Bio Pure And Simple Flashcards
What is cryptobiosis?
When certain organisms are frozen solid for ages and come alive as they thaw.
What is most life dependent on?
Water, oxygen, nutrients, and a source of heat and energy.
What is spontaneous generation?
If life could just occur from rotting things.
What are cells and how many are there in the human body?
- cells are the smallest units that can be thought of as alive.
- there are one trillion cells in the human body.
What are cells composed of?
Organelles
What are organelles?
The structures inside cells.
What is a tissue?
A group of cells similar in structure and function. Eg. Muscle tissue.
What is an organ?
A group of tissues acting together to form a complex function.
What is a system?
A group of organs acting together to perform a set of related functions.
What is an organism?
Many systems acting harmoniously.
What is a unicellular organism?
An organism that consists of just one cell.
What are unicellular animals called?
Protozoa.
What are multicellular organisms?
All organisms composed of more than one cell.
Give the function of the cell wall.
To prevent it from expanding too much and keeps its shape.
What processes do living organisms usually show?
- they move
- they grow
- they reproduce
- they excrete
- they can sense their environment
- they take in gasses
- they take in raw materials
