Question

Bacterial cells are much smaller than human cells. Yeast cells are about the same size as human cells. Use this information to work out which photograph above - the one of bacteria, or the one of yeast - has been magnified the most. The photograph on the right shows some pond water, under a microscope. Suggest how you can tell which micro-organisms are algae, and which ones are protozoa. Can you spot the protozoan that is reproducing?

Answer 1

Bacterial cells are smaller than human cells while yeast cells are about the same size as human cells. To determine algae and protozoa in a photograph, you can consider their color and photosynthetic capabilities. Spotting a reproducing protozoan in the photograph may require more specific information or context.

Step-by-step explanation:

Based on the information provided, bacterial cells are much smaller than human cells, while yeast cells are about the same size as human cells. Therefore, if the photograph of bacteria appears larger than the photograph of yeast, it means that the bacteria photograph has been magnified more. It is important to note that magnification refers to the increase in apparent size of an object, compared to its actual size, when viewed through a microscope.

To determine which micro-organisms are algae and which ones are protozoa, it is necessary to observe their characteristics. Algae are photosynthetic organisms that contain chlorophyll and other pigments, giving them green or brownish colors. Protozoa, on the other hand, are single-celled organisms that feed on organic matter, and they do not have chlorophyll or pigments. Therefore, identifying the color and photosynthetic capabilities can help distinguish between algae and protozoa.

As for spotting a protozoan that is reproducing, it may be challenging without further context or specific information about the protozoa being observed. Protozoa can reproduce using various methods, such as binary fission, multiple fission, or conjugation. Depending on the species and reproductive method, different structures or processes may be involved. Therefore, additional details or specific observations would be needed to identify a protozoan that is reproducing in the photograph.

Answer 2

Bacterial cells are smaller than human cells, while yeast cells are similar in size. The photo of bacteria has been magnified more. Algae and protozoa can be differentiated by their characteristics. Protozoa reproduction can be observed through careful observation.

Step-by-step explanation:

The size of bacterial cells is typically about 1 µm, while yeast cells are about the same size as human cells, which can be roughly 10 µm across. Based on this information, we can conclude that the photograph of bacteria has been magnified more than the photograph of yeast.

To determine which microorganisms in a photograph are algae and which are protozoa, we would need to observe their characteristics. Algae are usually unicellular or multicellular and photosynthetic, whereas protozoa are typically single-celled and heterotrophic. By examining the organisms' structures and behaviors, we can differentiate between algae and protozoa.

Observing protozoa reproducing may require careful observation of their behaviors and structures. Some protozoa reproduce through binary fission, where one individual splits into two identical offspring. By closely examining the organisms' movements and structures, we may be able to spot protozoa in the process of reproducing.