Ecosystem
Stand beside a pond and look at it as one working whole. Plants and algae catch sunlight, small animals eat them, fish eat the small animals, and bacteria clear away whatever dies. This chapter follows the living things and the non-living things of such a place as one system. You see who eats whom, how much living matter a place makes in a year, how dead matter rots and how the energy of the Sun passes down the chain and fades. Python does the counting of links, kilojoules and kilograms. It covers the unit of the Indian syllabus (NCERT, NEET) and the matching topics of A-Level, IB and AP Biology.
Part of Biology · High School (11–12) (chapter 30)
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Components and Structure of an Ecosystem
What a pond, a forest and a field have in common. You meet the living and the non-living parts of an ecosystem and the layers of a forest. Then you follow the grazing and the detritus food chains, join them into a food web, and find the trophic level of each organism.
Productivity and Decomposition
How much living matter does a hectare of grass make in a year, and what becomes of it when it dies? Gross and net primary productivity, secondary productivity, what limits them, and the five steps by which dead matter is broken down into humus and minerals. Python follows the numbers.