IGCSE Biology Paper-3: Specimen Questions with Answers 14 - 16 of 358

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Passage

Study the classification chart below.

Picture Shows Types of Microorganisms and Their Examples

Question 14 (1 of 3 Based on Passage)

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Short Answer▾

Which one of the organisms above has been classified wrongly?

‎Explain your answer.

Explanation

Bacillus. Bacillus is an example of Bacteria. It is rod-shaped bacteria and a member of the phylum Firmicutes.

Question 15 (2 of 3 Based on Passage)

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How does yeast useful for human beings?

Explanation

Yeast is useful in bread making, wine making, and for production of alcoholic beverages.

Question 16 (3 of 3 Based on Passage)

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What is the major role of bacteria in ecosystem?

Explanation

Bacteria are used for the process of decomposition at the end of food chains and food webs in which they release useful gases and some nutrients for surviving of other organisms. Some bacteria are key role for nitrogen cycle to convert atmospheric nitrogen into other nitrogenous substances. The excessive Growth destruction of bacteria can affect entire ecosystems. For example, when an aquatic ecosystem polluted by organic waste, the population of aerobic bacteria enhances because the organic waste is food for them. This large number of bacteria then exhausts the oxygen dissolved in the water and other aerobic organisms experience mass death.

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