Stomata Flashcards

1️⃣ Familiarise yourself with the flashcards:

Look through all the flashcards to see what's on both sides.
Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

Look at the question or prompt on each card and try to remember the answer before flipping it over.
Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

PERSONALISED 1-TO-1 TUTORING

Get support with clear explanations, practice and feedback (Ages 5 to 16).

Want an ad-free experience? Subscribe to remove ads

What are stomata?

Tiny pores in the surface of leaves that let gases move in and out.

To let carbon dioxide in for photosynthesis, and let oxygen and water vapour out.

On the lower surface of the leaf, which is cooler and reduces water loss.

A pair of guard cells control each stoma by changing shape.

In light, water enters the guard cells by osmosis. They become turgid and the pore opens.

They lose water, become flaccid, and the pore closes to save water.

Photosynthesis stops in the dark, so carbon dioxide is not needed. Closing saves water.

Open stomata increase water vapour loss. Closed stomata reduce it.

Sunken stomata in pits trap moist air and cut down water loss.

They can change shape and have chloroplasts to help control opening and closing.

Make a clear nail varnish print of the leaf surface, peel it off, put it on a slide, and view it under a microscope.

Low carbon dioxide makes stomata open; high carbon dioxide can make them close.