Cells, tissues, organs, organ systems and organisms

Question 1

What is the definition of a cell?

Answer 1

The smallest unit of an organism
Example in plants: palisade cell
Example in animals: glandular cells

Question 2

What is the definition of a tissue?

Answer 2

A group of cells with a similar structure and function, which all work together to do a particular job.
Example in plants: leaf epithelium
Example in animals: stomach lining

Question 3

What is the definition of an organ?

Answer 3

Made from a group of different tissues, which all work together to do a particular job.
Example in plants: leaves
In animals: stomach

Question 4

What is the definition of an organ system?

Answer 4

Made from a group of different organs, which all work together to do a particular job.
Example in plants: photosynthetic system
In animals: digestive system

Question 5

What is the definition of an organism?

Answer 5

An individual plant, animal, or single-celled organism.
Example in plants: daffodil
In animals: lion