TO EVS CLASS

CLASS VEVS

presented by:-

Virender Singh VermaVirender Singh Verma

Our Sensesand our

environment

The 7 characteristics of Living ThingsMovement – Animals move to find food and keep

away from predators, plants move to face the lightReproduction – the ability to produce offspring to

keep the species in existenceSensitivity – responding and reacting to the

environmentNutrition – Animals need food for respiration, plants

need minerals from the soilExcretion – Getting rid of wasteRespiration – Turning food into energyGrowth – Growing larger and stronger becoming

adult size

Sensitivity – responding and reacting to the change in environment is called stimulus.Change in environment is called stimuli

- One of the common characteristic is that living things can detect stimuli and react to them.

- To do this, living things must be able to detect changes in the environment or stimuli

What are the senseorgans that detectdifferent stimuli?

(Sight)(Hearing)

(Taste)

(Smell)

(Touch)

5 sense organs in humans

Eye

Tongue

Ear

Skin

Nose

Which sense organ helps Mrs Wong to hear the

phone call?

Why can Lily detect the burning smell?

Which sense organ does Jimmy use to

detect the taste of the banana?

How Grandfather knows the tea is

hot?

Look at the following diagram and see how important our senses are.

1 Helps us avoid danger.E.g. Lily can smell smoke from a fire.Grandfather can sense that the tea

is hot.

Importance of sensing the environment

2 Helps us detect messages and communicate.

E.g. Mrs Singh can hear people talk.

3 Offers us feelings.E.g. Julie can taste and smell the food and watch TV.

Mr. Singh can see obstacles in frontof him.

For other animals, sense organshelp them avoid danger,find food and shelters...

- Each kind of sense organ has its own sensory cells Different kinds of sensory cells detect different kinds of stimuli.

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detects sound

Eardetects light

Eye

detects taste

tonguedetects temperature,touch, pressure andpain

Skindetects smell

Nose

- When a sense organ detects a stimulus, a message will be sent to the brain.

- The brain interprets and analyzes the message and a sense will be produced.

Special methods used by other animals to sense the environment

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How do other animals like snakes, honey bees, mosquitoes and fish sense the environment?

Find this out from the library or the internet.

How would you distinguish between the following pairs of objects?

Check-point 1 p.67

1 Soy sauce and vinegar

Eye

Ear

Tongue

Nose

Skin

Eye

Ear

Tongue

Nose

Skin

2 Flute and tambourine

Eye

Ear

Tongue

Nose

Skin

3 Iced lemon tea and hot lemon tea

4 Rs 5 coin and Rs.2 coinEye

Ear

Tongue

Nose

Skin

5 Grey sock and white sock

Eye

Ear

Tongue

Nose

Skin