What is a chloroplast?
A chloroplast is a tiny structure that is found in plant cells. Some types of algae, which are protists, also have chloroplasts. However, animal cells do not have chloroplasts.
Chloroplasts are so small that they are called organelles. It means they are smaller than a cell – so tiny that they can only be seen through a microscope.
Chloroplasts are mostly oval-shaped blobs but can also come in shapes like stars and ribbons. A chloroplast is protected by a smooth outer membrane that holds its material. In addition, they contain chlorophyll, which is the pigment that gives plants their green color.
Chloroplasts are essential to plant growth because they turn sunlight into energy for the plant. It is a process called photosynthesis.
Chloroplasts are multi-talented. They also store energy for the plant cell and fight off diseases. They are an essential part of the cell’s immune system, which helps it to stay healthy. But, just like humans, plants can also catch diseases. So the chloroplasts need to protect the plant from any nasty illnesses it might get.
Parts of a chloroplast
The chloroplast is a very clever part of the plant cell. It is made up of even tinier parts, all with different roles to play. Here are the parts of a chloroplast, explained to kids:
- Outer membrane– this is the skin around the chloroplast that helps protect it. The outer membrane is permeable, which means that small molecules can pass through it from the plant cell into the chloroplast. To understand permeability, imagine a sieve. You wouldn’t be able to get a tennis ball through a sieve! The holes are too small. But if you poured a cup of sand into a sieve, it would be able to pass through the holes. That is how tiny, microscopic molecules can enter the chloroplast through the outer membrane.
- Inner membrane– this adds another layer of protection to the chloroplast.
- Stroma– this is the fluid that all of the parts of a chloroplast float inside.
- Thylakoids– these are tiny disk-shaped sacks that contain chlorophyll.
- Lamella– these are bridge-like spacers within the chloroplast that help keep the thylakoids spaced out. Think of them as the social distance enforcers of the chloroplast. Staying spread out helps the chlorophyll inside the thylakoids to absorb as much light energy as possible.
Other parts of plant cells
Plant cells contain a lot of different parts that work together. It includes chloroplasts, cytoplasm, and a nucleus. The cytoplasm is the liquid that fills up the inside of a cell. The nucleus is in charge of what the plant cell does. The nucleus works a little bit like the brain of an animal because it tells everything else in the cell what to do.
What is photosynthesis?
Photosynthesis is the process that plants use to turn sunlight into food. Chloroplasts are essential for the operation of photosynthesis. The chlorophyll inside the chloroplast captures energy from the sunlight and stores it. Then it is combined with carbon dioxide and water to make sugar that the plant can use for energy. After photosynthesis, the plant gives off oxygen to the surrounding air.
Why is photosynthesis important?
Photosynthesis is essential because plants are the basis of all life on Earth. The oxygen plants produce during photosynthesis is the same oxygen in the air that keeps us alive.
Green plants and trees use photosynthesis to make their food from sunlight, carbon dioxide, and water. Not only does photosynthesis create oxygen, but it also creates food for animals and humans who eat plants, vegetables, fruits, and more. The whole world depends on photosynthesis so that it can exist and thrive.
Facts about the chloroplast for kids
We’ve covered a lot of information, so it’s time for some facts about chloroplast for kids!
- The “chloro” part of the words chloroplast and chlorophyll comes from the Greek word “chloros.” “Chloros” means green in Greek.
- Scientists estimate that there could be around half a million chloroplasts in one single square millimeter of a leaf. That means billions of chloroplasts in a whole plant.
- Chloroplasts can move within the plant cell to find the best place to absorb sunlight. That’s like humans going to the beach to enjoy the sunshine.
- Chloroplasts are sometimes called the “kitchen of the cell.” It is because they create and store food for the plant.Top of Form
