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Microorganisms Practice Questions

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Updated on Sep 21, 2011

Review these concepts at: Microorganisms Study Guide

Practice Questions

1. Fungi consume dead organic matter and thus play an important role in an ecosystem by

a. making nutrients available for recycling back into the soil.

b. producing oxygen by photosynthesizing.

c. producing oxygen by respiration.

d. living in mostly aquatic environments.

2. Just in numbers alone (but not necessarily mass), which microorganism is the most numerous organism on Earth?

a. paramecium from the Protist Kingdom

b. yeast from the Fungi Kingdom

c. euglena from the Protist Kingdom

d. bacteria from the Moneran Kingdom

3. Which Kingdom contains organisms that are able to produce nitrates from the nitrogen in the air?

a. Animal

b. Plant

c. Moneran

d. Protist

4. Why do members of the Fungi Kingdom produce spores?

a. They are resistant to environmental conditions.

b. They contain special enzymes.

c. They are able to photosynthesize.

d. They are part of the support system.

5. Which of the following is true about the protist euglena?

a. It can only photosynthesize under certain conditions.

b. It is only heterotrophic.

c. It is both autotrophic and heterotrophic.

d. It has no chloroplasts.

6. Members of the Kingdom Monera are found in our digestive tracts and perform which of the following functions?

a. produce carbohydrates

b. produce vitamins

c. produce lipids

d. produce proteins  

Answers

1. a. The abilities of fungi (and monerans) to engage in decomposition are critical for making nutrients available to new generations of plants.

2. d. Bacteria, largely because of their ability to rapidly reproduce asexually, are by far the most numerous organisms on Earth.

3. c. The bacteria in Kingdom Monera are responsible for converting atmospheric, gaseous nitrogen into chemical salts called nitrates that help fertilize plants.

4. a. Spores are produced as part of the reproductive cycle and are resistant to environmental conditions like temperature and moisture extremes.

5. c. Euglena can produce its own food through photosynthesis as plants do, and it can consume food as animals do. Euglena does contain chloroplasts that are the site of photosynthesis.

6. b. The bacteria in our digestive tracts are beneficial in the digestion of food, and they produce at least one vitamin, Vitamin K, which helps in the coagulation of blood.

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