unit 2, plants as natural resources, species and evolution, the importance of biodiversity

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detailled revision notes on the 'plant' side of biology Unit 2 edexcel 

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Chapter 4.2 Plants as natural resources
I can describe how the uses of plant fibres and starch may contribute to sustainability, e.g. Plant-based products to
replace oil-based plastics:
Sustainability ­ using resources in a way that meets the needs of the current generation without having particularly
damaging consequences on future…

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6. Throughout the experiment all other variables, like temperature and humidity, must be kept constant
7. Take safety measures ­ wear goggles to protect eyes, leave the area where weights are being attached
clear so they will fall safely and don't hurt your toes.

I can compare historic drug testing…

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Sterile forceps
Marker pen
Incubator set at 25 C
1. Agar plates seeded with the suitable bacteria will have been prepared for you, now you need to collect these
disks and return it to an appropriate, sterile area.
2. Obtain a mint leaf by crushing 3g of plant…

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Taxonomy is the science of classification. It involves naming organisms and organising them into groups based
on their similarities and differences. This makes it easier for scientists to identify them and to study them.
1. There are 7 levels of groups (called taxonomic groups) used in classification
2. Similar organisms…

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New data has to be evaluated by other scientists to check if it's actually there. If all scientists agree it can lead
to a new organism being reclassified or leads to changes in the classification system structure
Tentative nature has been portrayed in this way
Three domains vs Five Kingdoms…

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3. Anatomical adaptions ­ structural features of an organism's body that increase its chance of
survival. For example: Pipistrelle bats have light, flexible wings that allow them to hunt fast-flying insects.

I can describe how natural selection can lead to adaption and evolution:
Alleles in a population will be affected…

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Species diversity ­ the number of different species and the abundance of each species in an area. For
example, a wood could contain many different species of plant, insects, birds and mammals
Genetic diversity ­ the variation of alleles within a species (or a population of a species). For example,…

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The larger the number of different phenotypes, the You can measure the number of different alleles a
greater the genetic diversity species has for one characteristic to see how genetically
diverse the species is.
For example, humans have different eye colours due to The larger the number of different alleles,…

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2. Reintroduced animals may not behave as they would if they'd been raised in the wild. E.g. they may have
problems finding food or communicating with wild members of their species
Seedbanks and zoos contribute to scientific research
Seedbanks Zoos
Scientists can study how plant species can be Research in…




Amazing stuff,thanks loads. **

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