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Plant response to stimuli slower and lesser than animal
Plant response to light, water, touch and gravity
The response is called tropism

Tropism:
Phototropism
Hydrotopism
Geotropism

Plant shoots:
Phototropism positive
Geotropism negative

Plant roots:
Geotropism and hydrotopism positive
Phototropism negative

Thigmotropism is response when plant is touch

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Sound is produced by vibration
Sound can only travel through air, water and solids
Sound is reflected when obstructed by a rough surface
Sound reflection is known as echo
Common causes of deafness is damage caused to part of the ears
Mild deafness can be overcome by using hearing aids
Stereophonic hearing is the ability to hear by both ears

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Light are waves that travel in straight lines

Reflection of Light
reflection is light that reflected

Law of reflection
The angle of incidence is equal to angle of reflection

Light will be absorb if the surface is opague

Refraction of Light
Bending of a light ray when it enters medium with different density

Blurred vision, blindness and colour blindness are common vision defects

Example of blurred vision is short and long sightedness and astigmatism

Optical illusion, the blind spot, stereoscopic and monocular vision is example of limitaions of sight

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Eyes are the sensory organ

Eyes str ucture

Parts and Functions

-sclera - form a protective layer
-choroid - the black middle layer is pigmented to supply food and oxygen
-cornea - allows light to enter
-conjunctiva -protects the front part of the eye
-aqueous and vitreous humor - mantain the shape of the eye
-pupil -controls the light that enters the eye
-lens - bend and focus the light on retina
-suspensory ligaments - hold the lens
-iris - controls the opening of pupil
-ciliary muscles - control the thickness of lens
- retina -send information in form of nerve
-optic - send nervous impulse

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Ear is the sensory organ

Ear can be sectioned into three which is outer, middle, inner

Parts and Functions

Pinna - collect sound waves and directs them into auditory canal

Auditory canal - send sound waves to ear drum

Ear drum - vibrates as the same sound frequency and transfers them to the ossicles

Ossicles - magnifies the vibrations and send them to the oval window

Eustachian tubes - balanced the air pressure inside and outside the ear drum

Oval window - transfer the vibration to the cochlea

Cochlea - converts vibrations to the nerve impulses

Auditory nerve - send the nerve impulses to brain to be interpreted as sound

Semicircular canals - help body maintance its balance

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Tongue is the sensory organ

Has taste receptors

Detect sweet, sour, bitter, salty

Receptors located in taste buds

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Nose recognises smell

Nose sensitivity is reliant on the mucus quantity

The fine hair is a trap to prevent dust and dirt

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Can sense cold, heat, pain, touch and pressure

Different parts of body have different degrees of sensitivity

A thin layer of skin has more receptors

Other functions:

-protect body from physical injury

-maintain body temperature

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Detect stimulus

Skin, nose, tounge, ears,eyes

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The World Through Our Senses