Download N5- Unit 2 MO1-Cells, tissues, organs, stem cells and meristems 1

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Transcript
N5- Unit 2
MO1-Cells, tissues, organs, stem cells and meristems
1.Describe specialisation in cells A process whereby cells have changed their shape or
metabolism to carry out a particular function (i.e. job).
2.Summary of the body
Specialised cells tissues organs  systems
organisation
3. What is a tissue?
A group of cells of the same type.
4. What is an organ?
Different tissues working together to do a job.
5. Examples of systems
Circulatory, respiratory, reproductive etc…
6. For the following cells, state the type of cell, its function and adaptations
Type of cell: Root hair cell
Function: Absorbs water and mineral from the soil
Adaptations: Long 'finger-like' extension with very thin
wall, which gives a large surface area.
Type of cell: Palisade cell
Function: Site of photosynthesis
Adaptations: Contains lots of chloroplasts
Type of cell: Sperm cell
Function: reproduction/ fertilization of the egg
Adaptations: has a tail to swim and many mitochondria to
release energy.
Type of cell: Egg cell
Function: Reproduction/being fertilized by the sperm cell.
Adaptations: large cell containing food reserves.
Type of cell: Red blood cell
Function: carry oxygen
Adaptations: contains haemoglobin to carry oxygen, large
surface area to allow diffusion, flexible to go through
capillaries.
7.What are stem cells?
8. What can happen to a stem
cell went it divides?
9. What are stems cells needed
for?
10. Give examples of the use of
stem cells in medicine
11. What are meristems?
12. What are the two types of
meristems, where are they
found, what is their job?
13. Give 3 examples of plant
tissues formed after cells
specialise.
Cells which give rise to specialised cells.
It can either produce more stem cells or produce a
different type of cell.
Growth and repair.
- treat burns
- diabetes
The region of a plant where cells divide.
Apical meristems: in buds and at the tip of roots. They are
responsible for growth in length.
Lateral meristems: inside shoots and roots of woody
plants, forming a ring. They are responsible for growth in
girth.
- Xylem
- Phloem
- Epidermis