IGCSE Biology Paper-3: Specimen Questions with Answers 324 - 326 of 358

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Passage

Leaves are made of tissues.

Question 324 (5 of 6 Based on Passage)

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Write in Brief

One Liner▾

The process by which gases travel through the stomata.

Explanation

Carbon dioxide enters through the cell by the process called diffusion.

Question 325 (6 of 6 Based on Passage)

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Write in Brief

One Liner▾

Outline how water that has entered a root hair cell reaches the stomata.

Explanation

Tranpirational Force

Passage

Cholera is an example of a transmissible disease.

Question 326 (1 of 7 Based on Passage)

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Short Answer▾

Bacteria are often used in biotechnology.

Complete the sentences using words from the list to explain why bacteria are used.

Each word may be used once, more than once or not at all.

Bacteria are useful in biotechnology and … engineering due to their … reproduction rate and their ability to make … molecules.

Explanation

Bacteria are useful in biotechnology and genetic engineering due to their rapid reproduction rate and their ability to make simple molecules.

Bacteria are used in industry in a few ways that generally exploit their natural metabolic capabilities. They are used in manufacture of foods and production of antibiotics, probiotics, drugs, vaccines, starter cultures, insecticides, enzymes, fuels, and solvents. In addition, with genetic engineering technology, bacteria can be programmed to make various substances used in food science, agriculture, and medicine. The genetic systems of bacteria are the foundation of the biotechnology industry.

Reproduction of Bacteria

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