Xylem and Phloem - Part 2 - Transpiration - Transport in Plants

The video explains how water and minerals move through plants via transpiration and the xylem. Transpiration involves water evaporation from leaves, creating a suction that pulls water up from the roots. Water moves through xylem vessels, supporting photosynthesis and cell turgidity. The transpiration stream also transports minerals. Factors like temperature, humidity, and leaf structure affect transpiration rates. Guard cells regulate stomata opening, controlling water loss based on water potential changes during day and night.

What is the primary function of the transpiration pull in plants?

• To transport sugars from leaves to roots

• To create a suction pressure that draws water up through the plant

• To absorb sunlight for photosynthesis

• To release oxygen into the atmosphere

How do water molecules move through the plant in the transpiration stream?

• By active transport using energy

• By diffusion through the cell walls

• By osmosis through the stomata

• By cohesion and adhesion through the xylem

Which of the following factors does NOT affect the rate of transpiration?

• Temperature

• Humidity

• Light intensity

• Soil pH

What role do guard cells play in regulating water loss in plants?

• They produce chlorophyll for photosynthesis

• They open and close the stomata

• They absorb water from the soil

• They transport minerals to the leaves

During the night, what happens to the guard cells that leads to the closing of the stomata?

• They produce more chlorophyll

• They absorb more water and swell

• They lose water by osmosis and become flattened

• They become turgid due to increased sugar production