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Geography Unit 5 👉Primary Sector The primary sector involves the extraction and harvesting of natural resources. This includes activities that directly utilize natural resources such as agriculture, fishing, forestry, mining, and hunting. The primary sector is fundamental as it provides the raw materials needed for other sectors of the economy. 👉Secondary Sector The secondary sector encompasses industries that process, transform, and manufacture raw materials obtained from the primary sector into finished goods. This includes manufacturing, construction, and production industries. The secondary sector adds value to raw materials by turning them into products that can be sold to consumers or other businesses. 👉Tertiary Sector The tertiary sector focuses on providing services rather than goods. This includes a wide range of activities such as retail, healthcare, education, finance, hospitality, and entertainment. The tertiary sector plays a crucial role in supporting the primary and secondary sectors by providing services that facilitate their operations and meet consumer needs. 👉Quaternary Sector The quaternary sector involves knowledge-based activities and services that require specialized knowledge and expertise. This includes research and development (RD), information technology, financial planning, education, and consulting services. The quaternary sector is increasingly important in modern economies as it drives innovation and contributes to economic growth through high-level services. #geo @knowledgebach9

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Biology   grade 9         Unit 2 👉Kingdom monera Monera includes eubacteria and archaebacteia . Eubacteria (true bacteria) have strong cell walls. They exist in various shapes and forms. Some eubacteria are hetrotrophs , other can make their own food. Some autotropic bacteria make their own food like plant, they are photosynthetic Others make energy by chemical reaction, they are chemosynthetic Eubacteria  live in most habitat. Most eubactria are harmless and helpful. Archeabacteria are a group of microorganisms considered to be an ancient form of life. That involved separately from the bacteria . Eubacteria are true bacteria. #bio @knowledgebach9

Biology grade 9 Unit 2 👉Kingdom monera Monera includes eubacteria and archaebacteia . Eubacteria (true bacteria) have strong cell walls. They exist in various shapes and forms. Some eubacteria are hetrotrophs , other can make their own food. Some autotropic bacteria make their own food like plant, they are photosynthetic Others make energy by chemical reaction, they are chemosynthetic Eubacteria live in most habitat. Most eubactria are harmless and helpful. Archeabacteria are a group of microorganisms considered to be an ancient form of life. That involved separately from the bacteria . Eubacteria are true bacteria. #bio @knowledgebach9

Bacteria 🦠🧫 Bacteria are single-celled microorganisms that belong to the domain Prokaryota. They are characterized by their simple cell structure, lacking a nucleus and membrane-bound organelles. Bacteria can be found in a wide variety of environments, including soil, water, and within the human body, where they play crucial roles in processes such as digestion and nutrient cycling. Bacteria can be classified in several ways, including: 1. Shape:    • Cocci (spherical)    • Bacilli (rod-shaped)    • Spirilla (spiral-shaped) 2. Gram Staining:    • Gram-positive (thick peptidoglycan layer in the cell wall)    • Gram-negative (thin peptidoglycan layer and an outer membrane) 3. Metabolism: 1. Autotrophic Bacteria: These bacteria can produce their own food. They can be further divided into:    • Photoautotrophs: Use light energy to convert carbon dioxide and water into glucose (e.g., cyanobacteria).    • Chemoautotrophs: Obtain energy by oxidizing inorganic substances and use that energy to convert carbon dioxide into organic compounds (e.g., some sulfur-oxidizing bacteria). 2. Heterotrophic Bacteria: These bacteria cannot produce their own food and must obtain organic compounds from their environment. They rely on other organisms (plants, animals, or decomposing matter) for nutrients (e.g., E. coli, which feeds on sugars and amino acids). #bio @knowledgebach9

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Mathematics Unit 5 👉 A circle is the locus of points (set of points) in a plane each of which is equidistant from a fixed point. 👉 A tangent line to a circle meets the circle in one point and is perpendicular to the radius. 👉 The line segment joining the center of a circle to the midpoint of a chord is perpendicular to the chord. 👉 A central angle is an angle formed by two radii witb vertex at the center of the circle. 👉 An inscribed angle is an angle with its vertex on the circle formed by two intersecting chords. 👉 A figure has a line of symmetry , if it can be folded so that one half of the figure concides with the other half. A figure that has one line of symmetry is called a symmetrical figure. 👉 A diameter perpendicular to a chord bisects the chord. 👉 The perpendicular bisector of a chord passes through the centre of the circle . 👉 In the same circle , equal chords are equidistant from the centre. 👉 Line segments that are tangents to a circle from an outside point are equal. #maths @knowledgebach9

Biology Unit 5

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