biology-differentiation and growth

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what is differentiation?
cells become different shapes and sizes to carry out specialised jobs.
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describe animals patterns of growth and development
all regions of the body grow.Tend to grow to a certain size and then stop growing. Usually have a compact growth form.New cells can be made by most tissues.Size increase brought about increasing cell numbers.
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describe cell specialisation in animals
only stem cells can differentiate into different cell types.Other animal cell functions remain fixed.
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describe plants patterns of growth and development
growth restricted to special growing points called meristems-main ones r at tips of roots and shoots.Usually grow throughout life.Usually have a spreading,branched growth form.size increase caused by increasing size of cells by absorbing water into v
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describe cell specialisation in plants
most plant cells can differentiate into different cell types.
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for animals the pattern of growth is well suited to their life,as follows..
a-greater variety of organs+tissues than plants.Growing all over ensures all of these organs grow in conjunction with each other.Growing for a time+stopping allows a to use energy for movement etc.
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for plants the pattern of growth is well suited to their life,as follows..
main needs for plant are light+water-growing at tip of shoot+root allow plant to grow up towards light+down to soil.spreading body form of plants allow greater surface area for absorbing light.parts of plant eaten by animals-growing in life allows pl
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where are stem cells found?
animals+plants:embryos,in certain adult tissues e.g. bone marrow and in growing points of plants.
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what is a stem cell?
A cell which can differentiate into other types of cell
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explain the use of human stem cells
can be used to replace damaged cells,embryonic stem cells-greater powers of differentiation.
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why is the use of embryonic stem cells opposed by some people?
bc the embryo is destroyed in the process. The embryos used are grown in the laboratory and are not the result of natural conception so others feel that their use is justified.
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describe animals patterns of growth and development

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all regions of the body grow.Tend to grow to a certain size and then stop growing. Usually have a compact growth form.New cells can be made by most tissues.Size increase brought about increasing cell numbers.

Card 3

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describe cell specialisation in animals

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Card 4

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describe plants patterns of growth and development

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Card 5

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describe cell specialisation in plants

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