Plant Water Regulation and Stomata Functions

The video explains the process of transpiration, where water vapor evaporates from plant leaves. It covers the transpiration cohesion tension theory, detailing how water moves up through the plant against gravity. The video discusses the roles of cohesion and adhesion in water movement, the function of xylem and phloem, and the importance of stomata and guard cells in regulating water loss and CO2 intake. It also explains the role of ions and the proton pump in guard cell function.

What is the primary function of transpiration in plants?

• To produce energy through photosynthesis

• To move water and nutrients up the plant

• To release oxygen into the atmosphere

• To absorb nutrients from the soil

Which tissue in plants is responsible for transporting water upward?

• Cortex

• Xylem

• Epidermis

• Phloem

What property of water allows it to stick to itself?

• Adhesion

• Capillarity

• Cohesion

• Surface tension

How does adhesion help water move through a plant?

• By attracting water molecules to each other

• By reducing the plant's water loss

• By allowing water to cling to the plant's sides

• By increasing the water's surface tension

What is the role of stomata in plant leaves?

• To store energy for the plant

• To absorb sunlight for photosynthesis

• To transport water and nutrients

• To regulate water loss and CO2 intake

What happens to guard cells when they become turgid?

• They open the stomata

• They release water

• They absorb CO2

• They close the stomata

Which ions are involved in the opening and closing of stomata?

• Magnesium ions

• Potassium ions

• Sodium ions

• Calcium ions

What is the function of the proton pump in guard cells?

• To release oxygen into the air

• To absorb CO2 from the atmosphere

• To pump H+ ions out of the cells

• To transport water into the cells

Why is it important for plants to regulate the opening and closing of stomata?

• To prevent excessive water loss

• To store more nutrients

• To increase photosynthesis

• To absorb more sunlight

What triggers the movement of potassium ions into guard cells?

• An increase in sunlight

• A decrease in CO2 levels

• A positive charge outside the cell

• A negative charge inside the cell