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.
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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.
In multicellular organisms, specialised cells form tissues, tissues form organs and organs form systems. Each structure performs particular functions efficiently. This division of labour improves coordination, reduces workload on individual cells and enables organisms to perform complex life processes successfully.
Plant tissues mainly provide support, transport and continuous growth because plants remain fixed in one place. Animal tissues help movement, coordination and rapid responses because animals move actively. Structural differences arise from different lifestyles, nutrition methods and body requirements.