Module 2: Multicellular Organisms Flashcards
What is a colonial organism?
When thousands of unicellular amoebas congregate together to form a larger “organism”. However each individual cell is its own separate organism.
Provide two examples of colonial organisms.
Slime moulds and blue bottle jellyfish.
What is the name for the different animals within a colonial organism?
Zooids.
What is the role of dactylozooids in blue bottles?
A trailing tentacle that has specialised stinging cells to assist in trapping prey.
What is the role of gonozooids in blue bottles?
Each one consists of male and female reproductive bodies.
What is the role of gastrozooids in blue bottles?
Zooids that attatch to prey and secrete various digestive enzymes.
What is the role of pneumatphores in blue bottles?
An air-filled bladder that helps the blue bottle float.
Why are uniellular organisms so small in size?
Because they require a large SA:V ratio to diffuse all the substances they need to survive. If they were larger, they wouldn’t be able to diffue all the nutrients they need fast enough.
What is a tissue?
A group of specialised cells working together.
What is an organ?
A group of tissues working together to perform a function for an organism.
What is a system?
Groups of organs working together to perform a function for an organism, such as circulation.
What is an organism?
A living thing made of one or more cells.
What is the role of skin?
A protective layer for our bodies.
What is the largest organ in the human body?
The skin.
How is cell death used beneficially in epidermis tissue?
the dead cells form a thin, scaly mesh that is waterproof. This acts as a barrier to microbes entering the body.
