From where do trees expel the most oxygen?

Question

From where do trees expel the most oxygen? From their leaves, roots, what?

Heck, where do plants exhale from in general? Is it different for each species of plant?

Answer 1

Stomata (plural, singular stoma). These are pores in the leaves of vascular plants that carry on gas exchange such as intake of CO2 and expelling oxygen and water vapor, called transpiration. No, it is not the same for all plants. Some plants perform gas exchange directly through the cuticle.

Answer 2

Trees expel the most oxygen from stomata in the leaves.
It is different in different plant.
In botany, a stoma (also stomate; plural stomata) is a tiny opening or pore, found mostly on the under-surface (epidermis) of a plant leaf, and used for gas exchange. The pore is formed by a pair of specialized parenchyma cells known as guard cells which are responsible for regulating the size of the opening. Air containing carbon dioxide enters the plant through these openings where it gets used in photosynthesis and respiration. Oxygen produced by photosynthesis in the chlorenchyma cells (parenchyma cells with chloroplasts) of the leaf interior exits through these same openings. Also, water vapor is released into the atmosphere through these pores in a process called transpiration.
Plants carry on the process of photosynthesis by combining together several ingredients in their leaves. Some of these materials are gaseous( carbon dioxide), some are liquid ( water ), and one is energy ( sunlight ). If one were to look at the anatomy of a leaf, it would be easy to see how these materials are brought to the leaf so that they can form the food. The stomata is the way in which this transfer of ingredients can occur, transferring the CO2, light and water from the surrounding atmosphere in to the plant.

In light the guard cells swell, causing the pore to be at its widest, and CO2 diffuses into the leaf and into the cells to be assimilated in photosynthesis. In the dark or under drought conditions the guard cells are not turgid, the stomata are closed and no photosynthesis takes place. Opening of the stomata not only allows CO2 to diffuse into the leaf, but allows water vapor to diffuse out of the leaf. The alteration in the size of the stomata occur in response to a variety of the external stimuli such as light, carbon dioxide concentration and water.

The stomata is situated on the underside of the leaf for the reason that if it were on the top side the plant would lose to much water. Because the guard cells are partially light activated, plants under direct sunlight would constantly have their stomata open and would thus lose much water and the plant dying.

Answer 3

Stomata.
They are tiny pores on the both sides of a leaf which help in expelling Water and Oxygen.
The expelling of water from leaf surface to atmosphere is called transpiration.

Answer 4

Normally from the underside of the leaves where most of the stomata(little mouth type organs) are located

Answer 5

NOT ONLY THROUGH STOMATA BUT THROUGH EPIDERMIS AND LENTICELS.