Organisms and Populations: Class 12 Biology (Bihar Board) important questions and practice
Organisms and Populations is chapter 11 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
- Population attributes: birth rate, death rate, sex ratio, age pyramids
- Population growth: exponential and logistic growth models
- Population interactions: predation, competition, parasitism, commensalism, mutualism, amensalism
- Adaptations and the Gause competitive exclusion principle
- Brood parasitism and co-evolution (fig and wasp, orchid Ophrys)
What examiners usually ask
- Explain the logistic growth model with the equation and a graph
- Differentiate between mutualism, commensalism and parasitism with one example each
- What is the competitive exclusion principle? Give an example
Exam tip
Write dN/dt = rN(K-N)/K and label K as carrying capacity on the sigmoid curve; the interaction table with plus/minus/zero signs and examples (orchid on mango, cuckoo and crow, fig and wasp) is a certain question.
Organisms and Populations on other boards and exams
Frequently asked questions
What are the important questions from Organisms and Populations 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 Organisms and Populations in the Bihar Board Class 12 Biology syllabus?
Yes. Organisms and Populations is part of the current Bihar Board Class 12 Biology syllabus, as listed on this site from the prescribed textbook.
Can I practise Organisms and Populations MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.