CELLS
(PLANT CELLS)
WHO CAN RECOGNIZE THIS?
AND WHAT IS IT USED FOR?
WHAT ABOUT THESE GOOD
PEOPLE?
CELLS
Cell is the smallest and basic
unit of life.
Remember…
• Prokaryote
– Simplest cells
– Single-celled
– Few, basic organelles
– DNA floating around,
uncontained
Free DNA strands
• Eukaryote
– Complex cells
– Single or multi-celled
– More organelles
– DNA contained within the
nucleus
Prokaryote or Eukaryote?
• Are animal and
plant cells
prokaryote cells
or eukaryote
cells?
• How do you
know?
Eukaryote!
• Plant and animals
cells are both
eukaryote cells,
because they are
multicellular and
contain many
organelles within
each cell, including a
nucleus where the
DNA is stored.
ORGANELLES
• An organelle is a subcellular
structure inside a cell that has one
or more specific jobs to perform.
parts of a plant cell/ cell
organelles
CELL ORGANELLES/
parts of a plant cell
• 1. CELL WALL: The outermost layer
of a cell found only in plant
cell, it gives support and
protection to the plant cell, but
does not control what enters or
leaves it
• (note: that fungi and bacteria
also have cell walls, but these
are not made of cellulose).
2. Cell membrane: a very thin layer
surrounding every cell which controls what
enters and leaves the cell.
in a plant cell, the cell membrane is pressed
tightly against the cell wall and so cannot be
seen as a separate structure
• 3. Cytoplasm: the material that fills a cell; it
is a gel made of many substances,
including proteins dissolved in water and
cell organelles, chemical reaction takes
place in it.
• 4. Nucleus: a structure found in most
cells, surrounded by a membrane, in
which chromosomes/DNA are found;
information held on the
chromosomes controls the activities
of the cell
• 5. Chloroplast: the structure found in
some plant cells which looks green
because it contains chlorophyll,
chloroplasts are the site for
photosynthesis
• 6. Mitochondrion (plural: mitochondria) : a
structure inside the cell where energy is
released, it is also referred to as powerhouse
of the cell.
7. large central food vacuole:
•
•
•
•
it is the main and biggest vacuole in plant cell
it may occupy more than 90% of the cell space
it helps in food storage
it contain large amount of liquid called cell sap
which is a solution of glucose
CLASS ACTIVITY
•ATTEMPT THE QUESTIONS ON
THE WORKSHEET YOU ARE
PROVIDED WITH?
class work
• the layer on the outside of a plant cell is called the cell
...............
• the thin layer between the cell wall and the cytoplasm is the
cell..........
• the clear jelly that fills most of a cell is called ...........
• the large space inside the cell is the ...............
• it contains .......................
• the round, dark structure inside the cytoplasm is the
.................
• the small oval structure inside the cytoplasm is the ...........
• the small oval structures inside the cytoplasm are ..........
• the cytoplasm also contains ....................
HOME WORK
• WORKBOOK PAGE 1 EXERCISE
1.1A.
• WORKBOOK PAGE 2 EXERCISE
1.1B.