Multi Cellular Flashcards
Definition of a food chain
The sequence of how animals gain their food.
Definition of the arrows in a food chain/web
Energy flow
Definition of a food web
Interlinking food chain
Definition of a herbivore
Animal that feeds only on plants
Examples of a herbivore
Deers, cows, horses (most farm animals)
Definition of an omnivore
Animal that eats a variety of foods
Examples of an omnivore
Monkeys, bears, birds and humans
Definition of a carnivore
Animal that feeds on other animals
Example of a carnivore
Lions, tigers, sharks and foxes
Why are two eyes needed to judge distance
The image formed in the left eye is slightly different to the image formed in the right eye and the brain puts them together to form a 3D image.
What is the pupil
A hole in the middle of the iris
What does the pupil do
Lets light into the back of the eye
What is the cornea
A transparent layer that is at the front of the eye
What does the cornea do
Allows light to enter and begins to bring it into focus
What is the iris
Coloured part of the eye
What does the iris do
Controls the amount of light entering the eye
What is the lens
Flexible biconvex structure behind the iris
What does the lens do
Focuses light on the retina
What is the retina
Light sensitive area containing receptors
What does the retina do
Converts light into electrical impulses
What is the blind spot
Point where receptors are absent and fibres from retina enter the optic nerve
Give two functions of the ear
Hearing and balance
What does the optic nerve do
Carries nerve impulses from the retina to the brain
What is the auditory canal
An air filled tube, the bit earwax is in
What does the auditory canal do
Directs sound waves to eardrum
What is the eardrum
Thin membrane stretched completely across the auditory canal
What does the eardrum do
Vibrates with sound waves which it passes on to the middle ear bone
What is the middle ear bones
Bone behind ear drum
What does the middle ear bones do
Amplify and transmit sound vibrations from ear drum to oval window
What is the oval window
Thin membrane behind ear drum
What does the oval window do
Transmits sound vibrations into liquid filled inner ear
