Cell - Structure and Functions
Telangana Board · Class 9 · Biology
Flashcards for Cell - Structure and Functions — Telangana Board Class 9 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a cell and why is it called the basic unit of life?
Answer
A cell is the smallest structural and functional unit of all living organisms. It is called the basic unit of life because: 1) All living things are made of cells, 2) Cells carry out all life processe…
Cell membrane (Plasma membrane)
Answer
The flexible outer boundary of animal cells and inner boundary of plant cells, made of lipids and proteins. It is selectively permeable, meaning it controls what enters and exits the cell. Functions i…
What is meant by 'selectively permeable membrane' and why is this property important?
Answer
A selectively permeable membrane allows only certain substances to pass through while blocking others. This property is crucial because: 1) It maintains the specific internal environment of the cell, …
Compare the structure and location of cell wall and cell membrane in plant cells.
Answer
Cell Wall: Tough, rigid outer layer made of cellulose, provides shape and protection, porous structure, located outside the cell membrane. Cell Membrane: Flexible inner layer made of lipids and protei…
Nucleus
Answer
The largest and most prominent organelle in eukaryotic cells, discovered by Robert Brown in 1831. It contains genetic material (DNA), controls all cell activities, and is surrounded by a nuclear membr…
Differentiate between prokaryotic and eukaryotic cells with examples.
Answer
Prokaryotic cells: No membrane-bound nucleus, genetic material freely distributed in cytoplasm, no membrane-bound organelles (except ribosomes), smaller and simpler. Examples: Bacteria, Blue-green alg…
What is cytoplasm and what does it contain?
Answer
Cytoplasm is the jelly-like fluid that fills the cell between the cell membrane and nucleus. It contains water, salts, organic molecules, and various cell organelles like mitochondria, endoplasmic ret…
Endoplasmic Reticulum (ER)
Answer
A network of membranes throughout the cytoplasm that forms channels for transport. Two types: Rough ER (with ribosomes) - synthesizes proteins; Smooth ER (without ribosomes) - synthesizes lipids and d…
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