9th Class Biology – Short Questions & Answers
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Explain the role of various cell organelles.
Nucleus: Stores genetic material and controls cell activities. Mitochondria: Produce energy for the cell in the form of ATP. Ribosomes: Synthesize proteins. Endoplasmic Reticulum: Synthesizes lipids and proteins; rough ER has ribosomes, while smooth ER does not. Golgi Apparatus: Modifies and packages proteins for transport. Lysosomes: Break down waste materials and cellular debris.
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Name any two examples of each kingdom.
Monera: Bacteria, Cyanobacteria; Protista: Amoeba, Paramecium; Fungi: Yeast, Mushroom; Plantae: Oak tree, Rose; Animalia: Lion, Elephant.
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Discuss the differences between prokaryotic and eukaryotic cells.
Prokaryotic cells lack a nucleus and membrane-bound organelles, are usually unicellular, and are found in organisms like bacteria. Eukaryotic cells have a defined nucleus, contain membrane-bound organelles, and can be unicellular or multicellular (e.g., plants, animals).
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Discuss the five-kingdom classification system.
The five-kingdom classification system divides life into five groups based on cellular structure, nutrition, and reproduction. The five kingdoms are: Monera: Unicellular organisms, prokaryotic, including bacteria; Protista: Unicellular or simple multicellular eukaryotic organisms, such as protozoa and algae; Fungi: Eukaryotic organisms, non-photosynthetic, absorb nutrients from other organic matter (e.g., mushrooms, molds); Plantae: Multicellular, photosynthetic eukaryotes…
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What is the cell cycle?
The cell cycle is the series of events that lead to the division of a cell and the formation of two daughter cells. It includes phases like interphase and mitosis.
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Explain the concept of binomial nomenclature with examples.
Binomial nomenclature is the system of naming species using two parts: the first part is the genus name (capitalized), and the second part is the species name (lowercase). For example, in Homo sapiens, Homo is the genus, and sapiens is the species.
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Describe the importance of preserving biodiversity.
Preserving biodiversity is crucial for maintaining ecosystem health, supporting agricultural productivity, and ensuring that species can adapt to environmental changes. It also provides genetic resources for medicine, food, and other human needs.
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Define a cell.
A cell is the basic structural and functional unit of life, capable of performing all necessary biological functions.
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What are prokaryotic cells?
Prokaryotic cells are unicellular organisms that lack a membrane-bound nucleus and other membrane-bound organelles (e.g., bacteria).
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What are eukaryotic cells?
Eukaryotic cells are cells that contain a membrane-bound nucleus and other organelles, and they can be unicellular or multicellular (e.g., plant and animal cells).
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