In the plant-cell diagram, A marks the layer just inside the outer boundary. Text: The wall surrounds the membrane; cytoplasm lies further in around the vacuole. What is A?

The ear diagram marks A at the surface reached after sound has passed along the canal, before the hammer moves. Which label fits A?

On the portal diagram, A marks the area above the horizontal lintel but inside the arch. Text: The doorway is divided below by a trumeau, while the tympanum fills the space over the lintel. What is A?

In the transformer diagram, A is the central part passing through both coils. The input reaches the primary coil, and the output leaves the secondary coil. What should label A be?

The sun diagram marks A as the layer immediately outside the convective zone. Text: Beyond it lies the photosphere, then the chromosphere, while the corona extends furthest out. What is A?

Text: Brushes pass current into the rotating coil, but the split-ring commutator reverses the connections each half-turn. In the motor diagram, A marks the reversing part. What is it?

The ear diagram marks A at the coiled structure. Text: The stirrup passes vibration onwards; the cochlea changes it into nerve signals, which the auditory nerve carries. What is A?

In the plant cell, A marks the organelle where light is used to make sugars. The vacuole stores cell sap, and mitochondria release energy from food. What is A?

Text: In the generator, brushes stay fixed against the slip rings; the slip rings turn with the rotating coil to maintain electrical contact. Label A marks the rotating contact. What is it?

The animal-cell diagram marks A at the stack that modifies and sorts proteins. Ribosomes build them, and rough endoplasmic reticulum begins their processing. What is A?

Process text: Plant material is shredded, moistened, turned to add air, and finally screened for large pieces. Which label belongs at stage 3?

Water treatment is described as screening debris, letting particles settle, filtering through sand, then adding chlorine. What is stage 2?

Oil extraction text: Olives are washed, crushed into paste, pressed to release liquid, and separated into oil and water. Label stage 3.

A survey process runs as follows: design the questionnaire, pilot it, distribute it, analyse the responses, and write the report. Which label fits stage 4?

Glass recycling text: Bottles are sorted by colour, crushed into cullet, melted in a furnace, moulded into new containers, and cooled. What is stage 2?

The ear diagram marks A on the middle of three small bones. Text: The hammer touches the eardrum, the anvil sits between hammer and stirrup, and the stirrup meets the cochlea. What is A?

In the generator diagram, A marks the fixed contact, not the rotating ring. Text: Brushes press on the slip rings, which rotate with the coil. What should A be?

On the portal, A marks the side support. Text: Jambs frame the doorway at the sides, the trumeau divides the centre, and the lintel spans the top. Which label fits A?

The altarpiece diagram marks A on a side panel. Text: Wings flank the central panel; the predella is the narrow strip beneath, and the frame surrounds the whole work. What is A?

The galaxy diagram marks A at the short arm segment containing the Sun. Text: This Orion Spur lies between the Sagittarius Arm nearer the centre and the Perseus Arm farther out. What is A?