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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 . M- movement - response to stimuli

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Stimulus

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  1. 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.

  2. 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

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

  4. Movement in Unicellular organisms

  5. Cilia and Flagella

  6. 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

  7. Tactile response

  8. Growth and reproduction • Watch the video clip Mitosis • Look out for the terms • 1. Diploid- • 2. Haploid-

  9. Germination –growth of a seed • Watch the video clip on Growth

  10. Growing plants • In order to reproduce, flowering plants produce seeds. • All seeds contain an embryo and a food store containing starch.

  11. 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

  12. 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?

  13. GERMINATION The development of a plant embryo into an independent plant

  14. First green leaves Young shoot Soil level Young root Root hair Side roots

  15. 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

  16. 1 2 3 4 control WATER WATER WARMTH WATER WARMTH OXYGEN OXYGEN WARMTH NO OXYGEN NO WARMTH NO WATER OXYGEN

  17. 1 2 3 4 control WATER WATER WARMTH WATER WARMTH OXYGEN OXYGEN WARMTH NO OXYGEN NO WARMTH NO WATER OXYGEN

  18. 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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