Why Are Most Stomata Found On The Underside Of Leaves?

Question

Why Are Most Stomata Found On The Underside Of Leaves?

3 Answers

Answer Question

Answer 1

In botany, stomata are tiny holes in plant leaves and stems that let gas in and out of the plant.

They're usually found on the underside of leaves as it's cooler there, so water won't evaporate too quickly, and the plant won't dry out.

Why Aren't Stomata Often Found On The Top Sides Of Leaves?

If stomata were present on the top sides of leaves, then they'd be exposed to a lot more heat and sunlight. This would cause more water to evaporate, and the plant would become dehydrated, wilt, and possibly die.

It makes sense for the stomata to be under the leaves, as this keeps them out of direct sunlight, and they consequently release gas at a more controlled speed, allowing the plant to retain a healthy amount of moisture.

What's The Purpose Of Stomata?
Essentially, stomata help the plant to breathe and photosynthesize. Both respiration and photosynthesis are crucial to a plant's survival.

Answer 2

The underside of the leaf, in most plants, is shaded. A shaded area is cooler, and so less water will evaporate from it. Most plants have a somewhat limited water supply available.

Answer 3

Because if it was on the upper side, more water would evaporate, causing wilting of the plant.