Natural Science Grade 9

Life and Living - Term 1

CELLS AS THE BASIC UNITS OF LIFE

Cell Structure

The cell (from the Latin word cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms

Plant and animal cells share the following features:

  • nucleus
  • cell membrane
  • cytoplasm 
  • organelles e.g.  mitochondria, vacuoles and chloroplasts

Interactive

Hover over the following 'i' icons to reveal the various parts of the cell.

Which of the following are shared by plant and animal cells (tick all applicable boxes)?

  • Cytoplasm
  • Nucleus
  • Cell Membrane
  • Cell Wall

Differences between plant and animal cells

Differences between Plant and Animal Cells

Plant cells differ from animal cells- plant and animal cells are enclosed by a cell membrane, and plant cells also have rigid cellulose cell walls to provide support for the plant- plant cells also contain organelles such as large vacuoles and chloroplasts.

  •  Chloroplasts contain chlorophyll to absorb light energy for photosynthesis.
  • Vacuoles in plant cells have several functions including support and storage (Vacuoles in animal cells are small and temporary or absent)

Plant Cell

Animal Cell

Indicate whether the following statements are TRUE or FALSE.

  • A vacuole is an example of a organelle.
  • Chlorophyll is found in the nucleus.

Cells in tissues, organs and systems

  • Cells come in many different shapes and sizes.
  • Cells are adapted to perform specific functions, such as muscle cells which are specialised to contract and enable movement.
  • Microscopic organisms such as bacteria, consist of a single cell.
  •  Macroscopic organisms such as humans, consist of large numbers of cells.
  •  A group of cells performing a specific function form a tissue, a group of tissues make up an organ, and organs working together in groups form systems, systems make up an organism.
  • Stem cells are cells that have the ability to divide and develop into many different cells.

Match the following terms with the correct definition.

  • Tissue
    A group of cells
  • Organ
    A group of tissues
  • System
    Organs working together
  • Organism
    Made up of systems

Systems in the human body - Body Systems

Digestive System

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Circulatory System

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

Respiratory System

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

Source: https://commons.wikimedia.org/wiki/Category:Respiratory_system#/media/File:Human_Lungs.gif

Musculosketal System

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Excretory System

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

Nervous System

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

HUMAN REPRODUCTION -

Purpose

The primary purpose of reproduction is for the male and female sex cells to combine for repopulation of the species.

What is Puberty?

Puberty is the stage of a person's life whereby the sexual organs mature in readiness for reproduction.

Puberty in Males

The pituitary gland  secretes hormones into the bloodstream and  activates the release of testosterone via the testes.

Secondary sexual characteristics include:

  • Deep Voice
  • Pubic Hair
  • Facial Hair

Puberty in Females

The pituitary gland secretes hormones into the bloodstream and activates the release of oestrogen via the testes

Secondary sexual characteristics include:

  • Enlarged breasts
  • Menstruation
  • Pubic Hair


Purpose and Puberty

Reproductive Organs

Stages of Reproduction

CIRCULATORY AND RESPIRATORY SYSTEMS

Breathing, gaseous exchange, circulation and respiration

DIGESTIVE SYSTEM

Healthy Diet

The Alimentary Canal and Digestion

Matter and Materials - Term 2

COMPOUNDS

The Periodic Table

Names of compounds

CHEMICAL REACTIONS

Chemical equations to represent reactions

Balanced equations

REACTIONS OF METALS WITH OXYGEN

REACTIONS OF NON-METALS WITH OXYGEN

The general reaction of metals with oxygen

Reaction of iron with oxygen

Reaction of magnesium with oxygen

Formation of rust

Ways to prevent rusting

ACIDS AND BASES AND pH VALUE

REACTIONS OF ACIDS  WITH BASES: PART 1

REACTIONS OF ACIDS WITH BASES: PART 2

REACTIONS OF ACIDS WITH BASES: PART 3

REACTIONS OF ACIDS WITH METALS

Energy and Change - Term 3

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Planet Earth and Beyond - Term 4

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