NCERT Class 12 Biology Chapter 11 Organisms and Populations MCQs & PYQ

In NCERT Class 12 Biology Chapter 11, titled "Organisms and Populations," students explore the concepts of ecology, focusing on how organisms interact with their environment and with other organisms. The chapter covers topics like adaptations, population interactions, population dynamics, and community structure. It explains the concepts of ecological factors, habitat, niche, and the relationship between biotic and abiotic factors. Additionally, students learn about different types of ecosystems and the importance of biodiversity in maintaining ecological balance.

This article provides a comprehensive resource for exam preparation. It includes sample MCQs and subjective questions for CBSE and CUET, alongside downloadable PDFs of Class 12 Biology Chapter 11 MCQs and previous year questions for detailed practice of NCERT Class 12 Organisms and Populations.

NCERT Class 12 Biology Chapters
Chapter 1: Sexual Reproduction in Flowering Plants	Chapter 2: Human Reproduction
Chapter 3: Reproductive Health	Chapter 4: Principles of Inheritance and Variation
Chapter 5: Molecular Basis of Inheritance	Chapter 6: Evolution
Chapter 7: Human Health and Disease	Chapter 8: Microbes in Human Welfare
Chapter 9: Biotechnology: Principles and Processes	Chapter 10: Biotechnology and its Applications
Chapter 12: Ecosystem	Chapter 13: Biodiversity and Conservation

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Class 12 Biology Chapter 11 MCQs

This question bank includes previous years' CUET and CBSE MCQs, along with questions curated by subject experts. Below are 5 sample multiple-choice questions (MCQs) for Class 12 Biology Chapter 11: Organisms and Populations. For the full set of 50 questions, download the PDF using the link provided below.

Identify the equation representing logistic growth of a population.

(a) (b) (c) (d)

DIRECTIONS for questions 57 to 61: Read the given paragraph and answer the given question.

Parasitism has evolved in many taxonomic groups from plants to higher vertebrates. Many parasites have evolved to be host specific in such a way that both host and the parasite tend to co – evolve. In accordance with their life styles, parasite evolve special adaptations and complex life cycle.

Complex life cycle of parasites mean:

(a) Having only one intermediate host.

(b) Having special adaptations to cling on to the host.

(d) Having one or two intermediate hosts to facilitate parasitisation of its primary host

Parasites harm the host by:

(a) Reducing its size.

(b) Improving its growth and reproduction.

(d) Improving its survival, growth and reproduction.

Match List – I with List – II.

List – I	List – II
(A) Cuckoo and Crow	(I) Ectoparasite
(B) Copepods	(II) Commensal Organism
(C) Plasmodium	(III) Brood Parasitism
(D) Orchids and Mango tree	(IV) Endoparasite

Choose the correct answer from the options given below:

(a) (A) – (III), (B) – (II), (C) – (I), (D) – (IV) (b) (A) – (III), (B) – (I), (C) – (IV), (D) – (II)

Identify the statements which are not true with respect to host parasite relationship.

(A) Host and parasite tend to co – evolve.

(B) Parasite have evolved elaborate nervous system for survival.

(C) If the host evolves to reject the parasite, the parasite also evolve to counteract them in order to be successful with the same host species.

(D) If the host evolves special mechanisms for rejecting the parasite, the parasite evolves to be successful in the another host species.

Choose the correct answer from the options given below:

(a) (A) and (B) only (b) (C) and (D) only (c) (B) and (D) only (d) (A) and (C) only

Class 12 Biology Chapter 11 Subjective Questions Without Solutions

This question bank includes previous years' CBSE subjective questions (2 marks and above) without solutions, along with expert-curated questions. Below are 5 sample subjective questions for Class 12 Biology Chapter 11: Organisms and Populations. To access all questions, download the PDF from the link provided below.

1.	"Cattle and goats do not browse the Calotropis plant." Justify the statement giving reasons. (CBSE 2023, 2M)
2.	(i) Give an example of a genus of fungi that forms mycorrhizial association with plants. (ii) How does the plant derive benefits from this association? (CBSE 2023, 2M)
3.	List and explain any two factors that lead to a decrease in the population density of an area. (CBSE 2023, 2M)
4.	Study the graph given below, showing the population growth curves ‘A’ and ‘B’ respectively. Answer the following questions : (a) What is ‘Carrying Capacity’ in respect of Curve ‘B’ indicative of? (b) Mention the action of possible natural forces that could have lead to curve ‘B’. (CBSE 2022, 2M)
5.	Identify the type of pyramid given above. Write the identifying feature on the basis of which you identified it. (CBSE 2022)

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Science Subjects Table

Sub Areas of Chapter 11: Organisms and Populations

Chapter Name	Sub Topics
Organisms and Populations	11.1 Introduction
	11.2 Ecological Factors and Adaptations
	11.3 Population Interactions: Competition, Predation, and Parasitism
	11.4 Population Growth Models
	11.5 Ecological Succession and its Types
	11.6 Biodiversity and Its Significance

Review of NCERT Class 12 Biology Chapter 11

In NCERT Class 12 Biology Chapter 11, "Organisms and Populations," students learn about the interplay between organisms and their environment. The chapter discusses how organisms adapt to different ecological factors and interact with one another through various population dynamics, such as competition, predation, and symbiosis. It also covers the concepts of ecological succession, population growth models, and biodiversity, and its importance in maintaining ecosystem stability.

Mastery of this chapter is essential for understanding the factors influencing species distribution, community structure, and ecosystem functioning. By practicing MCQs and subjective questions, students can strengthen their understanding of ecological processes and prepare for competitive exams.

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