Download Unit 2 Topic 4 Biodiversity and Natural Resources

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Unit 2 Topic 4: Biodiversity and natural resources
Revision questions
Define the term(s):
1. Biodiversity and Endemism
Identify:
1. The differences and similarities between the organelles in animal and plant
cells
2. The ultrastructures of a plant cell, including the cell wall, chloroplasts,
amyloplasts, vacuole, tonoplast, plasmodesmata, pits and middle lamella
3. The differences and similarities between the structure and function of the
polysaccharides starch and cellulose, including the role of hydrogen bonds
between ß-glucose molecules in the formation of cellulose microfibrils.
4. Sclerenchyma fibres and xylem vessels as seen through a light microscope
and the position they have in the stem
5. The differences and similarities between historic drug testing and
contemporary drug testing protocols, eg William Withering’s digitalis soup;
double blind trials; placebo; three phase testing.
Describe:
1. The function of sclerenchyma fibres (support) and xylem vessels (support and
transport of water and mineral ions)
2. How biodiversity can be measured within a habitat using species richness
3. How biodiversity can be measured within a species using genetic diversity (eg
variety of alleles in a gene pool)
4. The concept of niche
5. How natural selection can lead to adaptation and evolution
Explain:
1. How the arrangement of cellulose microfibrils in plant cell walls and
secondary thickening contribute to the physical properties of plant fibres,
which can be exploited by humans.
2. The importance of water and inorganic ions (nitrate, calcium ions and
magnesium ions) to plants.
Discuss:
1. How the uses of plant fibres and starch contribute to sustainability, eg plantbased products to replace oil-based plastics.
2. Specific examples of adaptations of organisms to their environment
(behavioural, physiological and anatomical).
3. The process and importance of critical evaluation of new data by scientific
community, which leads to new taxonomic groupings (ie three domains based
on molecular phylogeny).
4. AND evaluate the methods used by zoos and seedbanks in the conservation of
endangered species and their genetic diversity (eg scientific research, captive
breeding programmes, reintroduction programmes and education).