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Growth Patterns

Growth Patterns

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Growth Patterns

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  1. Growth Patterns

  2. Learning intentions • I can explain that growth is an increase in mass • I can state several ways as to how growth can be measured (fresh weight, dry weight, height and increase in cell number. • I can recognise the growth pattern of different organisms. • I can give explanation of reason for the shape of typical growth patterns • I can compare the differences between how plant and animals grow

  3. Success Criteria By the end of the activity: • I can state that growth is an increase in mass • I can state that growth can be measured by dry weight, fresh weight, height or increase in cell number • I can describe or draw the typical growth pattern of a tree, human, insect and annual plant • I can complete a table to compare and contrast where and how plants and animals grow

  4. What is growth? • Growth is an irreversible increase in mass of an organism (usually involves an increase in cell number). • Water content can vary a lot in an organism so we often use dry mass to measure growth. • Growth involves the uptake of chemicals and synthesis of new structures. • Growth can also be measured by height and cell number

  5. How do animal and plants grow? Plants and Animals use different mechanisms for growth. • In a developing animals growth occurs all over the body. • In plants growth occurs in regions in the root and shoot tip and in areas of the stem only

  6. Annual Growth Rings

  7. The Thickness of Annual Rings • The growing conditions of a year can be determined by Annual Ring Thickness. • Wide Ring – a year of mild temperatures, with plenty of sunshine and rainfall – good growing conditions. • Narrow Ring – cold weather, drought, or maybe disease / insect infestation – basically poor growing conditions

  8. Regeneration in Plants Regeneration is the process by which an organism replaces lost or damaged parts. • Flowering plants are good at regeneration • A piece of root or stem can regenerate a entire plant

  9. Regeneration in Mammals Mammals have limited regenerative powers. Regeneration only really occurs in the • healing of wounds • mending of broken bones • replacement of blood after loss • regeneration of damaged liver

  10. Animals – Liver Regeneration • Greatest potential for regeneration • Multiple functions so cells less differentiated • Half a liver can regenerate to full size within 3 months

  11. Animals – Skin regeneration • Includes skin, hair and nails • Power to regenerate decreases with age

  12. Animals – Heart and Neuron regeneration • Incapable of regeneration • All brain cells are developed at birth • Many will increase in size and may also gain in function • Cells are dying all the time.

  13. Limb Regeneration A few animals are able to regenerate limbs • Newts • Lizards • Hydra

  14. Hydra budding