Ssc Biology Chapter 2 Hand Note Exclusive Updated [WORKING]

Below is an exclusive, detailed hand note covering all critical aspects of the chapter, structured for exam preparation and concept building.

Covers external surfaces and lines internal organs. Cells are tightly packed on a basement membrane.

Remember that the primary plant cell wall contains cellulose, hemicellulose, and pectin, whereas fungal cell walls are made of chitin.

The nucleus dictates all metabolic and genetic activities of the cell. It consists of four distinct parts: ssc biology chapter 2 hand note exclusive

Forms the internal framework. Includes Bone (hard, rigid, matrix rich in calcium) and Cartilage (flexible, semi-solid matrix; e.g., pinna of the ear, tip of the nose).

Absent in higher plant cells; present in animal cells (crucial for cell division).

: Cells with a true nucleus and membrane-bound organelles (e.g., plant and animal cells). 2. Key Cell Organelles & Functions : Known as the Below is an exclusive, detailed hand note covering

These cells lack a well-defined nucleus and membrane-bound organelles. The genetic material (DNA) floats freely in a region called the nucleoid. Membrane structure is limited to the plasma membrane. Examples include bacteria and blue-green algae.

Remember that Xylem conducts water (think "Xy" sound similar to "water physics" or "high to low"), while Phloem conducts food ("Ph" sounds like "F" for food).

These cells possess a highly organized, membrane-bound nucleus housing the genetic material. They contain specialized membrane-bound organelles. Examples include plant and animal cells. 2. Functional Classification: Somatic vs. Germ Cells Remember that the primary plant cell wall contains

Which plant tissue contains aerenchyma? →

Companion Cells (living cells with large nuclei that control sieve tube activities). Phloem Parenchyma (stores food).

The "Powerhouse." Site of oxidative phosphorylation and ATP production. Chloroplast: Green, conducts photosynthesis. Chromoplast: Coloured (red/yellow), attracts pollinators. Leucoplast: Colourless, stores food. Ribosomes: Protein factories of the cell. Golgi Body: Packaging and secretion center. Lysosomes: Contains digestive enzymes; acts as the "suicide bag." 3. Plant Tissues Simple Tissue: Made of one type of cell. Parenchyma: Thin-walled, living, stores food. Collenchyma: Thickened at corners (pectin), provides flexibility. Sclerenchyma:

The site of oxidative phosphorylation and cellular respiration. It generates Adenosine Triphosphate (ATP). It contains its own DNA and 70S ribosomes.

Tall, pillar-like cells (e.g., inner lining of the intestine) specialized for nutrient absorption.