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Questions and Answers
What is transpiration?
What is transpiration?
- The process of water movement through a plant and its evaporation from aerial parts (correct)
- The process of mineral nutrient uptake by the plant
- The process of energy expenditure by the plant
- The process of water absorption by plant roots
What happens when water uptake by the roots is less than the water lost to the atmosphere by evaporation?
What happens when water uptake by the roots is less than the water lost to the atmosphere by evaporation?
- Plants increase CO2 absorption to counterbalance the water loss
- Plants increase nutrient uptake to compensate for the water loss
- Plants close small pores called stomata to decrease water loss (correct)
- Plants reduce transpiration to conserve water
How is water with dissolved mineral nutrients absorbed into the roots?
How is water with dissolved mineral nutrients absorbed into the roots?
- By diffusion
- By osmosis (correct)
- By translocation
- By active transport
What enables mass flow of mineral nutrients in plants?
What enables mass flow of mineral nutrients in plants?
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What explains how leaves pull water through the xylem?
What explains how leaves pull water through the xylem?
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Study Notes
Transpiration and Water Uptake
- Transpiration is the process by which water is transported through a plant, from the roots to the leaves, and is then evaporated into the air as water vapor.
Water Deficit
- When water uptake by the roots is less than the water lost to the atmosphere by evaporation, a water deficit occurs, which can lead to water stress in plants.
Absorption of Mineral Nutrients
- Water with dissolved mineral nutrients is absorbed into the roots through a process of selective uptake, where certain ions are actively transported across the root cell membrane.
Mass Flow of Mineral Nutrients
- The mass flow of mineral nutrients in plants is enabled by root pressure, which is the pressure generated by the osmotic uptake of water into the roots.
Transpiration Pull
- The cohesion-tension theory explains how leaves pull water through the xylem, where water molecules are drawn upward through the xylem by the negative pressure generated by transpiration, creating a continuous column of water from the roots to the leaves.
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