Everything on the Biology OCR up until Cellular Control topic
| Text | The cohesion-tension theory explains how water moves up the xylem due to {{c1::cohesion between water molecules}} and tension. |
| Back Extra | Adhesion to xylem walls also helps. |
| Text | Chloride ions (Cl⁻) are involved in maintaining {{c1::water balance}} and forming hydrochloric acid in the stomach. |
| Back Extra | Help regulate osmotic pressure. |
| Text | Direct transmission involves physical contact, inoculation, or ingestion. |
| Back Extra | Examples: touching, kissing, sharing needles. |