The increase in girth is caused by continuous division of cells in the lateral meristem. These cells form new tissues concentrically inside and outside the stem, increasing diameter, producing annual rings and strengthening the plant body over time.
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Plant and animal tissues differ because plants are fixed and require support, transport and growth tissues. Animals move actively and need flexible tissues for movement, coordination and sensing. Their tissues develop differently according to nutrition methods, body structure and lifestyle.
Plants grow in girth through the activity of lateral meristem present along the stem circumference. These actively dividing cells produce new cells inside and outside, increasing stem thickness and forming annual growth rings in woody plants gradually.
In multicellular organisms, similar cells form tissues, tissues combine to form organs organs work together as organ systems and organ systems form an organism. This hierarchical organisation ensures proper coordination, efficient functioning and successful performance of complex life activities.
Life starts from a single cell called a zygote. It divides repeatedly through mitosis to form many cells. These cells differentiate into tissues organs and organ systems, eventually developing into a complete multicellular organism with specialised functions.