AP Bio Lab 9 Transpiration

Transpiration

• the evaporation of water through the leaf surface and stomata

• loss of water from the vascular tissues in the margins of leaves.

guttation

• loss of water from the vascular tissues in the margins of leaves.

• the evaporation of water through the leaf surface and stomata

• if a plant is exposed to room temperature then it will have no effect on the rate of transpiration because room temperature is the control of the experiment, and thus will have no effect on the plant.

what controls the transport of water

• water potential

• high to low

• solute concentration and pressure

• mist, light, and fan: wind, humidity, and heat

• room temperature

water potential always moves

• water potential

• high to low

• solute concentration and pressure

• mist, light, and fan: wind, humidity, and heat

• room temperature

what affects water potential

• water potential

• high to low

• solute concentration and pressure

• mist, light, and fan: wind, humidity, and heat

• room temperature

3 conditions of the lab

• water potential

• high to low

• solute concentration and pressure

• mist, light, and fan: wind, humidity, and heat

• room temperature

control of the lab

• water potential

• high to low

• solute concentration and pressure

• mist, light, and fan: wind, humidity, and heat

• room temperature

room temp hypothesis

• if a plant is exposed to room temperature then it will have no effect on the rate of transpiration because room temperature is the control of the experiment, and thus will have no effect on the plant.

• if a plant is exposed to heat then it will have an increased transpiration rate because the heat hitting the plant increased the amount of water pulled in by the plant because it increased the rate of evaporation on the leaves.

• if a plant is exposed to humidity then it has a decreased transpiration rate because the moist environment and shielding decreased the transpiration rate because less evaporation was occurring.

light (heat) hypothesis

• if a plant is exposed to room temperature then it will have no effect on the rate of transpiration because room temperature is the control of the experiment, and thus will have no effect on the plant.

• if a plant is exposed to heat then it will have an increased transpiration rate because the heat hitting the plant increased the amount of water pulled in by the plant because it increased the rate of evaporation on the leaves.

• if a plant is exposed to humidity then it has a decreased transpiration rate because the moist environment and shielding decreased the transpiration rate because less evaporation was occurring.

mist (humidity) hypothesis

• if a plant is exposed to room temperature then it will have no effect on the rate of transpiration because room temperature is the control of the experiment, and thus will have no effect on the plant.

• if a plant is exposed to heat then it will have an increased transpiration rate because the heat hitting the plant increased the amount of water pulled in by the plant because it increased the rate of evaporation on the leaves.

• if a plant is exposed to humidity then it has a decreased transpiration rate because the moist environment and shielding decreased the transpiration rate because less evaporation was occurring.