A selectively permeable lipid bilayer surrounding the protoplasm. It controls entry and exit of materials.

In the SSC exam, Biology Chapter 2 carries at least 12-15 marks (MCQ + Creative + Short answer). Master this exclusive hand note, and you guarantee an A+ in this section.

Here are the key concepts that you will learn in SSC biology chapter 2:

Composed of a single type of cell uniform in structure and function.

Involved in reproduction. 2. Structure of an Eukaryotic Cell An eukaryotic cell consists of three main parts: Cell Wall/Membrane Protoplasm Cell Vacuole A. Plant Cell Wall (কোষপ্রাচীর) Found only in plant cells (non-living). Composed of cellulose, hemicellulose, and pectin. Function: Protects the cell and provides shape. B. Protoplasm (প্রোটোপ্লাজম)

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

Elongated, dead cells with tapering ends and lignified walls.

A cell is the basic structural, functional, and hereditary unit of all living organisms. Understanding its architecture is crucial. 1. Classification of Cells

Contain a true nucleus enclosed by a nuclear membrane and various membrane-bound organelles. Example: Plant and Animal cells. Based on Function:

: Simple (Parenchyma, Collenchyma, Sclerenchyma) and Complex (Xylem and Phloem for transport).

Genetic material (DNA/RNA) that forms chromosomes during cell division. 5. Tissues (টিস্যু) - Plant and Animal

The site of protein synthesis. They can float freely or attach to the Endoplasmic Reticulum.

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