Agriculture

4. The transfer of fertilised eggs from one female to another, such as from a rare species into a female of a closely related species that is more common.
8. An artificial form of asexual reproduction.
9. An organism that produces high-energy food substances using sunlight in photosynthesis.
10. The increase in concentration of a substance in living tissue as it is absorbed and stored faster than it is broken down and excreted.
11. These are heterotrophic animals that ingest and digest dead organic matter.
14. This is used to see if there is a significant difference between two means, where the data were measured, for example, mass, length and dissolved oxygen concentration.
15. The practise of growing a different crop in a field on a cycle of three, four or five years.
16. where the yield is achieved with low levels of inputs, often over a large area. Productivity is usually low (yield per unit area) but efficiency is usually high (yield per unit input).
17. The control of pests using living organisms, usually predators or pathogens.

1. This is used to see if there is a significant correlation between two variables.
2. A measure of the efficiency with which an organism converts its food into its own increasing biomass.
3. A crop that is grown around another crop to protect the neighbouring crop, usually by producing a scent that deters the pests.
5. They are not persistent but have high mammalian toxicity.
6. Material placed on the soil surface to reduce evaporation losses and reduce weed growth.
7. The artificial production of aquatic organisms, including fish farming.
12. The process by which nutrient levels in a water body increase to excessive levels such that the growth and subsequent die-off of plants and algae cause deoxygenation.
13. They have been linked with the deaths of bees, especially when they act synergistically with some fungicides.