Question

Questions
1 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
2 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

Answer:

Bacteria are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.

Explanation:

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Answer 2

Answer:

1.Bacterial cells look rather different to plant and animals cells. They don’t have a proper nucleus. They have a loop in the cytoplasm that carries all the information about how to make a new cell (the genetic information). Bacteria often have other small pieces of genetic information called plasmids. Bacteria are living organisms. What do all living things do? Bacteria take in food and respire. They excrete carbon dioxide and other waste products. They can grow and they reproduce by simply splitting in half. If they have all the things they need, some bacteria can split in half every 20 minutes. Some bacteria have fl agella to

move themselves about.

2. Pond water refers to a standing body of water. This is usually smaller than a lake and may either be man-made or natural. Pond water contains a variety of plant and animal life. While some can be seen with the naked eye, others are too small and will require the use of a microscope to be able to properly observe them.

Some of the organisms that can be found in pond water include:

• Arthropods
• Bacteria
• Protozoa
• Hydras
• Algae

Depending on the pond, students will be able to observe a variety of living things under the microscope.

While students will be able to identify animal organisms under the microscope from the fact that they move, they may have some difficulty identifying some organisms, which may look like plants or fungi.

For instance, students may not be able to differentiate protists, which may look like they belong to the plant kingdom but are neither animals, plants or fungi. This particular organism can be found in wet places such as ponds or fish pools.

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