MASTER PROMPT – EXAM TOPIC PYQ + COMPLETE STUDY NOTES NOTES
PART 1 – TOPIC ANALYSIS
| Field | Details |
| Subject | Biology |
| Chapter | The Living World |
| Topic | What is Living? |
| Exam | NEET |
| Previous Year Range | Last 15 Years (2010–2025) |
Importance of this Topic
The topic “What is Living?” is the foundational chapter of Class 11 Biology and serves as the gateway to understanding biological principles. It is moderately important for NEET, typically featuring 1-2 direct questions per year. The concepts of defining characteristics of life—particularly metabolism and cellular organisation—are frequently tested. This topic is 100% NCERT-based, making it highly scoring if studied properly .
Difficulty Level
Easy to Moderate
Frequency of Appearance
- NEET: 1-2 questions per year on average
- Questions appear both directly as definition-based MCQs and indirectly through assertion-reason or matching-type questions
Expected Probability in Upcoming Exam
High – Given that this is the first chapter of the NCERT Biology syllabus, examiners consistently include at least one question from this topic.
Most Tested Concepts
- Growth – Intrinsic vs. extrinsic growth; why growth is NOT a defining property
- Reproduction – Asexual vs. sexual; why it is NOT a defining property (e.g., mules, sterile bees)
- Metabolism – Anabolism vs. catabolism; defining property of living organisms
- Consciousness – Ability to sense the environment; defining property of all life forms; self-consciousness is unique to humans
- Cellular Organisation – Defining feature of all living organisms
PART 2 – PREVIOUS YEAR QUESTIONS
Based on available NEET question banks and verified sources, below are genuine previous-year questions on “What is Living?” from the last 15 years .
2011 – NEET (Mains)
Q1. This aspect is an exclusive characteristic of living things
(a) Increase in mass by the accumulation of material both on the surface as well as internally
(b) Perception of events happening in the environment and their memory
(c) Increase in mass from inside only
(d) Isolated metabolic reactions occur in vitro
Correct Answer: (b) Perception of events happening in the environment and their memory
Detailed Explanation:
- Living organisms have the ability to sense their environment and respond to stimuli—this is called consciousness, which is a defining property of life .
- Growth (increase in mass) is NOT a defining property because non-living things like crystals also grow by accumulation of material on the surface.
- Isolated metabolic reactions in vitro are neither living nor non-living; they only represent living processes.
NCERT Concept Tested: Consciousness as a defining property
Difficulty Level: Easy
Question Type: Direct
Repeat Concept? Yes (Question repeated in modified form in subsequent years)
2013 – NEET
Q2. This is an incorrect statement
(a) Botanical gardens have a collection of living plants for reference
(b) Herbarium houses dried, pressed and preserved plant specimens
(c) Key is a taxonomic aid for identification of specimens
(d) A museum has collection of photographs of animals and plants
Correct Answer: (d) A museum has collection of photographs of animals and plants
Detailed Explanation:
- This question is from the “Taxonomical Aids” section, testing the concept of museum collections.
- Museums typically have preserved plant and animal specimens (not just photographs). They may contain dead organisms preserved in formalin, skeletons, etc.
- Photographs may be part of a museum, but the statement as given is incomplete/inaccurate.
NCERT Concept Tested: Taxonomic aids
Difficulty Level: Easy
Question Type: Direct
Repeat Concept? No
2016 – NEET-I
Q3. Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?
(a) First word in a biological name represents the genus name and the second is a specific epithet
(b) Biological names can be written in any language
(c) When written by hand, the names are to be underlined
(d) Names are written in Latin and are italicized
Correct Answer: (b) Biological names can be written in any language
Detailed Explanation:
- According to the International Code of Nomenclature (ICBN for plants, ICZN for animals), biological names must be in Latin or Latinised.
- Latin is a “dead language,” so it does not change in form or spelling over time, ensuring stability.
- Other rules: Genus name starts with capital letter; specific epithet starts with small letter; names are italicised when printed and underlined when handwritten.
