Disclaimer: This note is summarized for quick revision for SSC Biology students. If you'd like, I can: Add a description of a plant cell. Expand on the different types of epithelial tissue .
Selectively permeable – Fluid Mosaic Model. 📌 Cell Wall (Plant only): Made of Cellulose – provides rigidity. 📌 Nucleus: Contains DNA + Nucleolus (makes ribosomes). 📌 Mitochondria: "Powerhouse" – produces ATP (Energy). 📌 Ribosomes: Protein synthesis. 📌 Endoplasmic Reticulum (ER): Rough (has ribosomes) → Protein transport; Smooth (no ribosomes) → Lipid synthesis. 📌 Golgi Body: Packaging & secretion. 📌 Lysosomes: "Suicidal bags" – contains digestive enzymes. 📌 Plastids (Plant only): Chloroplast (photosynthesis), Chromoplast (color), Leucoplast (storage). 📌 Vacuole: Storage (large in plants, small in animals).
Contains hydrolytic enzymes for intracellular digestion and autolysis (cellular self-destruction). 2. Nucleus: The Control Centre
Cylindrical, multinucleated, unbranched fibers with distinct bands. Controlled by conscious will (e.g., Limb muscles).
Cube-shaped cells (e.g., kidney tubules). Functions in secretion and absorption. ssc biology chapter 2 hand note exclusive
Dense, dark body rich in RNA; synthesizes ribosomes.
This exclusive hand note for covers the essential concepts and structures required for the exam. I. Core Cell Structures & Functions
A network of tubular membranes. Rough ER is studded with ribosomes and synthesizes proteins; Smooth ER lacks ribosomes and synthesizes lipids.
To maximize your score in both Multiple Choice Questions (MCQs) and Creative Questions (CQs), keep these insights in mind: Disclaimer: This note is summarized for quick revision
This exclusive hand note condenses complex textbook theories into structured, high-yield points, definitions, and differences designed for quick revision and maximum marks. 1. The Cellular Level of Life
This highly specialized tissue is designed to perceive external or internal stimuli and transmit electrochemical impulses rapidly throughout the body. The fundamental structural and functional unit of the nervous system is the . A neuron consists of:
Movement. (Striated/Voluntary, Smooth/Involuntary, and Cardiac).
Mastering Chapter 2 of the SSC Biology syllabus is essential for securing a top grade in your board exams. This chapter, titled forms the bedrock of biological science. Selectively permeable – Fluid Mosaic Model
: Actively dividing cells responsible for growth.
Cells that retain the capacity to divide actively. They are characterized by thin cell walls, dense cytoplasm, large nuclei, and an absence of vacuoles. They are responsible for primary and secondary growth. 2. Permanent Tissue
: Found throughout the cytoplasm, they digest and break down old organelles.
Which tissue provides gritty texture to pears? →