Sciences Co-ordinated 9-1 0973: B18 - Human influences on ecosystems Topical Past Paper Questions
Cambridge IGCSE Sciences Co-ordinated 9-1 (0973) past-paper questions on B18 - Human influences on ecosystems, free. This topic is frequently examined across 13 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
(a) Natural gas is a fossil fuel. State the name of one other fossil fuel. [1] (b) Methane is the main constituent of natural gas. Draw the displayed formula of methane. [1] [1] (c) Methane is a small alkane molecule. Large alkane molecules can be cracked to make an alkene and a…
Fig. 3.1 is a diagram showing some of the organisms in the Arctic ecosystem. Fig. 3.1 a) (i) State the name of the type of diagram shown in Fig. 3.1. [1] (ii) Identify the producer in Fig. 3.1. [1] (iii) Identify one organism that occupies the second trophic level in Fig. 3.1. [1…
Some students investigate the reaction between marble chips and dilute hydrochloric acid. They react marble chips of three different sizes, A, B and C, with excess dilute hydrochloric acid. They use the same mass of marble chips, the same concentration of acid and the same temper…
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