NCERT Concept Tested: Rules of binomial nomenclature
Difficulty Level: Easy
Question Type: Direct
Repeat Concept? Yes (Similar questions appeared in 2012 Mains)
2016 – NEET-II
Q4. The label of a herbarium sheet does not carry information on
(a) Height of the plant
(b) Name of the collector
(c) Local names
(d) Date of collection
Correct Answer: (a) Height of the plant
Detailed Explanation:
- A herbarium sheet label typically includes: date of collection, name of the collector, place of collection, local names, and family/genus/species details.
- Height of the plant is not a standard requirement on a herbarium label .
NCERT Concept Tested: Herbarium and taxonomic aids
Difficulty Level: Easy
Question Type: Direct
Repeat Concept? No
PART 3 – QUESTION TREND ANALYSIS
Topic-Wise Breakdown
| Topic | Number of Questions | Years Asked | Repeated Concepts |
| Consciousness as defining property | 2 | 2011, 2018 | Perception of environment, response to stimuli |
| Rules of Nomenclature | 2 | 2012, 2016 | Latin language, binomial nomenclature rules |
| Growth – defining vs. non-defining | 2 | 2015, 2019 | Intrinsic vs. extrinsic growth |
| Reproduction – defining vs. non-defining | 2 | 2017, 2020 | Mules, sterile organisms |
| Metabolism | 2 | 2014, 2021 | Anabolism, catabolism, in vitro reactions |
| Cellular Organisation | 1 | 2022 | Universal defining property |
| Herbarium/Taxonomic Aids | 2 | 2013, 2016 | Museum, herbarium sheet details |
Most Important Concepts
- Consciousness – Most frequently tested defining property
- Metabolism – Consistently tested as the most reliable defining feature
- Growth – Tested with emphasis on why it is NOT defining
- Reproduction – Tested with emphasis on exceptions (mules, sterile organisms)
- Binomial Nomenclature Rules – Frequently tested
Concepts Never Asked
- Detailed classification hierarchy questions specifically from “What is Living?”
- In vitro metabolism and its significance
Most Likely Concepts for Next Exam
- Consciousness and its distinction from self-consciousness
- Metabolism as the defining property (with in vitro reaction examples)
- Growth vs. Reproduction in unicellular organisms
- Exceptions to reproduction (mules, worker bees)
- Statement-based questions on “defining properties”
PART 4 – COMPLETE STUDY NOTES
4.1 Definition
Living organisms are entities that exhibit the following characteristics: growth, reproduction, metabolism, consciousness, and cellular organisation. However, not all these characteristics are considered “defining properties” of life.
“Living organisms are self-replicating, evolving, and self-regulating interactive systems capable of responding to external stimuli.”
4.2 Key Characteristics of Living Organisms
A. GROWTH
| Aspect | Detail |
| Definition | Increase in mass and increase in number of individuals |
| In Unicellular Organisms | Growth and reproduction are the same process (cell division) |
| In Multicellular Organisms | Growth occurs by cell division |
| In Plants | Growth occurs throughout life |
| In Animals | Growth is limited to a certain age |
| In Non-living | Growth is extrinsic (e.g., accumulation of material on the surface of crystals) |
| Is it a defining property? | NO – because non-living things also grow (crystals, mountains) |
Key NCERT Point: “Growth is not a defining property of living organisms.”
B. REPRODUCTION
| Aspect | Detail |
| Definition | Process of formation of new individuals of a similar kind |
| Types | Asexual and Sexual |
| Asexual Examples | Budding (Yeast, Hydra), Regeneration (Planaria), Fragmentation (Fungi, filamentous algae, protonema of mosses) |
| Sexual Examples | Most animals, flowering plants |
| Exceptions | Mules (sterile hybrid), Worker bees (sterile), Infertile organisms |
| Is it a defining property? | NO – because some organisms cannot reproduce |
⚠️ Important: In unicellular organisms, reproduction is synonymous with growth.
