Biology - 4BI1 PearsonEdexcel

Cycles Within Ecosystems

Muhtasari

Carbon and nitrogen are essential to every living organism, yet there is a fixed amount of each element on Earth. If these elements were not recycled, life would have run out of raw materials long ago. Instead, natural processes move carbon and nitrogen through the atmosphere, soil, water and living things in continuous loops.

In this lesson you will trace the carbon cycle from photosynthesis through respiration, decomposition and combustion, and then follow the nitrogen cycle through the specialised bacteria that convert nitrogen into forms plants can absorb. Both cycles are tested regularly on Edexcel papers, and understanding them will also help you explain human impacts on the environment.

Malengo

Describe the stages in the carbon cycle, including respiration, photosynthesis, decomposition and combustion
Describe the stages in the nitrogen cycle, including the roles of nitrogen fixing bacteria, decomposers, nitrifying bacteria and denitrifying bacteria

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Maelezo ya Somo

The carbon atoms in your body have been recycled countless times. Some may once have been part of a dinosaur, a prehistoric fern, or a molecule of volcanic gas. Unlike energy, which flows through ecosystems and is eventually lost as heat, chemical elements are endlessly reused. The carbon and nitrogen cycles describe the routes these atoms take - and human activity is now changing both cycles in ways that affect the whole planet.

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Which process removes carbon dioxide from the atmosphere? A) Respiration B) Combustion C) Photosynthesis D) Decomposition Answer: C
Which type of bacteria converts nitrates back into nitrogen gas? A) Nitrogen-fixing bacteria B) Nitrifying bacteria C) Denitrifying bacteria D) Decomposers Answer: C
Where are nitrogen-fixing bacteria found in leguminous plants? A) In the leaves B) In the stem C) In the root nodules D) In the flowers Answer: C
Which of the following returns carbon dioxide to the atmosphere? A) Photosynthesis B) Absorption by oceans C) Respiration D) Nitrogen fixation Answer: C
What do nitrifying bacteria convert ammonium compounds into? A) Nitrogen gas B) Proteins C) Nitrates D) Carbon dioxide Answer: C

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Biology Student Book

Manukuu: First edition

Mchapishaji: Pearson Education

Mwaka: 2017

ISBN: 978-0-435-18426-5

Maelezo: Endorsed student book covering the full 4BI1 specification.

Jifunze zaidi kutoka vyanzo huria

Sehemu ya kitabu Biogeochemical Cycles OpenStax · Biology
Discuss the biogeochemical cycles of water, carbon, nitrogen, phosphorus, and sulfur

"Biology: Biogeochemical Cycles" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/46-3-biogeochemical-cycles. Access for free at https://openstax.org/books/biology/pages/1-introduction
Sehemu ya kitabu Prokaryotic Metabolism OpenStax · Biology
Identify the macronutrients needed by prokaryotes, and explain their importance

"Biology: Prokaryotic Metabolism" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/22-3-prokaryotic-metabolism. Access for free at https://openstax.org/books/biology/pages/1-introduction

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