1. What is Sound? Sound is a form of energy which produces a sensation of hearing in our ears. Sound is produced by vibrating objects. Examples include vibrating tuning fork, vocal cords in humans, bells, musical instruments, etc. Vibration: Rapid to-and-fro (back and forth) motion of an object. Short Question: Can sound be produced without vibration? Answer: No, sound cannot be produced without vibration. 2. Medium of Sound The substance through which sound travels is called a medium . Sound can travel through solids, liquids, and gases but cannot travel through vacuum . Process of Sound Propagation: When an object vibrates, it makes the air particles around it vibrate. These air particles move back and forth from their original (rest) position. The vibrating air particles push nearby air particles. This causes the nearby particles to also start vibrating. In this way, vibrations pass from one particle to another. This process continues through the medi...
What Are Tissues? Group of cells with a common origin and similar function are called tissues. Multicellular organisms have specialized cells forming tissues. Utility: Provide structure, mechanical strength, and division of labor. Types of Tissues Plant Tissues Animal Tissues Plant Tissues 1. Meristematic Tissues Cells actively divide for growth. Intercellular spaces are absent. Shapes: spherical, oval, polygonal, or rectangular. Have thin walls, few/no vacuoles, dense cytoplasm, prominent nuclei. Type Location Function Apical Tips of stems/roots Increase length (primary growth) Intercalary Base of leaves/internodes Longitudinal growth Lateral Sides of stems/roots Increase thickness (secondary growth) 2. Permanent Tissues Cells loose ability to divide, differentiate to...