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 Biology Class 9 Quiz – 10 Important MCQs with Answers Test your knowledge with this Biology Class 9 quiz featuring 10 important multiple-choice questions (MCQs) with correct answers and explanations. Perfect for exam preparation and self-assessment. Biology Class 9 Quiz Biology Class 9 - Quiz (10 MCQs) 1. The basic unit of life is: Tissue Cell Organ Organ system 2. Which organelle is known as the powerhouse of the cell? Ribosome Mitochondria Nucleus Golgi apparatus 3. Photosynthesis takes place in which cell organelle? Mitochondria Ribosome Chloroplast Endoplasmic Reticulum 4. Which tissue connects muscles to bones? Tendon Ligament Cartilage Areolar tissue ...

Mitosis—A Detailed Study of Cell Division Introduction All living organisms grow, develop, and maintain themselves through cell division. One of the most important types of cell division is mitosis , which ensures that new cells formed are genetically identical to the parent cell. This process is essential not only for the continuity of genetic material but also for the survival and evolution of life. Mitosis was first described by the German biologist Walter Flemming in 1882 when he studied the thread-like structures (chromosomes) inside the nucleus. The word mitosis comes from the Greek word mitos , meaning “thread,” referring to the thread-like appearance of chromosomes during division. Definition of Mitosis Mitosis is the type of equational nuclear division in which a single parent cell divides to produce two daughter cells, each having the same number and type of chromosomes as the parent. It is followed by cytokinesis , the division of the cytoplasm. It occurs in soma...