Understanding Stomata and Transpiration

Stomata are primarily located on the lower surface of leaves and play a crucial role in controlling water loss through transpiration. The opening and closing of stomata are regulated by the movement of water and potassium ions in and out of guard cells. During the day, these ions enter the guard cells, causing the stomata to open, while at night, they exit, leading to closure. Stomata also facilitate gaseous exchange in plants.

Where are stomata more commonly found on leaves?

• On the lower surface

• Only on the edges

• Equally on both surfaces

• On the upper surface

What happens if transpiration occurs continuously throughout the day?

• Water will be conserved

• The plant will grow faster

• There will be a significant loss of water

• There will be no effect

What causes the stomata to open during the day?

• Exit of water from guard cells

• Entry of water and potassium ions into guard cells

• Increase in carbon dioxide levels

• Decrease in temperature

What happens to the guard cells at night?

• They increase in size

• They absorb more sunlight

• They lose water and potassium ions

• They become more turgid

What is another important function of stomata besides controlling water loss?

• Seed dispersal

• Gaseous exchange

• Nutrient absorption

• Photosynthesis