NEET Important Questions for Organisms and Population with Answer Key - Free PDF

Before you dive into the major sections of the article, make sure to check the following table to get an overview of the NEET examination.

Overview of Organisms and Population

This chapter falls under the Ecology branch of Biology, which is the study of the relationships of living organisms with the abiotic (Physico-chemical factors) and biotic components (other species) of their environment. Temperature, light, water, and soil are the most important physical factors to which the living organisms on earth have different behavioural responses and adapt accordingly. 

Organisms maintaining a constant internal temperature contribute to optimal performance which is known as homeostasis. Some organisms called regulators who can change the internal environment can also go through homeostasis during changing the external environment. Some others can partially regulate and partially maintain a constant temperature. Other kinds of adaptation include migration or going to hibernation (during winter), or aestivation (during summer) to avoid dealing with harsh external environmental conditions.

Population ecology is an important area of ecology since natural selection occurs at the population level. Ecological effects of any factors affecting the population generally affect the population density, which is expressed in other ways depending on the species of population. Population grows by birth and immigration and declines by death and emigration. The population curve increases exponentially if resources of survival are unlimited which turns to the logistic pattern when resources become limiting.

Interaction between different types of species in a specific habitat depends on the outcome and is classified as predatory, competitive, parasitic, commensalism (one species benefits and the other remains neutral), amensalism (one species suffers and the other remains neutral), and mutualism (both species benefit). Plants have evolved diverse morphological and chemical defences against herbivores. In the environment of competition, it is presumed that the superior species eliminates the inferior ones but many closely related species have evolved to co-adapt and coexist. 

Some Important Topics from the Chapter of Organisms and Population

Around 2% of questions in the NEET exam paper have been tested from the chapter on Organisms and Populations in the last few years. To aid your NEET preparation for Biology, the following is a list of important topics from the chapter that should be studied well while going through this chapter.

1. Organisms and their environment

2. Major abiotic factors

3. Response to abiotic factors 

4. Population and ecological adaptations

5. Population attributes

6. Growth models

7. Population interactions

NEET Exam Pattern - Marks Distribution and Section-wise Total Questions

Check the below table to form a fair idea of the exam pattern for NEET. First and foremost, it is important for candidates to understand that out of a total of 200 questions asked in the exam paper, only 180 need to be answered. The section-wise questions and marks distribution are detailed below.

Syllabus for NEET Biology and List of Important Chapters

The NEET syllabus is essentially composed of three primary science subjects, which are Biology, Chemistry, and Physics. In the following section, students can glance over the syllabus for Biology prescribed for NEET. We have also supplemented this with a list of all important chapters of NEET Biology according to the number of probable questions that can be asked in the exam and the marks weightage of the chapters.

Biology Syllabus for NEET 

The following tabulated data presents the NEET syllabus for Biology covered in the curriculum for Class 11 and Class 12. The detailed syllabus is available for free download in PDF format on Vedantu’s website.

Biology Important Chapters - Weightage and Number of Questions

Why Vedantu's References for Studying this Chapter?

• Questions along with solutions are prepared by experts and, therefore, they are precise and accurate.

• Important questions from every topic are covered.

• Abides by the latest syllabus prescribed by the CBSE and MCI.

• Available for download in PDF format for free.

Quick Links to NEET Important Questions

• NEET 2025 Important Questions

• NEET Physics Important Questions

• NEET Important Questions for Biology

• NEET Chemistry Important Questions

• NEET Previous Year Questions

We are hopeful that you are now aware of the significance of downloading your free copy of the NEET Important Questions for all chapters in the syllabus. These questions and answers will help you evaluate your level of understanding of the topics and you will discover how prepared you are to face the exam and ace it as well. You can visit Vedantu’s NEET Page to check out all the important updates and study material regarding NEET and even sign up for our online classes if you are wanting to reappear in the coming year.

NEET Biology Important Questions - Chapter Pages