Download basically poor growing conditions

Growth Patterns
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
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
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
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
Annual Growth Rings
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
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
Regeneration in Mammals
Mammals have limited regenerative powers.
Regeneration only really occurs in the
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healing of wounds
mending of broken bones
replacement of blood after loss
regeneration of damaged liver
Animals – Liver Regeneration
 Greatest potential for regeneration
 Multiple functions so cells less differentiated
 Half a liver can regenerate to full size within 3
months
Animals – Skin regeneration
 Includes skin, hair
and nails
 Power to regenerate
decreases with age
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.
Limb Regeneration
A few animals are able to regenerate limbs
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Newts
Lizards
Hydra
Hydra budding