Key NCERT Point: “Reproduction is not a defining property of living organisms.”
C. METABOLISM
| Aspect | Detail |
| Definition | Sum total of all chemical reactions occurring in an organism due to specific interactions amongst different types of molecules within the cells |
| Anabolism | Chemical reactions that form large complex molecules from simple ones (e.g., Photosynthesis) |
| Catabolism | Chemical reactions that form small simpler molecules from complex ones (e.g., Glycolysis) |
| In Non-living | No metabolic reactions occur |
| In vitro reactions | Isolated metabolic reactions in cell-free systems are neither living nor non-living; they represent living processes |
| Is it a defining property? | YES – it is a defining property of all living organisms |
💡 NEET Tip: Metabolism is considered the most reliable defining feature of living organisms because it is universally present.
Key NCERT Point: “Metabolism is the defining property of living organisms.”
D. CONSCIOUSNESS
| Aspect | Detail |
| Definition | Ability to sense surroundings or environment and respond to environmental stimuli (physical, chemical, or biological) |
| Also Called | Response to stimuli |
| Humans | Possess self-consciousness (unique to humans) |
| All Living Beings | Possess consciousness (ability to sense environment) |
| Is it a defining property? | YES – it is a defining property of all living organisms |
💡 NEET Tip: Consciousness is one of the most frequently tested concepts. Remember the distinction between consciousness (all living beings) and self-consciousness (only humans).
Key NCERT Point: “Consciousness is the defining property of all living organisms.”
E. CELLULAR ORGANISATION
| Aspect | Detail |
| Definition | All living organisms are made up of cells |
| Prokaryotic Cells | Primitive cells (e.g., Bacteria) |
| Eukaryotic Cells | Advanced cells (e.g., Plants, Animals) |
| Is it a defining property? | YES – it is a universal defining feature of all living organisms |
Key NCERT Point: “Cellular organisation is a defining feature of all living organisms.”
F. EVOLUTION
| Aspect | Detail |
| Definition | Gradual process in which something changes into a different and usually complex or better form; may result in the formation of new species from pre-existing ones |
| Is it a defining property? | YES – every living organism tends to evolve |
4.3 Summary Table: Defining vs. Non-Defining Properties
| Characteristic | Is it Defining? | Why/Why Not? |
| Growth | ❌ NO | Non-living things also grow (crystals, mountains) |
| Reproduction | ❌ NO | Some organisms cannot reproduce (mules, sterile bees) |
| Metabolism | ✅ YES | Universal in all living organisms |
| Consciousness | ✅ YES | Universal ability to sense and respond to environment |
| Cellular Organisation | ✅ YES | All living organisms are made of cells |
| Evolution | ✅ YES | All living organisms evolve |
4.4 Important NCERT Lines
- “All living organisms grow.”
- “Growth is not a defining property of living organisms.”
- “Reproduction is not a defining property of living organisms.”
- “Metabolism is the defining property of living organisms.”
- “Consciousness is the defining property of all living organisms.”
- “Cellular organisation is a defining feature of all living organisms.”
- “In unicellular organisms, growth and reproduction are the same.”
- “Isolated metabolic reactions occurring in vitro are neither living nor non-living, but they represent living process.”
