IGCSE Biology Paper-3: Specimen Questions with Answers 357 - 358 of 358

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Question 357

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Short Answer▾

Explain why plants are the start of most food webs.

Explanation

Plants utilize 2 - 10 % of PAR in photosynthesis. The energy formed by the green plants (producers) then flows through different trophic levels of ecosystem i.e.. , primary, secondary, and tertiary consumers. Producers include green plants which can manufacture their own food. These can fix the energy obtained from the sun. Producers are autotrophic, generally chlorophyll bearing organisms.

Passage

Cholera is an example of a transmissible disease.

Question 358 (7 of 7 Based on Passage)

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Define the term transmissible disease.

Explanation

A transmissible disease may be transmitted through direct contact (e. g. blood exchange with an infected host) or through a vector (e. g. contaminated surfaces, fomite, air, foods, animals, etc.) . Examples of transmissible disease are AIDS, herpes, etc.

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