AP BIOLOGY

Detailed explanation-1: -Stomata open in response to blue light to facilitate gas exchange between the plant and the atmosphere.

Detailed explanation-2: -In the light, the stomata are open. This is because plants can carry out lots of photosynthesis in the light, converting carbon dioxide and water into glucose and oxygen. The stomata therefore need to open to allow carbon dioxide to diffuse from the atmosphere into the leaves.

Detailed explanation-3: -Stomata are surrounded by two specialized cells called guard cells (Figure 17.1. 2.2. 1). Stomata must open to allow the gas exchange of carbon dioxide and oxygen for efficient photosynthesis (see Photorespiration), and light thus typically triggers stomatal opening.

Detailed explanation-4: -Light intensity: The transpiration rate is increased due to the increase in light intensity. During daytime in the sunlight, the rate of transpiration is faster. This is because the stomata remains open to allow the inward diffusion of carbon dioxide for photosynthesis.