Class 7 Science

The “Wastewater Story” chapter emphasizes the need for clean water and proper wastewater management. Sewage, a mix of domestic and industrial waste, requires treatment to remove pollutants through physical, chemical, and biological processes. Everyone plays a role in minimizing waste, maintaining sanitation, and preventing waterborne diseases. Water, Our Lifeline What Is Sewage? Water Freshens Up […]

Visit to a Forest Forests Give Us Stuff Observing Trees Decomposition and Heat Why Forests Matter Forests are super important! They’re like a big, green lifeline for animals, plants, and people. They give us stuff we use every day, keep the air and water clean, and make sure nature stays balanced. Next time you see

Light is an essential part of our daily lives, helping us see the world around us. From mirrors to lenses, it follows fascinating principles that explain reflection, image formation, and even the colors in sunlight. Understanding these concepts not only helps us grasp how vision works but also how optical instruments like magnifying glasses and

This chapter explores electric current and its effects, including heating and magnetic effects, as well as applications like electromagnets and electric bells. Electric components are represented by symbols for easy circuit diagrams. The heating effect occurs when a wire gets hot from electric current, used in heaters and bulbs, with heat depending on the wire’s

This chapter introduces the fundamental concepts of motion and time. It covers the definition and measurement of speed, the distinction between uniform and non-uniform motion, and the methods used to measure time, including the simple pendulum. SLOW OR FAST When evaluating how objects move, it’s clear that some travel more quickly than others, and even

Plants have two primary methods of reproduction: asexual and sexual. Asexual Reproduction Asexual reproduction allows plants to create offspring without seeds. One common form is vegetative propagation, where new plants emerge from parts like roots, stems, leaves, or buds. This process relies on the plant’s vegetative structures. Examples include: Budding Budding is an asexual reproduction

The circulatory system in animals facilitates nutrient, oxygen, and waste transportation via the heart and blood vessels, including arteries, veins, and capillaries. Excretion removes metabolic wastes, with variations across species and specific mechanisms in humans. Plants utilize xylem for water and mineral transport, and phloem for food distribution, while transpiration drives water movement. These biological

Respiration enables energy release from food through cellular mechanisms. Breathing mechanics, including inhalation and exhalation, and diverse respiratory adaptations in animals, such as gills for aquatic organisms and tracheal systems in insects, are examined. Plant respiration, utilizing stomata and root air spaces, is also covered, providing a concise understanding of gas exchange across living systems

“Physical changes involve alterations in the shape, size, color, or state of a substance, such as melting ice or cutting paper, without forming new materials. Chemical changes, like rusting of iron or burning magnesium, result in the formation of new substances and are crucial in processes like digestion and photosynthesis. Rusting, a common chemical change,

Acids, bases, and salts are chemical substances with distinct properties. Acids taste sour, while bases taste bitter and feel soapy. Natural indicators like litmus, turmeric, and China rose help identify acidic or basic solutions. Neutralization occurs when acids and bases react, forming salt, water, and heat. This process has practical uses, such as treating indigestion,