9th Class Biology – Short Questions & Answers
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What is the role of mitochondria in bioenergetics?
Mitochondria are known as the powerhouses of the cell. They generate ATP through the process of cellular respiration, converting nutrients like glucose into usable energy.
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What is cellular respiration?
Cellular respiration is a metabolic process in which cells break down glucose and other organic molecules to produce ATP. It occurs in three stages: glycolysis, the Krebs cycle, and oxidative phosphorylation.
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Explain the structure and function of animal tissues.
Animal tissues are classified into four types: 1. Epithelial Tissue: Covers the body and lines organs, providing protection and regulating secretion. 2. Connective Tissue: Provides structural support and connects different tissues (e.g., blood, bone, cartilage). 3. Muscular Tissue: Facilitates movement with skeletal, smooth, and cardiac muscles. 4. Nervous Tissue: Composed of neurons, it transmits electrical…
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What is the role of enzymes in biochemical reactions?
Enzymes lower the activation energy required for biochemical reactions, thereby speeding up the process.
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Discuss the organization of tissues into organs and organ systems.
Tissues combine to form organs, which perform specific functions. Multiple organs work together in organ systems to perform broader functions. For example, the heart (organ) is part of the circulatory system (organ system), which circulates blood throughout the body.
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Define biomolecules.
Biomolecules are organic molecules that are essential for life, including proteins, lipids, carbohydrates, and nucleic acids.
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What are carbohydrates?
Carbohydrates are organic compounds made of carbon, hydrogen, and oxygen. They serve as a primary energy source for living organisms.
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Name the types of carbohydrates.
Carbohydrates are classified into three types: 1. Monosaccharides 2. Disaccharides 3. Polysaccharides
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What are lipids?
Lipids are organic molecules that are insoluble in water and serve as energy storage molecules, as well as components of cell membranes.
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Define proteins.
Proteins are large, complex molecules made up of amino acids and are essential for body functions like growth, repair, and enzymatic activity.
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