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Grade 9 Natural Science Guide
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it covers term 1 to 4 and has activities to practice on with answers to some of the questions and provides easy to understand summaries of the different aspects and concepts
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,Day 1Topic 1.1: Cells as the basic units of life
✔ Let's learn Terminology!
Cell: The smallest basic structural unit of life.
Microscopic: Something so small that it can only be seen under a
microscope.
✔ Let's Read!
Read through page 8 in your textbook.
✔ Let's sum it up!
Cells are the tiny building blocks that make up your body and the bodies of
other living organisms, and they work together to make our bodies function.
Most cells are microscopic, meaning that they are so small that they can only
be seen under a microscope.
Cells are classified as the smallest structural unit of life because they are the
smallest organism that carries out the seven life functions:
Teacher Tip!
You can easily remember the seven life functions by remembering
MRS GREN:
2
, ✔ Did you understand the work?
Complete the following exercise in your workbook.
1. In your own words, explain why cells are considered the smallest structural
units of life. (2)
2. Provide a brief description for each of the SEVEN life functions. (7)
[9]
Day 2
Topic 1.2 Cell Structures
✔ Let's learn Terminology!
Organelle: The small structures inside a cell that perform various functions.
DNA: The genetic information used to build a new organism.
✔ Let's Read!
Read through pages 8 & 9 in your textbook.
✔ Let's sum it up!
Cells are classified in TWO groups: - Plant cells
- Animal cells
Each cell is made up of different structures called organelles. Plant and
animal cells have the following components in common:
• Cell membrane: The thin layer around the cell that encloses the
contents of the cell. It also controls what enters and exits the cell,
allowing nutrients to enter and waste to exit.
• Cytoplasm: The jelly-like liquid that fills the inside of the cell and
contains the organelles. The cytoplasm supports organelles in the cell,
and is where chemical reactions take place.
3
, • Nucleus: The nucleus controls all processes that happen in a cell. The
nucleus contains DNA which contains an organism's genes. Genes
carry the inherited characteristics which you get from your parents.
Teacher Tip!
Use this diagram when drawing your own cell:
✔ Did you understand the work?
Complete the following exercise in your workbook.
1. Copy the following sentences into your workbook and fill in the missing
words:
1.1. Organisms are built of building blocks called __________. (1)
1.2. The __________ in a cell contains cell sap. (1)
1.3. The ___________ controls what goes into and out of a cell. (1)
1.4. The DNA in a plant or animal cell is found in the ___________ of the cell
and is responsible for _______________. (2)
[5]
4
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