Transpiration in a well-watered potted plant would be expected to be highest when environmental conditions included: A - VCE - SSCE Biology - Question 11 - 2002 - Paper 1

Transpiration in plants primarily occurs through stomata, which open to release water vapor. The rate of transpiration is influenced by environmental factors such as light intensity and air movement.

1. Light Intensity: Bright sunlight increases the temperature of the leaves, causing water to evaporate more quickly, which in turn increases the rate of transpiration.

2. Air Movement: Moving air enhances transpiration by removing the water vapor that accumulates around the leaves, helping to maintain a concentration gradient that favors water loss from the plant.

Combining both bright sunlight and moving air provides optimal conditions for transpiration, making Option D the correct choice.