Grade 10 Life Sciences Term 3 Notes: Comprehensive Study Guide
Dive into the third term’s curriculum with these detailed and well-organized Life Sciences notes, covering:
Key Topics
Movement Across Membranes: Diffusion, osmosis, and active transport explained.
Cell Division: Detailed sta...
Cell membranes are selectively permeable meaning that they allow certain substances to pass through
& prevent other substances from entering. Membranes are 1 cell thick
Molecules enter or leave the cell through: Osmosis; Diffusion; Active Transport
● Diffusion- Movement of molecules from an area of high
concentration to low concentration until concentration is
equal on both sides
● Osmosis- Movement of water molecules from an area of
high water potential to an area of low water potential
across a semipermeable membrane. Cell membranes do
not allow dissolved substances. Eg. sugar to pass through
● Active Transport- Transport of molecules against a concentration gradient,
which therefore requires energy. Some organic molecules eg. amino acids &
glucose are too large to fit through the membrane. Protein in the membrane
will gain energy from the mitochondria to move these molecules through the
membrane
Topic 2: Cell Division
Cell Cycle
A series of processes that take place in a cell between 1 cell division & the next
● During the cell cycle, cells grow & prepare for cell division & after cell division, the new cell
grows and the cycle carries on
● The cell cycle has 4 main stages
○ Growth of cell & production of new materials
○ Replication of DNA & duplication of chromosomes
○ Final growth & preparations for cell division
○ Mitosis & Cytokinesis
Interphase- The period between cell divisions during which the cell grows & prepares to divide
(preparation for mitosis)
● During the first parts of interphase, Cells are active & continue regular activities
● Nerve cells & blood cells DO NOT go through mitosis
Chromosomes
Are found in the cell nucleus & contains info that controls cell processes
● Structure- When not undergoing division, chromosomes form a tangled ball
called the chromatin network. But during interphase, The chromosomes
untangle and replicate themselves. Chromosomes are made up of DNA & protein
Mitosis
Process where 1 cell divides to form 2 identical cells
● Identical cells have the same number & type of chromosomes
● Meiosis is the cell division process that halves the chromosome number to produce
reproductive cells, such as sperm and eggs.
○ Zygote- result of the sperm & egg fusing. It undergoes
mitosis for several weeks to form an embryo which
will grow into a foetus thru mitosis
○ Meiosis produces sperm cells & egg cells
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller mahmudsherbhai1503. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R100,00. You're not tied to anything after your purchase.
