This write-up covers the core essentials of SSC Biology Chapter 2: Cells and Tissues of Organisms
Thin, flat, scale-like cells (e.g., wall of Bowman’s capsule, blood vessels). Specialized for filtration and diffusion.
A group of cells with a common origin performing a specific function is a tissue. A. Plant Tissues
Thin, flat, scale-like cells (e.g., wall of Bowman’s capsule, blood vessels). Ideal for filtration and diffusion. ssc biology chapter 2 hand note exclusive
4. Endoplasmic Reticulum (এন্ডোপ্লাজমিক রেটিকুলাম) Has ribosomes (Protein synthesis). Smooth (SER): No ribosomes (Lipid synthesis). 5. Golgi Bodies (গলজি বস্তু) Function: Packaging and secretion of substances. 6. Lysosomes (লাইসোজোম)
Phloem Fibers or Bast Fibers (provide mechanical support; e.g., jute fibers). 4. Animal Tissues: Classification and Functions
Dead sclerenchyma cells providing mechanical strength. Phloem (Food Conducting Tissue) This write-up covers the core essentials of SSC
A dead/non-living outer layer unique to plant cells, primarily made of cellulose, hemicellulose, and lignin. 2. Cytoplasmic Organelles & Functions
Covers body surfaces and lines organs (protection).
The principal water-conducting tissue. It transports water and dissolved minerals upward from roots to leaves (unidirectional flow). It consists of four elements: tracheids , vessels (the primary conducting tubes), xylem parenchyma (living), and xylem fibers (dead mechanical support). Leukocytes (immune defense)
Covers the body surface and lines organs (e.g., skin).
A cell is the basic structural, functional, and hereditary unit of all living organisms. Plant Cell vs. Animal Cell
Draw a labeled diagram of an animal cell and a plant cell (5 marks). Practice both side-by-side on one page of your hand note.
Blood and Lymph. Blood contains plasma and three cell types: Erythrocytes (oxygen transport), Leukocytes (immune defense), and Thrombocytes (blood clotting).
Memorize the specific function of Mitochondria (ATP), Chloroplast (Photosynthesis), and Lysosome (Digestion).