11956855
Description
Flashcards by J yadonknow, updated more than 1 year ago
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Created by J yadonknow
over 6 years ago
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| Question | Answer |
| What are the different application methods of pesticides? (6) | Direct - spray 2' contact - spray crop, touch May have to be ingested, systematic in soil and taken up by roots Repellent Fumigant Lure and Kill |
| DDT and peregrine falcons | Thin egg shells, high residues of DDE (metabolites of DDT). |
| What are organochlorines? | e.g. DDT Broad-spectrum toxins Remain in environment for a long time |
| What are chlorophenoxy? | Herbicides e.g. 2,4-D Resembles auxins Breaks down in soil quickly |
| What are organophosphates? | e.g. Parathion Highly toxic to humans Readily broken down |
| What is biomagnification? | Pesticide ppm increases as you go up trophic levels Occurs when CF>1 |
| How do you calculate the concentration factor? | CF=[Pollutant]consumer/[Pollutant] diet |
| What types of microplastics exist? | 1' - direct human manufacture and use 2'-fragments derived from breakdown of larger plastics |
| What is the current extinction period? | Holocene/sixth extinction era |
| What are the causes of this extinction event? | Habitat fragmentation Human over-population |
| Define biodiversity | Variability among living organisms from all sources Diversity within, between species and of ecosystems. |
| How do you define genetic diversity? | Range of genetic variations within a species |
| How do you define Genetic Variability? | Tendency of genetic characteristics to vary |
| What is species diversity measuring? | Richness= number of species evenness= how equal the abundances of species are |
| Show simpson's diversity index | N=Total amount of organisms n=Total from species of interest |
| What are the different levels of biodiversity? | gamma = diversity of whole study, total species density alpha = Diversity of species within each unit of that landscape Beta = Diversity between individuals of the same habitat |
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