What Are Pigments Their Types and Functions in Biology
Are you a biology fanatic? Have you ever been fascinated about how the science behind every living thing works? Well, biology is all about that. With biology in our lives, we get to study and learn all about plants, animals, humans, basically everything! One such fascinating topic amongst many pigments. Interested to learn more about them? Let's get started then. Now, what are pigments? This is one of the basic questions to arise in your minds. They are biochromes or substances that are produced by any living organism that has color. You can also call them color pigments. You can classify them into two major types as plant pigments and flower pigments. The most common pigment that you can see around you every day is the green pigment in plants.
It is a result of the chlorophyll present in plants. You can see the microscopic view of it in the image below.
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What is the Meaning of Pigment?
When we talk about what is the principal pigment of plants, in simple terms, you can say that pigments are the components that give color to every living thing on this planet. In plants, you can see these pigments in leaves, and in flowers, you can see them in their petals. Not just in plants and flowers, pigments are present in animals as well. We need to understand the reason behind it.
So what is pigment biology? It is the science due to which color pigments are produced by living organisms. They are produced due to color absorption by a particular living organism from its environment. Different organisms absorb different wavelengths of light and this results in the variations that are found in color pigments.
What is Meant by Pigment Used in Industrial Purposes?
Now, what are pigments from the Industrial perspective? Pigments used for industrial purposes are the insoluble solid substances that are obtained by mixing two or more compounds. They are used in paints, cosmetics, inks, fabrics, plastics, and many other industries. They can be classified into 2 types as;
Organic Pigments
They consist of carbon chains and rings in their structure but may have some type of metallic element in their composition that is added to stabilize the parent structure.
Inorganic Pigments
They consist of chemical compounds that do not have carbon. They usually consist of metallic salts that are formed due to interaction between compounds.
Types of Pigment in Plants
There are different types of pigments that a plant can have. The variations in plant pigments are due to the different wavelengths of light that they absorb. The plants that have strong color pigments are also used to manufacture natural dyes. So what are the types of plant pigments? Let’s have a look at them.
Now, as per the earlier discussion, we have the answer to the question “What is the main pigment in plants?”. The answer to it is chlorophyll, which is the green pigment in plants. It is the most abundant plant pigment in the world. So what are some of the other plant pigments or what pigments are found in plants?
Apart from the green pigment in plants, Carotenoids, Flavonoids, and Betalains are some of the other plant pigments. When it comes to fruits and vegetables, color pigments are present in them too. To name a few, the yellow pigment found in them is called Lutein whereas the red pigment in plants is Lycopene.
Anthocyanins are water-soluble pigments that are present in the flower petals of different species.
The green pigment in plants has variations depending upon the living organism that they occur in. The four types of chlorophyll in plants are chlorophyll-a, b, c, d. These chlorophyll pigment types are found in different types of algae, higher plants, and cyanobacteria spending upon the wavelength of light that they absorb.
The Types of Chlorophyll in Algae are Categorized as Follows
Type-a in algae.
Type-b in green algae.
Type-c in brown algae.
Type-d in red algae.
Importance of Pigments
So far, we have discussed the answers and facts for questions like “what are pigments?” and “what is meaning of pigment?”. We are yet to discuss the question “what do pigments do for plants?”. So let’s get started.
Chlorophyll or the green pigment in plants is one of the most important components that the plants need to prepare their food. The absorption of light that results in the generation of the green pigment helps the plants to carry out photosynthesis and to prepare their food.
Fun Facts
Are you aware that leaves change their color? Yes, that’s right. Due to the change in season, especially during Autumn, it becomes difficult to absorb most of the sunlight for leaves as the days get shorter. The chlorophyll supply needed for plants to make food is not met and as a result, they start to use the chlorophyll that was stored all year along.
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FAQs on Pigments in Living Organisms
1. What are pigments in biology?
Biological pigments are colored molecules that absorb specific wavelengths of light and give color to cells and tissues. They play important roles in living organisms, such as:
- Absorbing light energy for photosynthesis (e.g., chlorophyll in plants)
- Providing coloration for camouflage or attraction (e.g., melanin, carotenoids)
- Protecting against harmful radiation like UV light
2. What is the function of pigments in plants?
The main function of pigments in plants is to absorb light energy for photosynthesis. Different plant pigments capture different wavelengths of light:
- Chlorophyll a – primary pigment that absorbs blue and red light
- Chlorophyll b – accessory pigment that expands the absorption spectrum
- Carotenoids – absorb blue and green light and protect against photooxidative damage
3. What are the main types of pigments in plants?
The main types of plant pigments are chlorophylls, carotenoids, and anthocyanins. These include:
- Chlorophylls – green pigments essential for photosynthesis
- Carotenoids – yellow, orange, or red pigments that assist in light absorption and protection
- Anthocyanins – red, purple, or blue pigments found in vacuoles of flowers and fruits
4. How does chlorophyll absorb light?
Chlorophyll absorbs light by using its porphyrin ring structure to capture photons and excite electrons. The process occurs in these steps:
- Light energy strikes the chlorophyll molecule
- An electron in the molecule becomes excited to a higher energy level
- The excited electron enters the electron transport chain in the thylakoid membrane
5. What is the difference between chlorophyll and carotenoids?
The key difference is that chlorophyll is the primary photosynthetic pigment, while carotenoids are accessory pigments that assist and protect. Differences include:
- Color: Chlorophyll is green; carotenoids are yellow, orange, or red
- Function: Chlorophyll directly participates in photosynthesis; carotenoids transfer energy and prevent oxidative damage
- Light absorption: Chlorophyll absorbs mainly red and blue light; carotenoids absorb blue-green light
6. What is melanin and what is its function?
Melanin is a biological pigment that provides color to skin, hair, and eyes and protects against UV radiation. It is produced by melanocytes in animals and functions to:
- Absorb and dissipate harmful ultraviolet (UV) rays
- Reduce DNA damage in skin cells
- Determine variations in skin and hair color
7. Where are pigments located in plant cells?
In plant cells, pigments are mainly located in chloroplasts and vacuoles. Specifically:
- Chlorophyll and carotenoids are embedded in the thylakoid membranes of chloroplasts
- Anthocyanins are stored in the central vacuole
8. Why do leaves change color in autumn?
Leaves change color in autumn because chlorophyll breaks down, revealing other pigments. During shorter daylight periods:
- Production of chlorophyll decreases
- Green color fades as chlorophyll degrades
- Carotenoids (yellow/orange) and sometimes anthocyanins (red/purple) become visible
9. What are accessory pigments in photosynthesis?
Accessory pigments are photosynthetic pigments that assist chlorophyll by absorbing additional wavelengths of light. They include:
- Chlorophyll b
- Carotenoids
- In some algae and cyanobacteria, phycobilins
10. Can you give examples of pigments in animals and plants?
Examples of biological pigments include chlorophyll in plants and melanin in animals. Common examples are:
- Chlorophyll – green pigment in plants and algae
- Carotenoids – orange pigment in carrots and some bird feathers
- Anthocyanins – red or purple pigment in flowers and fruits
- Melanin – brown or black pigment in human skin and hair
