How is gas exchanged in plants?

Gaseous exchange in plants is achieved by stomata and lenticels. The epidermis has tiny pores called stomata (singular, stoma) that control transpiration and gas exchange with the air. During the day when photosynthesis occurs, the oxygen released from the process is utilized for respiration.

What is gas exchange GCSE?

Gaseous exchange occurs at the alveoli in the lungs and takes place by diffusion. The alveoli are surrounded by capillaries so oxygen and carbon dioxide diffuse between the air in the alveoli and the blood in the capillaries.

What is gas exchange called in plants?

stomata
The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapor in transpiration) occurs through pores called stomata (singular = stoma).

Why is gas exchange important to a plant?

Gas exchange is super important for plants because they use both oxygen gas and carbon dioxide gas for two cellular processes.

When does gas exchange take place in plants?

Gas exchange in plants. Plants respire all the time, but photosynthesis only happens during the day. This means that the net gas exchange from a leaf depends on the light intensity.

How does the stomata control gas exchange in the leaf?

The stomata control gas exchange in the leaf. Each stoma can be open or closed, depending on how turgid its guard cells are. In the light, the guard cells absorb water by osmosis, become turgid and the stoma opens. In the dark, the guard cells lose water, become flaccid and the stoma closes.

How is hydrogen carbonate used in gas exchange?

Hydrogencarbonate indicator is used to show carbon dioxide concentration in solution. The table shows the colour that the indicator turns at different levels of carbon dioxide concentration. A leaf is placed in a stoppered boiling tube containing some hydrogen carbonate indicator solution. The effect of light intensity can then be investigated.

What are the results of gas exchange experiments?

Gas exchange experiments Tube 1 Tube 2 Tube 3 Tube 4 Indicator colour at the end Yellow Magenta Purple Red Carbon dioxide concentration Highest Low Lowest Atmospheric level Respiration ✓ ✓ ✓ ✗ Photosynthesis ✗ ✓ ✓✓ ✗