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Life Processes

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• Serious efforts to discover life on other planets have been going on for many years.

• If extra-terrestrial beings really were discovered how would scientists decide if they were alive?

A simple way of sorting everything on our planet is to divide it into 2 groups – living things and non-living things.

Signs of life

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Life ProcessesAll living things have to perform seven life processes. Do you know what they are?

Each letter in the phrase ‘MRS GREN’ gives you the first letter of one of the life processes.

Movement

Respiration

Sensitivity

Reproduction

Growth

Excretion

Nutrition

If something does not perform all of the seven life processes then it is not alive.

For something to be classed as Dead it must have been alive once !!

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The 7 Life ProcessesMovement

Respiration

Sensitivity

Reproduction

Growth

Excretion

Nutrition

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Exercise 1: Animal Movement

1. Why do animals move?

Type of movement

Example of animal

Walking

Crawling

Running

Flying

Swimming

Jumping

Swinging

Humans

Insect

Horse

Bird

Fish

Kangaroo

Chimpanzee

To find food, water, shelter, to hide from predators and to reproduce.

2. Copy and complete the table below:

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Plant Movement

1. Do plants move?•Yes, plants do move, but very slowly compared to most animals.

•Plants move towards sunlight which they need to make food.•Some flowers close during the night.•Roots will move towards water and gravity.

2. Why do plants move?

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Respiration•Respiration is the process by which energy is released from our food.•This energy is used for the organism to perform the other life processes.

•Most of our food is digested down to glucose.

•This joins with oxygen to release the energy and gives off the waste products carbon dioxide and water.

Glucose + Oxygen ENERGY + Carbon dioxide + Water

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Match the word to its correct meaning:

1 respiration 2 oxygen  3 carbon dioxide  4 water

5 energy

6 transport systems

A is a poisonous by-product of respiration. B take materials to and from respiring cells.

C is needed to release energy from glucose in the body.

D the process that releases energy from food.

E is made when energy is released from food.

F is needed to do the rest of MRSGREN.

D the process that releases energy from food.

C is needed to release energy from glucose in the body. 

A is a poisonous by-product of respiration. E is made when energy is released from food.

F is needed to do the rest of MRS GREN.

B take materials to and from respiring cells.

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Exercise 2: Respiration 1. Which gas is required for respiration?

2. What are the waste products of respiration?

3. Write a word equation for the process of respiration.

4. What is the chemical test for carbon dioxide gas?

Oxygen.

Water and Carbon dioxide.

Food + Oxygen Energy + Carbon dioxide + Water

It turns limewater milky (and then clear again).

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True or false?

1. Respiration means breathing.

2. Respiration occurs in all body cells.

3. Respiration gives out oxygen.

4. Carbon dioxide is used up by respiration.

5. Respiration is a chemical process that releases energy.

6. Plants do not respire.

FALSE

TRUE

FALSE

FALSE

TRUE

FALSE

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Living things ____________ to produce offspring.

Animals also _________ to catch food, to find a mate and

also to escape any predators.

As we get older, we ______ to reach our full size.

We use energy to do different things. Releasing energy

from food is called ____________ and eating the food we

require is called __________ .

Any waste produced is ________ from our bodies.

Living things must also react to what happens to them.

This is called _________ .

move reproduce sensitivity nutrition excreted

respiration grow

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SensitivitySensitivity is the ability of living things to detect changes in their surroundings and respond to these changes.

Humans have five senses; do you know what they are?

TouchTasteSmellSight

Hearing

SkinTongueNoseEyesEars

Which organs are associated with these

senses?

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Exercise 3: Sensitivity1. What is sensitivity?

2. Complete the table below:

3. Name two animals that can hear ultrasound.

Sense Body part

Sight

Ear

Taste

Nose

Touch

Eye

Hearing

Tongue

Smell

Skin

Being able to detect and respond to your surroundings.

Dogs and bats.

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Growth

Animals grow until they reach adulthood and then

stop growing.

Plants continue to grow throughout their lives.

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Animal ReproductionAll organisms need to reproduce. Reproduction is the making of new organisms. If organisms did not reproduce, then once those organisms died there would be no more of the species left.

Some animals reproduce by laying eggs.

Example: Birds

Some animals reproduce by giving birth to live young.

Example: Mammals

Adult and young kangaroo

Mammals suckle their young - the females provide milk for their offspring.

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Exercise 5: Link the Matching Pairs

Acorn

Cub

Calf

Baby

Pup

Lion

Seal

Oak tree

Human

Whale

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Plant ReproductionSome plants reproduce using the wind to carry pollen from one flower to another.

Some plants reproduce using insects or birds to carry pollen from one flower to another.

Why are insects attracted to flowers?

They are attracted by scent, colour and nectar.

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Excretion

Carbon dioxide is a waste product of respiration. What is the other waste product? HINT! Breathe on a mirror.

Excretion is the process where an organism gets rid of waste products that would otherwise cause it harm.

The waste products of respiration are carbon dioxide and water.

Breathe through a tube into a beaker of limewater. What

do you observe?

What happened to the limewater? It went milky.

What does this tell you?

There is more carbon dioxide in the air we breathe out than the air we breathe in.

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Exercise 6: Removing Waste

1. What do we call the process that remove waste products from an organism?

2. What are the waste products of respiration?

3. How do we remove carbon dioxide from our body?

4. What would happen if we did not remove this carbon dioxide?

Excretion.

Water and carbon dioxide.

We breathe it out.

It would poison our bodies and eventually kill us.

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Nutrition

CARNIVORES.

Animals eat food. Some animals eat other animals. What do we call these types of animals?

Nutrition is the obtaining of food to keep an organism healthy.

Some animals eat plants What do we call these animals?

HERBIVORES.

Animals that eat plants and animals are called OMNIVORES.

Green plants make their own food using sunlight, water and carbon dioxide. This process is called PHOTOSYNTHESIS.

A carnivore

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Exercise 7: Link the Word with the Description

Carnivore

Omnivore

Photosynthesis

Carbon dioxide

Herbivore

Plant-eating animals

Meat-eating animals

The gas needed by green plants to make food

Animals that eat meat and plants

The process by which green plants make food using sunlight

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Exercise 8: Insert the Key Words

Animals must eat food to gain nutrition. Animals that eat plants are called _________. Animals that eat ____ are called carnivores. Animals that eat meat and plants are called _________.

Green plants gain nutrition by making their own food using _______, water and oxygen. This process is called _____________.

meat omnivores photosynthesis

herbivores sunlight

herbivoresmeat

omnivores

sunlightphotosynthesis