The diagram shows an external view of the human heart. Which of the following statements about the artery shown on the diagram is/are correct?1 It is the site of diffusion…

Disproportionation is the simultaneous oxidation and reduction of the same species in areaction.In which of the following chemical equations does disproportionation occur?1 Fe + CuCl2 → FeCl2 + Cu2 Cu…

Dolly the sheep was born in 1996. She was unusual because she had no biological father. Sheep have a diploid number of 54 chromosomes in their body cells. The diagram…

In triangle PRS, line QT is parallel to side RS.RS = 1.5 cmTS = 1.8 cmQT = 0.3 cmWhat is the length of PS? Answer: 12) F To solve this…

A piece of magnesium ribbon is dropped into a beaker of dilute aqueous hydrochloric acid at room temperature. After a while the production of bubbles of gas slows down. Which…

The diagram shows four experiments used to investigate movement of substances across dialysis tubing. This tubing is a partially permeable membrane which allows both glucose and water to pass through…

In a group of 20 patients at a medical centre, 5 suffered from migraines. Two patients from the group of 20 were picked at random for a survey on the…

A puddle is left on a road after a rain shower. The water in the puddle slowly disappears by evaporation. Three statements about the effect of changing different conditions on…