Answer:
Petri plates are incubated upside down to prevent contamination.
Explanation:
The plates are always incubated inverted or turned upside down on their covers during storage. This is done to prevent evaporation if plaque is stored for long periods, which can affect the growth efficiency of bacteria, or allow contamination by multiplying unwanted organisms such as mold.
Once the plaques have been filled with a damp suspension of bacteria, it should be allowed to evaporate shortly before overnight incubation. However, a moderate amount of moisture will still be present. If plaque is not inverted during incubation, bacteria will not be able to attach to the culture medium properly, which will either prevent them from growing and forming colonies properly or will encourage the growth of undesirable microorganisms.
Any of these results will invalidate the experiment. In addition, any condensation or moisture can cause streaking, which will make it difficult to select and analyze separate colonies. After bacteria form colonies, plaque is also stored upside down to maintain moisture levels.
Dependent would be amount of colds.
Controlled would be amount of vitamin C taken.
Independent could be the fact that vitamin C will be taken daily.
The answer is D) Both produce oxygen
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Answer:
Explanation:
Simulation is imitating a process. It is doing exactly like a system will do. It can be used in technologies, education, health, training,
safety engineering. Simulation can be used when the original or exact system is not in place, or cannot be accessed.
A model is a process that helps to understands a system. A model is like an example to follow in achieving a result. A model may not be followed judiciously such that you may require an aspect of the model and then use but not necessarily all attributes while a simulation does exactly what the system does.
The correct answer is the mesophyll tissue from a leaf.
The mesophyll is the term given to the two cell layers present within the leaves of a plant. The first layer is situated within the epidermis but above the second layer. The second layer is the palisade parenchyma cells.
The palisade layer is loaded with ample of chloroplasts, making it the layer most directly accountable for photosynthesis. These chloroplasts absorb the maximum part of the light energy utilized by the leaf.
