Covered in ribosomes; involved in protein transport. Smooth ER: Involved in lipid synthesis and detoxification.
A group of similar cells performing a common function is called tissue. Animal tissues are classified into four main types: A. Epithelial Tissue Protection, absorption, secretion.
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Contain enzymes for digesting old organelles and waste. Plastids (Plant Only): Chloroplasts: Contain chlorophyll for photosynthesis. Chromoplasts: Provide color to flowers and fruits. Leucoplasts: Store food. 3. Plant and Animal Tissues ssc biology chapter 2 hand note exclusive
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).
These hand notes are a concise summary of the chapter. Make sure to review and practice the concepts regularly to excel in your SSC Biology exam!
| Aspect | Mitosis | Meiosis | | :--- | :--- | :--- | | | Growth, repair, asexual reproduction | Gamete (sperm/egg) formation | | Location | Somatic (body) cells | Reproductive organs | | Division # | 1 division | 2 divisions (Meiosis I & II) | | Daughter cells | 2 diploid (2n) cells | 4 haploid (n) cells | | Genetic variation | No (identical clones) | Yes (crossing over) | Covered in ribosomes; involved in protein transport
| Type | Shape | Location | | :--- | :--- | :--- | | | Flat, scale-like | Lining of blood vessels, air sacs of lungs | | Cuboidal Epithelium | Cube-shaped | Kidney tubules, glands | | Columnar Epithelium | Tall, column-shaped | Lining of the stomach and intestines |
For every SSC candidate in Bangladesh (especially under the NCTB curriculum), is the foundation of your entire exam score. Without mastering this chapter, understanding circulation, respiration, or reproduction becomes impossible.
: The cell is the basic structural and functional unit of all living organisms. : Robert Hooke was the first to discover cells in 1665. Types of Cells Prokaryotic : Cells without a well-defined nucleus (e.g., bacteria). Eukaryotic Animal tissues are classified into four main types: A
Forms the structural framework of the body. It includes rigid, mineralized bone (containing osteocytes) and flexible, resilient cartilage (containing chondrocytes).
Multilayered cells resistant to wear and tear (e.g., skin epidermis).
Divided into three main types:
(Cell wall, Plastids, Vacuole size, Centrosome). Function of Mitochondria: Why is it called the power house?