Chapter 1: The Living World – Short Answer Type Questions

CBSE Class 11 Biology Short Answer Questions – Chapter 1: The Living World (NCERT Based)

Course Details

Course: CBSE Class 11 Biology
Syllabus: NCERT
Unit: Unit I – Diversity in Living World
Chapter: Chapter 1 – The Living World
CBSE Board Examination: Central Board of Secondary Education – Class 11 (School & Annual Examinations)

CBSE Class 11 Biology Chapter 1 The Living World – 40 Short Answer Questions with Answers (NCERT)

Section A: Characteristics of Living Organisms (Q1–Q10)

1. Explain growth as a characteristic of living organisms.
   Growth in living organisms is an internal process involving cell division and increase in biomass. Unlike non-living objects, living organisms grow from within and show organized development at cellular and tissue levels.
2. Why is reproduction not considered a defining feature of life?
   Although reproduction is common in living organisms, some organisms like mules and sterile worker bees do not reproduce. They are still considered living due to presence of metabolism and cellular organization.
3. Define metabolism and explain its importance.
   Metabolism is the sum of all biochemical reactions occurring in a living organism. It includes anabolic and catabolic reactions and is essential for growth, maintenance, repair, and survival.
4. Differentiate between anabolism and catabolism.
   Anabolism involves constructive reactions that synthesize complex molecules, such as photosynthesis. Catabolism involves destructive reactions like respiration, where complex substances are broken down to release energy.
5. Why is metabolism considered a defining characteristic of life?
   Metabolic reactions occur only in living cells. Non-living objects do not show metabolic activity, making metabolism a unique and defining feature of living organisms.
6. Explain cellular organization in living organisms.
   All living organisms are made of one or more cells. Cells form tissues, tissues form organs, and organs work together as systems, ensuring proper functioning of the organism.
7. What is consciousness in living organisms?
   Consciousness is the ability of organisms to sense and respond to environmental stimuli such as light, temperature, chemicals, or sound, ensuring survival and adaptation.
8. How do plants show responsiveness?
   Plants respond to stimuli like light, gravity, water, and chemicals through movements such as phototropism and geotropism, demonstrating sensitivity to their environment.
9. Why are viruses considered at the boundary of living and non-living?
   Viruses exhibit life-like properties only inside a host cell where they replicate, but remain inert outside, lacking metabolism and cellular organization.
10. State any two distinguishing features of living organisms.
    Living organisms exhibit metabolism and cellular organization. They also show growth, responsiveness, and the ability to adapt to environmental changes.

Section B: Diversity and Classification (Q11–Q20)

11. What is meant by biological diversity?
    Biological diversity refers to the vast variety of living organisms found on Earth, differing in size, structure, habitat, and mode of life.
12. Why is classification of organisms necessary?
    Classification helps in organizing biological information, making the study of organisms systematic and easier, and understanding evolutionary relationships.
13. Define classification in biology.
    Classification is the scientific arrangement of organisms into groups and subgroups based on similarities, differences, and evolutionary relationships.
14. What is the role of classification in identifying organisms?
    Classification provides a systematic framework that helps scientists identify organisms correctly and place them in appropriate groups.
15. What is taxonomy?
    Taxonomy is the branch of biology concerned with identification, naming, and classification of organisms according to established rules.
16. Explain systematics.
    Systematics is the study of organism diversity and evolutionary relationships, including taxonomy and phylogenetic history.
17. What is phylogeny?
    Phylogeny refers to the evolutionary history and relationships among different groups of organisms based on common ancestry.
18. Mention the criteria used for classification of organisms.
    Organisms are classified based on morphological features, internal structure, reproductive methods, and molecular characteristics.
19. Differentiate between artificial and natural classification.
    Artificial classification uses a few observable traits, while natural classification considers multiple characteristics and evolutionary relationships.
20. How does classification help in studying evolution?
    Classification reveals similarities and differences among organisms, helping scientists trace evolutionary links and common ancestry.

Section C: Nomenclature and Taxonomy (Q21–Q30)

21. What is biological nomenclature?
    Biological nomenclature is the system of assigning scientific names to organisms to ensure universal identification.
22. Explain binomial nomenclature.
    Binomial nomenclature assigns each organism a two-word scientific name consisting of genus and species.
23. Who introduced binomial nomenclature and why?
    Carolus Linnaeus introduced binomial nomenclature to standardize naming and avoid confusion caused by local names.
24. State the rules of binomial nomenclature.
    Scientific names are Latinized, written in italics, with genus capitalized and species in lowercase.
25. Why are scientific names preferred over common names?
    Scientific names are universal and standardized, avoiding confusion caused by multiple common names across regions.
26. What does the genus name signify?
    The genus name indicates a group of closely related species sharing common characteristics.
27. What is meant by taxonomy hierarchy?
    Taxonomic hierarchy is the arrangement of organisms into successive categories from species to kingdom.
28. Define species.
    Species is the smallest taxonomic unit, consisting of organisms capable of interbreeding and producing fertile offspring.
29. Why is species considered the basic unit of classification?
    Species represents the most specific level of classification and reflects natural breeding populations.
30. What is the importance of taxonomic hierarchy?
    It provides a systematic framework to study and compare organisms at different levels of similarity.

Section D: Taxonomic Categories and Aids (Q31–Q40)

31. List the major taxonomic categories in ascending order.
    Species, genus, family, order, class, phylum or division, and kingdom.
32. Define genus and family.
    A genus is a group of closely related species, while a family consists of related genera.
33. What are taxonomical aids?
    Taxonomical aids are tools that assist in identification, naming, and classification of organisms.
34. Explain the role of herbarium.
    A herbarium stores preserved plant specimens used for reference, identification, and scientific study.
35. How are plant specimens preserved in a herbarium?
    Plants are dried, pressed, mounted on sheets, and labeled with scientific information.
36. What is a museum in biological studies?
    A museum preserves plant and animal specimens in jars or as models for educational and research purposes.
37. Explain the importance of botanical gardens.
    Botanical gardens maintain living plant collections for identification, study, and conservation.
38. What is a zoological park?
    A zoological park conserves wild animals in protected environments for study and public awareness.
39. What are taxonomic keys?
    Taxonomic keys are analytical tools used to identify organisms based on contrasting characteristics.
40. Why are taxonomical aids important in biology?
    They provide authentic reference material and help in accurate identification and classification of organisms.

Exam Relevance

✔ Strictly NCERT-aligned
✔ Ideal for 2–3 mark CBSE Class 11 questions
✔ Strong focus on definitions and conceptual clarity
✔ Suitable for school exams and annual assessments