CHAPTER 2 : CELL AS THE BASIC UNIT OF LIFE
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1 CHAPTER 2 : CELL AS THE BASIC UNIT OF LIFE Parts of microscope : An instrument that magnifies minute objects so they can be seen easily. It is one of the most important tools of science. Physicians and biologists use microscopes to examine bacteria and blood cells. Eyepiece Magnify the specimen by 10x. Rough focus knob Change the position of the objective lens when focusing with low-powered objective lens. Fine focus knob Change the position of the objective lens slightly for fine focusing. Used with highpowered objective lens. Objective lens Magnify the size of a specimen by 4x, 10x or 40x. Stage Place the glass slide. Clip Hold the slide on the stage. Diaphragm Control the amount of light entering objective lens. There are four basic kinds of microscopes : Optical or light microscope Electron microscope Scanning probe microscope Ion microscope Mirror Reflects light up through an opening un the stage to illuminate the specimen. Base Stabilize the microscope. 1
2 Chloroplast Vacuole Cell wall Cell membrane Nucleus Cytoplasm Structure of cell Nucleus Vacuoles Chromosomes Cytoplasm Cell membrane Cell wall Chloroplasts Function Control all activities of the cell Stores salt and sugar solutions, hold waste substances Determines how an organism behaves (genetic information) A place where all chemical reactions take place Control the movement of substances into or out of the cell Support and gives the cell a regular shape A place where plants make food by photosynthesis. Contain chlorophyll which is used to trap sunlight for photosynthesis. 2
3 Cytoplasm Nucleus } Protoplasm Cell membrane Structure of the cell Nucleus Function Controls all the activities of the cell Cytoplasm Cell membrane A place where all chemical reaction take place. Stores dissolves material Controls the movement of material in and out of the cell 3
4 Comparing Animal Cell and Plant Cell Similarities Both have nucleus, cytoplasm and cell membrane. Plant cell Differences between plant cells and animal cells Animal cell Regular shape shape Irregular shape With chloroplasts chloroplasts Without chloroplasts With a cell wall cell wall (cellulose) Large vacuoles vacuoles Without cell wall Has no vacuole except in unicellular 4
5 Review 1 : Animal Cell and Plant Cell 1. What is the basic unit of living things? 2. What makes up the protoplasm of a cell? 3. What can be found in plant cells but not in animal cells? 4. State the substances that builds up the cell wall of plants cells. 5. Draw an animal cell and plant cell. Animal cell Plant cell 5
6 UNICELLULAR AND MULTICELLULAR ORGANISMS Made up of one cell only. Uni means one. Carry out life processes inside the cell. Absorbs nutrients, expel wastes and exchange gas with their environment. A simple organism Mostly are aquatic living things (in ponds, drains and the sea). Do not have circulatory system. Also known as microorganism (microbe) Examples : Paramecium, Amoeba, yeast, Pleurococcus, Chlamydomonas. Asexual reproduction (Fission) 6
7 Made up of many cell. Multi means many. Examples : Human beings, birds, fish Hydra, Spirogyra, moss, earthworm, Mucor. More complex than unicellular organism Life process are more complex. Various types of cell work together to perform a specific task 7
8 Review 2 : Unicellular Cell and Multicellular Cell 1. What is unicellular organism? 2. What is multicellular organism? 3. Give two examples of unicellular organism. (a) (b) 4. Give two example of multicellular organism. (a) (b) 5. Why is human being classified as multicellular organism? 6. Identify unicellular organisms and multicellular organisms given below. Euglena Paramecium Spirogyra Chlamydomonas Hydra Mosquito Amoeba Moss Scorpion Cockroach Unicellular Organisms Multiicellular Organisms 8
9 7. Name the organism below. (a) (b) (c) (d) (e) (f) 9
10 ORGANISATION OF CELL IN THE HUMAN BODY Cell organization is the grouping of simple cell into more complex structures. CELL TISSUE ORGAN SYSTEM ORGANISM Basic unit of life The smallest structures capable of basic life processes ORGANISM All system in the body function in a coordinated manner to form a multicellular organism. CELL Examples : Epithelium cell Red blood cell White blood cell Cardiac muscle cell Bone cell Nerve cell Reproductive cell Groups of organs form organ systems Each organ system carries out a major activity in the body. Examples : - Reproductive system - Blood circulatory system - Digestive system SYSTEM - - Excretory system - Respiratory system - Muscular system A group of similar cells that work together to perform a particular function. TISSUE Four main types : - Epithelial tissue - Muscle tissue - Connective tissue - Nervous tissue ORGAN An organ consists of two or more kinds of tissues joined into one structure that has a certain task. Examples : - The heart - The kidney - The lungs - The stomach - The liver - The brain 10
11 Type of human cell Red blood cell Nerve cell Structure Respective function Transports vital food and oxygen to all parts of the body. Carries messages in the form of electrical impulses around the body. White blood cell Protects the body from damage by invaders Human cell Bone cell sperm Takes part in fertilisation to produce young ones. Form bones to support the body and protect organs. Human egg cell If the egg is fertilised it will develop into an embryo. Epithelial cell It protects the internal and external parts of the body. Muscle cell Contracts and relaxes to move parts of the body. 11
12 The Lymphatic System Body s defences against infection The Reproductive System For reproduction The Skeletal System Protect internal organ. Provides body support The Nervous System Detect stimuli and responds to them. The Blood Circulatory System Supplies the cells of the body with the food. Transport waste product. VARIOUS SYSYEM IN THE HUMAN BODY The Endocrine System Produces, stores and secretes chemical substances known as hormones. The Respiratory System Supplies oxygen and aids removing of carbon dioxide The Muscular System Enables body movement. The Excretory System Removes waste products from body. The Digestive System Processes food (ingestion, digestion, absorption). 12
13 Review 3 : Organisation of Cell 1. State the following structures as cell, tissue, organ or system. (a) Sperm - (b) Stomach - (c) Ovum - (d) Brain - (e) Digestive - (f) eardrum - 2. Complete the cell organization below. Organism 3. State the name of each organ shown below and the system it belongs to. (a) (b) Organ : System : Organ : System : (c) (d) Organ : System : Organ : System : 13
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