Ecosystem: Class 12 Biology (Bihar Board) important questions and practice
Ecosystem is chapter 12 of 13 in Bihar Board Class 12 Biology. Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Ecosystem structure and function: productivity, decomposition, energy flow, nutrient cycling
- Primary productivity: GPP and NPP
- Decomposition: fragmentation, leaching, catabolism, humification, mineralisation
- Energy flow, food chains (GFC and DFC) and trophic levels; 10 percent law
- Ecological pyramids: number, biomass, energy (upright and inverted)
What examiners usually ask
- Explain the different steps involved in the process of decomposition
- Why is the pyramid of energy always upright? Give an example of an inverted pyramid of biomass
- Differentiate between gross primary productivity and net primary productivity
Exam tip
Draw the pyramids with correct labelling (producers at the base) and know that the pyramid of biomass is inverted in the sea; the decomposition steps in sequence are a regular 5-mark question, so remember their order.
Ecosystem on other boards and exams
Frequently asked questions
What are the important questions from Ecosystem for Bihar Board Class 12?
The question types listed above repeat most often in Bihar Board Class 12 Biology papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Ecosystem in the Bihar Board Class 12 Biology syllabus?
Yes. Ecosystem is part of the current Bihar Board Class 12 Biology syllabus, as listed on this site from the prescribed textbook.
Can I practise Ecosystem MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.