B2 Biology Part 3

Cells

Cells do particular jobs. For example, a hair cell in plant roots absorb mineral salt by active transport. This means that the mineral salts are diffused into the root cells by movement of molecules by respiration. The membrane contains molecular pumps which pump the minerals from low concentration to the cell with high concentration. This allows the roots to absorb and concentrate minerals more efficiently.

Intensive farming

ActionTreatmentExplanationSide effect Remove competing plants from the crop growing area Herbicide spray Allows more energy to be transferred to the crop Reduces biodiversity. May have harmful effect on health. Remove animals that feed on the crop Pesticide spray Prevents energy being transferred from the crop to consumers Reduces biodiversity. May poison helpful organisms. Keep animals indoors ‘Battery’…