What Do Leaves Do for A Plant? The Unsung Heroes of Plant World

What Do Leaves Do for A Plant

Leaves are probably the most important part of a plant. We can’t imagine a plant without having at least a leaf or two. But what do leaves do for a plant exactly?

They offer food and protection and play an important role in the overall function of a plant. And in this article, we will go through all the details regarding leaves and why they are crucial for a plant’s survival.

We will look into the different roles that leave fill, how these roles affect the lifecycle of plants & animals, and more.

At the end of this article, we are confident that you will be able to understand the effect of leaves on plants and why most plants can’t survive without leaves.

So, without further ado, let’s dive into the details, shall we?

What is a Leaf?

What is a Leaf

The scientifical definition of a leaf is the organ that is dedicated to creating the central lateral appendage located around the stem for plants of vascular nature.

In simple terms, a leaf is part of a plant that comes in different shapes & sizes and is directly attached to the plant’s stem or through a stalk. Typically, the color of leaves is green, but there are a lot of color variants depending on the plant we are focusing on.  Usually, you can easily spot a tree by its leaves.

What Does a Leaf Do For the Plants?

Leaves are an integral part of plants, as most plants can’t survive without leaves. This is because leaves are responsible for actions such as:

Photosynthesis: The main process of making food for plants

Respiration: Process of breaking down sugar to generate energy

Water Balance: The process of maintaining the overall water inside plants

Temperature Regulation: Process of ensuring the temperature is balanced through the plant

Oxygen Distribution: Sharing the oxygen generated inside a plant’s body with the environment

Without these mentioned functions, plants can’t survive, and some of them directly involve animals’ survival as well. That’s why the importance of leaves on plants is extreme, to say the least.

What’s The Importance of Leaves in Photosynthesis

What’s The Importance of Leaves in Photosynthesis

Photosynthesis is the process by which plants convert light into food. This process involves respiration, osmosis, and a few other chemical functions. And almost 80% of the entire process is carried inside leaves.

The main role that leaves play during photosynthesis is obtaining sunlight. Plant cells obtain sunlight through chloroplasts. The larger the leaf size is, the more chloroplasts it will have, and it will be able to obtain more sunlight which ultimately means more food.

This aspect is the same for the number of leaves as well. The higher the number, the better the photosynthesis rate will be.

Photosynthesis also affects the lives of animals as the process requires carbon dioxide

And that’s not all. The product of photosynthesis, glucose (sugar), also needs to be broken down for the plant to use as food. And leaves play a significant role in that also. This process is labeled as a plant’s respiration.

What Role Does Leaves Play in a Plant’s Respiration?

Respiration is the process where the sugar produced from photosynthesis is broken down with oxygen to produce chemicals & energy for the plant to grow.

It is the opposite of photosynthesis, as in this process, the plant cells use oxygen to break down the glucose or sugar and produce water, carbon dioxide, and energy.

Respiration occurs in three parts of a plant: roots, leaves, and stems. For leaf respiration, the process is done through stomata. Stomata are small pores that can be found on the bottom side of the leaves.

The number of stomata is quite massive, and the respiratory process begins as soon as the pores open up, and the gas exchange occurs (oxygen in, carbon dioxide out).

Do keep in mind that most leaf respiration occurs during nighttime as in the daytime photosynthesis takes priority.

That being said, there are two types of respiration: one that uses oxygen, aerobic respiration, and one that doesn’t use oxygen for respiration, anaerobic respiration. Anaerobic respiration is very rare among plants, but the ones that do this prefer to continue this process 24/7.

The Importance of Leaves in a Plant’s Water Balance

The Importance of Leaves in a Plant’s Water Balance

Leaves also play a very important role in a plant’s water balance. Plants are natural filters that take water from their roots and give out oxygen to the environment. This process called transpiration is one of the most important features of a plant.

But how does a plant spread out the water? Well, that is where leaves come into play. Plants gather water from the soil with the help of their roots. Then they use the water to obtain homeostasis.

But they don’t need all the gathered water for this and let out the excess water through the stomata located on leaves.

And that’s not all. If, for some reason, the stomata are not opening (during nighttime), then leaves go through the process of guttation where the water is secreted via the leaf blades. The liquid that gets out is often referred to as xylem sap.

This way leaves to ensure that a plant’s water balance is secured and is on optimal level.

The Role of Leaves in a Plant’s Temperature Regulation

A plant’s temperature regulation is solely handled by leaves. High temperatures are actually good for plants as long as it is under their temperature limit. This helps the photosynthesis rate go higher, meaning there will be more food for the plant.

But when the temperature reaches extreme levels, it can be very harmful to the plant. And plants handle this through temperature regulation.

The process is very simple; the leaves work to keep the overall temperature as consistent as possible. They do this by manipulating the evaporation process of water and the reflection of light. The cytoplasm in leaf cells is very crucial for this process.

This way, the overall temperature of the plant remains stable, and there is no drawback from heating. And all of this is only done and can only be done by leaves.

Related Posts:

What Does Cytoplasm Do in A Plant Cell? It Holds Everything Together!

Do Plant Cells Have Enzymes? The Answer May Surprise You!

Do Plant Cells Have Spindle Fibers? Spindle Fibers Role in Cell Division

How Does A Cell Wall Protect A Plant Cell | A Barrier Against External Threats

Do Plant Cells Have Cell Walls? Functions & Importance


Leaves are arguably the most important organ in a plant. They not only offer the plant food but also offers it ways to sustain its life by removing excess water and chemical and even maintaining the overall temperature of the plant.

So use this knowledge to your advantage and start taking care of plant leaves more!

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Mohammed Rujel

Over the Years, I have gained a lot of experience in different aspects of gardening. I actively learned about plants and how to care for them, and also have a lot of experience in dealing with pests and diseases. My expertise is on teaching how to grow healthy plants and make them look their best.

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