Cell Biology and Organisation

2.4.1 Cell Structure and Function (Structured Question 1 & 2)

Question 1:Diagram below shows a plant cell as seen under an electron microscope.(a)(i) On the diagram, label the structures A, B, C and D. (2 marks)(a)(ii) State the function of structure A and structure D. (2 marks)(b) Explain the role of C to maintain cell turgidity. (2 marks)(c) Every somatic cell which contains structure B … Read more

2.2.2e Involvement of Systems in Maintaining an Optimal Internal Environment

Internal Environment of Multicellular OrganismThe internal environment of a multicellular cell is referring to the medium surrounding the cell.It consists of blood plasma and interstitial fluid. (also called the extracellular fluid)HomeostasisHomeostasis is the property of a system, especially a living organism, that regulates its internal environment so as to maintain a stable, constant condition.Factors Affecting … Read more

2.2.2d Organ System

Different organ work together form an organ system.The human body has eleven different organ system, namely theCirculatory SystemDigestive SystemReproductive SystemEndocrine SystemNervous SystemRespiratory SystemMuscular SystemSkeletal SystemExcretory SystemLymphatic System (Immune System)Integumentary SystemCirculatory SystemOrgan: Heart, Blood VesselFunction: Transport nutrients, gases and wastes to and from cells, helps fight diseases and helps stabilize body temperature and pH to maintain … Read more

2.2.2a Cell

Cell specialisationCell specialisation means division of labour among cells. Each type of cell specialises in a specific function.Importance of Cell SpecialisationCells can perform specific task with greater efficiency.Enable multicellular organisms adapt to various environment.Cell Specialisation in Animal Cell Function Red blood cells Transport oxygen White blood cells Destroy microorganisms. Engulf foreign substance in the blood … Read more