Meristematic cells lack vacuoles because they divide continuously and need dense cytoplasm for active metabolism. Large vacuoles would occupy space and reduce the efficiency of rapid cell division required for plant growth and tissue formation.
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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.
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.