TO EVS CLASS

CLASS VEVS

presented by:-

Virender Singh VermaVirender Singh Verma

Our Sensesand our

environment

The 7 characteristics of Living Things

Movement – Animals move to find food and keep away from predators, plants move to face the light

Reproduction – the ability to produce offspring to keep the species in existence

Sensitivity – responding and reacting to the environment

Nutrition – Animals need food for respiration, plants need minerals from the soil

Excretion – Getting rid of waste

Respiration – Turning food into energy

Growth – 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 humans5 sense organs in humans

EyeEye

TongueTongue

EarEar

SkinSkin

NoseNose

Which sense organ helps Mrs Wong to hear the

phone call?

Which sense organ helps Mrs Wong to hear the

phone call?

Why can Lily detect the burning smell?

Why can Lily detect the burning smell?

Which sense organ does Jimmy use to

detect the taste of the banana?

Which sense organ does Jimmy use to

detect the taste of the banana?

How Grandfather knows the tea is

hot?

How Grandfather knows the tea is

hot?

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

Importance of sensing the environmentImportance 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 organs

help 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

EarEar

detects light

EyeEye

detects taste

tonguetonguedetects temperature,touch, pressure andpain

SkinSkin

detects smell

NoseNose

- 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

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.

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

EyeEye

EarEar

TongueTongue

NoseNose

SkinSkin

EyeEye

EarEar

TongueTongue

NoseNose

SkinSkin

2 Flute and tambourine

EyeEye

EarEar

TongueTongue

NoseNose

SkinSkin

3 Iced lemon tea and hot lemon tea

4 Rs 5 coin and Rs.2 coinEyeEye

EarEar

TongueTongue

NoseNose

SkinSkin

5 Grey sock and white sock

EyeEye

EarEar

TongueTongue

NoseNose

SkinSkin