Characteristics Of Life 2.0 Flashcards
What is biology?
The study of life
What is biological organisation?
The different levels of complexity in an organism.
What must something have to be considered alive?
- Biological organisation
- Nutrition
- Excretion
- Response
- Reproduce
What is a cell?
The most basic part of an organism
What is tissue?
A group of cells
What is an organ?
A group of tissues working together for a similar function
What is an organ system?
A group of organs working together for a similar function
What is an organism?
A group of organ systems working together for a similar function
What does multicellular mean?
Made up of many cells
Give an example of a multicellular organism.
Humans
What does unicellular mean?
Made up of one cell
Give an example of a unicellular organism.
Bacteria
What is nutrition?
The way in which an organism obtains and uses food.
What is an autotrophic organism?
An organism that makes its own food
What is a heterotrophic organism?
An organism that must obtain its food from another living thing
What is excretion?
The removal of waste products of metabolism from an organism
How do humans excrete?
•Breathing - CO2.
•Sweating - H2O+salt.
•Urinating - urea.
•Egestion - waste products from food.
How do plants excrete?
Release of O2 by photosynthesis.
What is metabolism?
The sum of all chemical reactions that occur in the cells of living organisms.
What is catabolism?
These reactions use energy to break down large molecules into smaller ones.
What is anabolism?
These reactions use energy to join small molecules together to form larger molecules.
What is a population?
A group of organisms of the same species.
What is response in biology?
The way in which living things react to their environment.
Give examples of response in plants.
•Light
•Gravity
