Life Processes in Living Organisms — Maharashtra (SSC) Class 9 Science Solutions (Free)
Free step-by-step Maharashtra (SSC) Class 9 Science solutions for "Life Processes in Living Organisms" — important questions with detailed answers, download PDF for board exam preparation.
TL;DR: Free step-by-step Maharashtra (SSC) Class 9 Science solutions for "Life Processes in Living Organisms" — important questions with detailed answers, do…
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Q1: Define nutrition. What are the two types of nutrition in organisms?
Nutrition is the process by which organisms obtain and utilize food for growth, energy, and maintenance. Two types: 1) Autotrophic nutrition - organisms like plants manufacture their own food using light energy. 2) Heterotrophic nutrition - organisms like animals obtain food from other organisms.
Q2: Explain the process of photosynthesis in plants.
Photosynthesis occurs in chloroplasts using sunlight, water, and carbon dioxide to produce glucose and oxygen. Equation: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2. This provides food for the plant and releases oxygen essential for respiration.
Q3: What is respiration? Distinguish between aerobic and anaerobic respiration.
Respiration is the process of breaking down glucose to release energy. Aerobic respiration uses oxygen and occurs in mitochondria, yielding maximum energy (38 ATP). Anaerobic respiration occurs without oxygen in cytoplasm, producing less energy and lactate or ethanol as byproducts.
Q4: Describe the structure and function of a mitochondrion.
Mitochondrion has a double membrane envelope with inner folds called cristae. It contains enzymes for cellular respiration. Function: Powerhouse of the cell - breaks down glucose to produce ATP, the main energy currency for all cellular activities.
Q5: What is cell division? Name two types of cell division.
Cell division is the process by which a cell reproduces to form new cells. Two types: 1) Mitosis - produces two identical daughter cells for growth and repair. 2) Meiosis - produces four non-identical gametes with half the chromosomes for sexual reproduction.
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