Plant Physiology: Stomata Function

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Questions and Answers

What is the primary function of stomata in plants?

Gas exchange (correct)
Water storage
Root development
Nutrient absorption

What triggers the opening of stomata in response to light?

Potassium ion accumulation (correct)
Sodium ion depletion
Calcium ion release
Water accumulation

How do guard cells respond when water availability is low?

They become turgid
They absorb more water
They increase osmotic pressure
They lose potassium ions (correct)

What role does transpiration play in plants?

<p>It helps regulate plant temperature (A)</p> Signup and view all the answers

What shape do guard cells take when they swell?

<p>Crescent shape (C)</p> Signup and view all the answers

Flashcards

Stomata function

Stomata are pores on the leaf surface that allow gas exchange, enabling CO₂ intake for photosynthesis and O₂ release.

Guard cells function

Guard cells surround stomata, controlling opening and closing to adjust gas exchange and water loss.

Stomata opening

Light triggers potassium ion accumulation in guard cells, increasing osmotic pressure, leading to water intake and guard cell swelling, opening the stoma.

Stomata closing

Low water triggers guard cells releasing potassium ions, decreasing osmotic pressure, thus water leaves guard cells and causes it to shrink, closing the stoma.

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