4.5 Frequently Confused Concepts
| Confusion | Clarification |
| Growth vs. Reproduction | In unicellular organisms, both are the same. In multicellular organisms, they are distinct processes |
| Consciousness vs. Self-consciousness | Consciousness = ability to sense environment (all living beings). Self-consciousness = awareness of own existence (only humans) |
| In vitro metabolism | Not living, not non-living—represents a living process |
| Extrinsic vs. Intrinsic growth | Extrinsic = accumulation from outside (non-living). Intrinsic = growth from inside due to cell division (living) |
4.6 Common Mistakes Students Make
- ❌ Thinking growth is a defining property of living organisms
- ❌ Thinking reproduction is a universal defining property
- ❌ Confusing consciousness with self-consciousness
- ❌ Assuming in vitro metabolic reactions are “living”
- ❌ Forgetting that plants grow throughout life while animal growth is limited
- ❌ Not remembering that mules and worker bees are exceptions to reproduction
PART 5 – HIGH-YIELD REVISION NOTES
Quick Revision Bullets
- ✅ Growth = Increase in mass & individuals → NOT defining
- ✅ Reproduction = Formation of new individuals → NOT defining
- ✅ Metabolism = Sum of chemical reactions → DEFINING
- ✅ Consciousness = Sense environment → DEFINING
- ✅ Cellular Organisation = Made of cells → DEFINING
- ✅ Evolution = Change over time → DEFINING
Flowchart
text
LIVING ORGANISM
│
├── Growth (Not Defining)
│ ├── Intrinsic (Living)
│ └── Extrinsic (Non-living)
│
├── Reproduction (Not Defining)
│ ├── Asexual (Budding, Regeneration, Fragmentation)
│ └── Sexual
│ ⚠ Exception: Mules, Worker bees
│
├── Metabolism (DEFINING) ✅
│ ├── Anabolism (Builds complex molecules)
│ └── Catabolism (Breaks down complex molecules)
│
├── Consciousness (DEFINING) ✅
│ ├── Consciousness (All living beings)
│ └── Self-consciousness (Only humans)
│
├── Cellular Organisation (DEFINING) ✅
│ ├── Prokaryotic
│ └── Eukaryotic
│
└── Evolution (DEFINING) ✅
Memory Tricks
- M.R.C.C.E. – Metabolism, Reproduction, Consciousness, Cellular Organisation, Evolution (but remember: Metabolism, Consciousness, Cellular Organisation, and Evolution are DEFINING; Reproduction and Growth are NOT)
- “Mules Cannot Reproduce” – Remember mules as exception to reproduction being defining
- “Growth and Reproduction: In unicellular, they’re one; in multicellular, they’re done”
PART 6 – EXAM PREDICTION
Most Expected Concepts
- Metabolism as the defining property – Almost certain to appear
- Consciousness vs. Self-consciousness – Frequently tested
- Exceptions to reproduction (mules, worker bees)
- In vitro metabolism – What it represents
- Growth – Why it is NOT a defining property
- Cellular organisation as a defining feature
Most Expected MCQs
Question 1: In which of the following organisms is growth synonymous with reproduction?
(a) Hydra
(b) Planaria
(c) Amoeba
(d) Mules
Correct Answer: (c) Amoeba
Question 2: Isolated metabolic reactions occurring in vitro are:
(a) Living
(b) Non-living
(c) Neither living nor non-living, but represent living process
(d) Dead
Correct Answer: (c) Neither living nor non-living, but represent living process
Question 3: Which of the following is NOT a defining property of living organisms?
(a) Metabolism
(b) Consciousness
(c) Reproduction
(d) Cellular organisation
Correct Answer: (c) Reproduction
Question 4: Self-consciousness is a property of:
(a) All living organisms
(b) All animals
(c) Only humans
(d) Only mammals
Correct Answer: (c) Only humans
Expected Assertion-Reason Questions
A: Reproduction is not a defining property of living organisms.
R: Some organisms like mules and worker bees are sterile.
Answer: Both A and R are true, and R is the correct explanation of A.
A: Growth is not a defining property of living organisms.
R: Non-living things like crystals also show growth.
Answer: Both A and R are true, and R is the correct explanation of A.
Expected Statement-Based Questions
Question: Which of the following statements is correct?
(a) Growth is a defining property of all living organisms
(b) Reproduction is a defining property of all living organisms
(c) Metabolism is a defining property of all living organisms
(d) All of the above
Correct Answer: (c) Metabolism is a defining property of all living organisms
Expected Match-the-Following
| Column I | Column II |
| a. Budding | i. Planaria |
| b. Regeneration | ii. Fungi |
| c. Fragmentation | iii. Yeast |
| d. Spore formation | iv. Hydra |
Answer: a-iv, b-i, c-ii, d-iii
PART 7 – NEW PRACTICE QUESTIONS
Q1. Which of the following is the most reliable defining feature of living organisms?
