Onion cells lack chloroplasts because the onion is part of the plant that is not involved in photosynthesis. The part of the plant eaten by humans is called the bulb, and it resides at the base of the plant. The bulb’s primary purpose is energy storage and holding the flower for the second growing season. Growing near the ground, the bulb is in poor position to collect sunlight.Continue Reading
Photosynthesis is the process by which plants use sunlight, water, carbon dioxide and a chemical called chlorophyll, to create sugars. Chloroplasts are small organelles, located in some plant cells, that contain chlorophyll and enable photosynthesis. The onion is a photosynthetic plant, and it holds numerous chloroplasts in the leaves, which receive much more sunlight, but very few in other parts of the plant.
Onions are typically harvested at the end of their first growing season, after they have shed their leaves and become dormant. However, if left in the ground, a new stem and flower will erupt from within the onion bulb the following season. This can also happen to harvested onions that have been stored for a long period. Onions have been cultivated by humans for at least 7,000 years, and they are grown in a variety of flavors, colors and sizes.Learn more about Botany
Chlorophyll is found in cyanobacteria and the chloroplasts of some plant and algae cells. Chlorophyll is a pigment that absorbs visible light, allowing the organism to carry out the process of photosynthesis. Chlorophyll primarily absorbs the blue and red light from each end of the visible spectrum causing it to reflect green light and giving it a bright green color.Full Answer >
The function of a leaf on a plant is to store a range of cells that are critical to conducting photosynthesis. Leaves have different layers with different cells, but many of these cells contain structures called chloroplasts, which contain the pigment chlorophyll. Chlorophyll is a pigment that absorbs light from the sun, and most of the chlorophyll in a plant is located in leaves.Full Answer >
Most photosynthesis takes place in the leaf of plants in the chloroplasts. The chloroplasts contain a green pigment called chlorophyll that is responsible for absorbing sunlight that hits the leaf.Full Answer >
The light-independent reactions of photosynthesis take place in the stroma of the chloroplasts. These are the same organelles where the light-dependent reactions of photosynthesis take place, but those happen in a different part of the chloroplast: the thylakoid membrane.Full Answer >