Table of Contents
Does onion have chlorophyll?
We also looked at the cells of an onion bulb. Since the onion bulb grows underground, it doesn’t see any sunlight and so it doesn’t have any chloroplasts for photosynthesis.
Why does a piece of onion skin contain any chloroplasts?
Answer: The clear epidermal cells exist in a single layer and do not contain chloroplasts, because the onion fruiting body (bulb) is used for storing energy, not photosynthesis. Each plant cell has a cell wall, cell membrane, cytoplasm, nucleus, and a large vacuole. …
What part of the onion plant should have chlorophyll present?
Chlorophyll and chloroplasts responsible for photosynthesis are therefore only present in the leafy part of the onion (above ground) and absent in the bulb (which grows below ground).
Why did you not see chloroplasts in the onion root cells?
Why did you not see chloroplasts in the onion root cells? The roots are underground and are not exposed to light. Therefore, they do not need chloroplasts.
Why onion is used in this experiment?
The epidermal cells of onions provide a protective layer against viruses and fungi that may harm the sensitive tissues. Because of their simple structure and transparency they are often used to introduce students to plant anatomy or to demonstrate plasmolysis.
What would we see if we tried observing the onion peel without putting the iodine solution?
Although onions may not have as much starch as potato and other plants, the stain (iodine) allows for the little starch molecules to be visible under the microscope. The onion peel may get decayed or the onion peel would die.
What is the specialized structure of onion?
The onion plant has a fan of hollow, bluish-green leaves and its bulb at the base of the plant begins to swell when a certain day-length is reached. The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem.
What magnification do you need to see onion cells?
40x
Place the slide under 40x magnifying lens and observe the onion cells.
Why can’t you see the vacuole in onion cells?
Onion cells are not green. They get no light, so do not need chloroplasts. appear mainly around the outside of the cell because the central vacuole takes up most of the space and pushes them to the outside. These are blood cells.
Can you extract DNA from an onion?
An onion is used because it has a low starch content, which allows the DNA to be seen clearly. The salt shields the negative phosphate ends of DNA, which allows the ends to come closer so the DNA can precipitate out of a cold alcohol solution.
Which type of cell is smaller the onion or?
An onion cell is approximately 0.13mm long and 05mm wide. An elodea cell is approximately 05mm long and 025mm wide.
Why do onion cells not have chloroplasts?
Onion cells lack chloroplasts because the onion is part of the plant that is not involved in photosynthesis.
What is the edible part of an onion plant?
The edible portion of the onion are the swollen leaves with a bit of stem or bulb. Q: What is the edible part of a onion plant? Write your answer…
Where is the vacuole located in an onion cell?
These functions are made possible by the cell wall, cell membrane, cytoplasm, nucleus and large vacuum of the cell. Light microscopy renders the nucleus of an onion cell visible at the edge of the cytoplasm. The vacuole is visible in the middle of the cell.
Why are there no chloroplasts in a bulb?
Most subterranean root and bulb structures in plants do not have chloroplasts for this reason. Although cells at the very top of the bulb that peek through the soil may develop chloroplasts, the main function of these cells is to protect the plant against harmful pathogens in the soil and to store energy.