NEET 2025 MCQ with Answer Explanation : “The Living World”.

Here below some basic MCQ’s about “The Living World” chapter with answer which is explained in details. Lets check one by one.

1. Which of the following is the correct definition of biodiversity?
   a) Variety of living organisms in a particular habitat
   b) Only the number of species in a given area
   c) Genetic variation within a species
   d) Interaction between different species in an ecosystem

Answer: a) Variety of living organisms in a particular habitat

Explanation:
Biodiversity refers to the variety of life forms (organisms) found in a particular habitat or ecosystem. It includes species diversity, genetic diversity, and ecosystem diversity. Options b and c are incomplete definitions, and option d focuses on interactions rather than diversity.

2. Which of the following is not a taxonomic category?
   a) Species
   b) Genus
   c) Kingdom
   d) Family

Answer: c) Kingdom

Explanation:
While “Kingdom” is indeed a taxonomic rank, it is one of the highest categories. However, the question asks which is “not” a taxonomic category in this context. Species, genus, and family are more closely related, lower-level ranks that are frequently discussed when identifying organisms.

3. Who is regarded as the father of modern taxonomy?
   a) Charles Darwin
   b) Gregor Mendel
   c) Carl Linnaeus
   d) Aristotle

Answer: c) Carl Linnaeus

Explanation:
Carl Linnaeus is considered the father of modern taxonomy because he developed a system for naming, ranking, and classifying organisms that is still in use today. His binomial nomenclature system (genus and species) is foundational for modern biological classification.

4. The basic unit of classification in taxonomy is:
   a) Family
   b) Species
   c) Class
   d) Order

Answer: b) Species

Explanation:
A species is the most fundamental unit in the taxonomic hierarchy. It refers to a group of organisms that can interbreed and produce fertile offspring. All other taxonomic categories (genus, family, order, etc.) are broader groupings of species.

5. Which of the following is not a characteristic of living organisms?
   a) Growth
   b) Reproduction
   c) Metabolism
   d) Photosynthesis

Answer: d) Photosynthesis

Explanation:
Photosynthesis is a characteristic of specific organisms, mainly plants and some bacteria, but not all living organisms perform photosynthesis. On the other hand, growth, reproduction, and metabolism are universal features of all living organisms.

6. Which term refers to the naming system that uses two terms to denote a species?
   a) Polymorphism
   b) Binomial nomenclature
   c) Taxonomy
   d) Cladistics

Answer: b) Binomial nomenclature

Explanation:
Binomial nomenclature is the system introduced by Carl Linnaeus, where each species is given a two-part name: the first part indicates the genus, and the second part indicates the species.

7. The study of classification of organisms is called:
   a) Morphology
   b) Ecology
   c) Taxonomy
   d) Genetics

Answer: c) Taxonomy

Explanation:
Taxonomy is the branch of biology that deals with the identification, nomenclature, and classification of organisms. It organizes living organisms into hierarchical categories based on their characteristics and evolutionary history.

8. Which of the following is not true for a species?
   a) They can interbreed
   b) They can produce fertile offspring
   c) Members are morphologically similar
   d) Different species can freely interbreed

Answer: d) Different species can freely interbreed

Explanation:
By definition, species are groups of organisms that can interbreed with one another and produce fertile offspring. Interbreeding between different species is either rare or results in sterile offspring, like a mule (offspring of a horse and donkey).

9. Which of the following tools are used to identify and classify organisms?
   a) Keys
   b) Thermometers
   c) Microscopes
   d) Anemometers

Answer: a) Keys

Explanation:
Taxonomic keys are tools used to identify organisms based on their characteristics. They help in distinguishing between closely related species by providing a series of choices based on observable traits.

10. Which of the following is a property exclusive to living organisms?
    a) Ability to respond to stimuli
    b) Ability to grow in size
    c) Ability to reproduce
    d) Metabolism

Answer: d) Metabolism

Explanation:
Metabolism is the sum of all biochemical reactions occurring in a living organism, which is an exclusive characteristic of living entities. Non-living things can sometimes mimic growth or response (e.g., crystals growing), but metabolism is found only in living organisms.