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

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

  • 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


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


Cilia and Flagella


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


Growth and reproduction

  • Watch the video clip Mitosis

  • Look out for the terms

  • 1. Diploid-

  • 2. Haploid-


Germination –growth of a seed

  • Watch the video clip on Growth


Growing plants

  • In order to reproduce, flowering plants produce seeds.

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


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

  • 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?


GERMINATION

The development of a plant embryo into an independent plant


First green leaves

Young shoot

Soil level

Young root

Root hair

Side roots


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


1

2

3

4

control

WATER

WATER

WARMTH

WATER

WARMTH

OXYGEN

OXYGEN

WARMTH

NO OXYGEN

NO WARMTH

NO WATER

OXYGEN


1

2

3

4

control

WATER

WATER

WARMTH

WATER

WARMTH

OXYGEN

OXYGEN

WARMTH

NO OXYGEN

NO WARMTH

NO WATER

OXYGEN


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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