Kerala Board Class 9 Biology — Flashcards for Quick Revision

A: 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

A: 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

A: 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,

A: A tissue is a group of cells that are similar in structure and perform similar functions together. Example: Xylem tissue consists of similar cells that all work together to transport water and mineral

A: The four basic types of plant tissues are: 1) Meristematic tissues (growth and repair), 2) Dermal tissues (outer coverings), 3) Ground tissues (bulk of plant body, packing), 4) Vascular tissues (trans

A: Meristematic tissues bring about overall growth and repair in plants. Key characteristics: Small cells with thin cell walls, living cells with prominent nucleus and abundant cytoplasm, compactly arran

A: The four major types of animal tissues are: 1. Epithelial tissue - covers and protects body surfaces 2. Connective tissue - provides support and connects organs 3. Muscular tissue - responsible for bo

A: A tissue that covers and protects the body from inside and outside. It forms the outer layer of skin, lining of mouth, blood vessels, lung alveoli, and kidney tubules. Cells are tightly packed with no

A: Squamous epithelium: Flat, thin cells found in mouth lining, blood vessels, lung alveoli - allows easy diffusion. Cuboidal epithelium: Cube-shaped cells in kidney tubules, salivary glands - provides m