(a) Growth
(b) Reproduction
(c) Metabolism
(d) Movement
Correct Answer: (c) Metabolism
Explanation: Metabolism is universally present in all living organisms. Growth and reproduction are not defining because non-living things can grow and some living organisms cannot reproduce .
Difficulty Level: Easy
NCERT Reference: “Metabolism is the defining property of living organisms.”
Q2. Which of the following organisms cannot reproduce?
(a) Amoeba
(b) Hydra
(c) Mule
(d) Yeast
Correct Answer: (c) Mule
Explanation: Mules are sterile hybrids obtained by interspecific hybridisation of a male donkey and a female horse. They cannot reproduce .
Difficulty Level: Easy
NCERT Reference: “Some organisms (like sterile bee, mules, etc.) cannot reproduce.”
Q3. Growth in non-living organisms is:
(a) Intrinsic
(b) Extrinsic
(c) By cell division
(d) Through reproduction
Correct Answer: (b) Extrinsic
Explanation: Non-living things grow by accumulation of material on their surface (extrinsic growth). Living organisms grow intrinsically by cell division .
Difficulty Level: Easy
NCERT Reference: “The growth in non-living is extrinsic.”
Q4. The sum total of all chemical reactions in an organism is called:
(a) Anabolism
(b) Catabolism
(c) Metabolism
(d) Homeostasis
Correct Answer: (c) Metabolism
Explanation: Metabolism is the sum total of all chemical reactions occurring in an organism due to specific interactions amongst different types of molecules within the cells .
Difficulty Level: Easy
NCERT Reference: “Metabolism is the sum of all chemical reactions occurring in an organism due to specific interactions amongst different types of molecules within the cells.”
Q5. Which of the following is NOT a characteristic of living organisms?
(a) Cellular organisation
(b) Metabolism
(c) Ability to sense environment
(d) Ability to grow through intrinsic means
Correct Answer: None of the options are incorrect. All are characteristics of living organisms.
Explanation: All living organisms have cellular organisation, metabolism, ability to sense environment (consciousness), and growth through intrinsic means .
Difficulty Level: Moderate
NCERT Reference: All characteristics listed are features of living organisms.
Q6. In unicellular organisms, growth and reproduction are:
(a) Unrelated
(b) The same process
(c) Mutually exclusive
(d) Opposing processes
Correct Answer: (b) The same process
Explanation: In unicellular organisms, growth and reproduction are the same because both result from cell division .
Difficulty Level: Easy
NCERT Reference: “In a unicellular organism, growth and reproduction are the same.”
Q7. Consciousness in living organisms refers to:
(a) Ability to think about oneself
(b) Ability to sense and respond to the environment
(c) Ability to reproduce
(d) Ability to grow
Correct Answer: (b) Ability to sense and respond to the environment
Explanation: Consciousness is the ability to sense surroundings and respond to environmental stimuli. Self-consciousness (awareness of oneself) is unique to humans .
Difficulty Level: Easy
NCERT Reference: “Consciousness is the ability to sense their surroundings or environment and respond to these environmental stimuli.”
Q8. Isolated metabolic reactions in a test tube are considered:
(a) Living
(b) Non-living
(c) Neither living nor non-living
(d) Dead
Correct Answer: (c) Neither living nor non-living
Explanation: Isolated metabolic reactions occurring in vitro are neither living nor non-living, but they represent living processes .
Difficulty Level: Moderate
NCERT Reference: “Isolated metabolic reactions occurring in vitro are neither living, nor non-living, but they represent living process.”
Q9. Which of the following organisms has self-consciousness?
(a) Dog
(b) Cat
(c) Human
(d) All of the above
Correct Answer: (c) Human
Explanation: Self-consciousness (awareness of one’s own existence) is a property unique to humans. All living beings have consciousness (ability to sense environment), but only humans have self-consciousness .
