and waste materials and so on. Likewise, in plants, vascular tissues (xylem, phloem) conduct water and food from one part of the plant to other parts. So, multicellular organisms show division of labour.