Stimulus
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Stimulus. A stimulus is anything that can trigger a physical or behavioural change. The plural of stimulus is stimuli. Examples of stimuli include irritants, sights, sounds, heat, cold, smells, or other sensations. Life processes . M- movement - response to stimuli

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Stimulus

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Stimulus

Stimulus

A stimulus is anything that can trigger a physical or behavioural change. The plural of stimulus is stimuli.

Examples of stimuli include irritants, sights, sounds, heat, cold, smells, or other sensations.


Life processes

Life processes

  • M- movement - response to stimuli

  • R- Reproduction - Mitosis and Meiosis

  • S- Sensitivity – response to stimuli

  • N- Nutrition – response to stimuli /movement

  • E- Excretion

  • R- Respiration

  • G- Growth – Mitosis and Meiosis


Stimulus

Survival of an organism depends on its ability to respond to a stimulus whether it’s a plant or an a animal


Movement in unicellular organisms

Movement in Unicellular organisms


Cilia and flagella

Cilia and Flagella


Why is it important for organisms to be able to respond to a stimulus

Why is it important for organisms tobe able to respond to a stimulus ?

What type of stimulus might they respond to and why ?

1. Heat

2.pH

3.light

4.Moisture


Tactile response

Tactile response


Growth and reproduction

Growth and reproduction

  • Watch the video clip Mitosis

  • Look out for the terms

  • 1. Diploid-

  • 2. Haploid-


Germination growth of a seed

Germination –growth of a seed

  • Watch the video clip on Growth


Growing plants

Growing plants

  • In order to reproduce, flowering plants produce seeds.

  • All seeds contain an embryo and a food store containing starch.


Stimulus

Embryo plant which grows into bean plant

Protects internal structure

Seed coat

Young shoot

Young root

Seed coat

Removed and seed opened out

2 Seed leaves (cotyledons)

Food store full of starchy food


Copy table and fill in missing answers

Copy table and fill in missing answers

  • Answer the following questions in sentences!

  • What kind of food is stored in a seed?

  • What happens to the food stored in the seed leaves (cotyledons) when germination starts?


Stimulus

GERMINATION

The development of a plant embryo into an independent plant


Stimulus

First green leaves

Young shoot

Soil level

Young root

Root hair

Side roots


Stimulus

The Golden rules of experimental design

At each stage only ___ ______ _____ is studied at a time because if several are involved then it is impossible to know which is responsible for the results

one variable factor

____ _________ are used because if only a few are used then perhaps these were unusual and not typical of the species in general

Many organisms

This experiment should be repeated ____ _____ because if not then perhaps the outcome just happened to result from a lucky chance

many times


Stimulus

1

2

3

4

control

WATER

WATER

WARMTH

WATER

WARMTH

OXYGEN

OXYGEN

WARMTH

NO OXYGEN

NO WARMTH

NO WATER

OXYGEN


Stimulus

1

2

3

4

control

WATER

WATER

WARMTH

WATER

WARMTH

OXYGEN

OXYGEN

WARMTH

NO OXYGEN

NO WARMTH

NO WATER

OXYGEN


Stimulus

Seeds need _____, ______ and ______ for germination.

______ is needed for respiration to give ______ for growth.

_____ is needed to allow ________ to digest stored food for the growing embryo

______ is needed to give a suitable ___________ for enzymes to act.

water

warmth

oxygen

Oxygen

energy

Water

enzymes

Warmth

temperature


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