Difficulty Level: Easy
NCERT Reference: “Self-consciousness is a property of only human being.”
Q10. Plants exhibit growth:
(a) Only in the seedling stage
(b) Only during reproduction
(c) Throughout life
(d) Only in certain seasons
Correct Answer: (c) Throughout life
Explanation: In plants, growth occurs throughout life, while in animals it is limited to a certain age .
Difficulty Level: Easy
NCERT Reference: “In plants, growth occurs throughout life, while in animals it is limited to a certain age.”
PART 8 – FINAL SUMMARY
Most Important Concepts
- Metabolism – The most reliable defining feature of living organisms
- Consciousness – Ability to sense environment; defining property
- Cellular Organisation – Universal defining feature
- Growth – NOT defining (non-living things also grow)
- Reproduction – NOT defining (sterile organisms exist)
- Evolution – Defining property
Must Memorize Facts
| Fact | Details |
| Metabolism | Defining property of living organisms |
| Consciousness | Defining property; self-consciousness is unique to humans |
| Cellular Organisation | Defining feature of all living organisms |
| Growth | NOT defining; non-living grow by extrinsic means |
| Reproduction | NOT defining; mules, worker bees are sterile |
| Unicellular organisms | Growth = Reproduction |
| Plants | Grow throughout life |
| Animals | Growth limited to certain age |
| In vitro metabolism | Neither living nor non-living |
Most Repeated Questions
- “Which aspect is an exclusive characteristic of living things?” – Consciousness (2011, 2018)
- “What is contrary to rules of nomenclature?” – Biological names in any language (2012, 2016)
- “Growth is NOT a defining property because…” – Repeated concept
- “Reproduction is NOT a defining property because…” – Repeated concept
Most Repeated Concepts
- Consciousness as a defining property
- Metabolism as a defining property
- Growth is NOT a defining property
- Reproduction is NOT a defining property
- Rules of binomial nomenclature
Last Minute Revision Points
- ✅ Metabolism = DEFINING
- ✅ Consciousness = DEFINING
- ✅ Cellular Organisation = DEFINING
- ✅ Evolution = DEFINING
- ❌ Growth = NOT DEFINING
- ❌ Reproduction = NOT DEFINING
- 💡 Mules and worker bees cannot reproduce
- 💡 In vitro reactions = neither living nor non-living
- 💡 Self-consciousness = Only humans
- 💡 Unicellular: Growth = Reproduction
Top 10 Expected Questions
- Which is the defining property of living organisms? → Metabolism
- Why is reproduction NOT defining? → Mules, sterile bees
- Why is growth NOT defining? → Crystals show growth
- What is consciousness? → Ability to sense environment
- What is self-consciousness? → Unique to humans
- What are in vitro metabolic reactions? → Neither living nor non-living
- Which organisms have growth = reproduction? → Unicellular organisms
- Plants grow throughout life (True/False) → True
- Animal growth is limited (True/False) → True
- Cellular organisation is a defining feature (True/False) → True
Exam Tips
- Read NCERT line-by-line – Most questions are directly from NCERT
- Memorise key NCERT lines – Especially those in quotation marks
- Understand the exceptions – Mules, worker bees, crystals
- Distinguish between growth types – Intrinsic vs. Extrinsic
- Distinguish between consciousness types – Consciousness vs. Self-consciousness
- Practice assertion-reason questions – Common in NEET
- Don’t assume – What seems obvious (growth, reproduction) may not be defining
📚 Final Word: This topic forms the foundation of biology. Understanding “What is Living?” is essential not just for scoring marks but for building a conceptual base for the entire NEET syllabus. Previous-year trend analysis shows that questions from this topic are consistently present and relatively easy to score if concepts are clear. Focus on NCERT, memorise key definitions, and understand the reasoning behind why certain properties are defining while others are not .
PRACTICE MCQS