The Living World — NEET Botany MCQs with answers

The Living World is a Class 11 Botany chapter in the NEET (UG) syllabus. NEET720 has 212 reviewed practice questions on it, each with a quick answer and a step-by-step explanation. The 8 questions below are free and fixed, so you can bookmark this page; the full chapter, plus mistake tracking and spaced revision, is in the app.

8 free The Living World practice questions with answers

Choose an answer in your head before opening it. Each explanation says why the correct option is right and, where relevant, why the tempting wrong option is wrong.

1. Question 1 · easy · The Living World

   A textbook prints a plant's scientific name as 'solanum Tuberosum Linn.' Identify the formatting error(s) as per ICBN/ICN binomial nomenclature rules.

   • A.Both genus and species names should be fully capitalised: SOLANUM TUBEROSUM Linn.
   • B.The genus name should start with a capital letter and the species epithet should be entirely in lowercase: Solanum tuberosum Linn.
   • C.The name should not be italicised, only underlined
   • D.The author citation 'Linn.' should not be included at all
   Show answer and explanation

   Answer: B. The genus name should start with a capital letter and the species epithet should be entirely in lowercase: Solanum tuberosum Linn.

   Binomial nomenclature rules require the genus name to begin with a capital letter and the species epithet to be entirely lowercase, both printed in italics (or underlined individually if handwritten); the given name wrongly capitalises 'Tuberosum'.

   As formalised by Linnaeus and followed under ICBN/ICN conventions covered in NCERT, a correctly written binomial has the genus name capitalised and the species epithet in lowercase, e.g. Solanum tuberosum. The given 'solanum Tuberosum' has both errors reversed — genus lowercase, species capitalised — so option B correctly identifies and fixes this. Option A invents a nonexistent all-caps convention. Option D is wrong because including the author's abbreviated name (Linn. for Linnaeus) after the binomial is a valid, common convention, not an error. Option C is a non-issue since both italics and individual underlining are accepted ways to indicate a scientific name is Latin.

   Common mistake: Capitalising the species epithet, especially when it derives from a proper noun-like word (e.g. Tuberosum), which is still written lowercase.

   Key point: Genus = capital first letter; species epithet = entirely lowercase; both italicised or individually underlined.

2. Question 2 · easy · The Living World

   A student claims: 'A taxonomic key always leads to only one possible correct identification and can be used for every unidentified organism regardless of the group it belongs to.' What is wrong with this claim?

   • A.Taxonomic keys are typically prepared separately for each taxonomic group and consist of paired, contrasting statement choices (couplets); using the wrong group-specific key can still mislead identification
   • B.Taxonomic keys eliminate the need for herbaria entirely
   • C.Taxonomic keys are only applicable to fossil specimens
   • D.Taxonomic keys are only used in zoology, never in botany
   Show answer and explanation

   Answer: A. Taxonomic keys are typically prepared separately for each taxonomic group and consist of paired, contrasting statement choices (couplets); using the wrong group-specific key can still mislead identification

   Taxonomic keys are prepared separately for each specific taxonomic group and rely on couplets of contrasting characters; applying a key meant for one group to an organism from a completely different group would not reliably work.

   Taxonomic keys are indeed based on the principle of contrasting character pairs (couplets), and correctly applied within their intended taxonomic group they usually lead to accurate identification. However, the claim overreaches by implying universal applicability across ALL groups regardless of the specific key's scope — in practice, keys are compiled for defined taxonomic groups (e.g. a key for flowering plant families, a separate key for insect orders), so a botanical key cannot be validly used to identify, say, a fungus or an animal. This is the core flaw in the statement. The other options misdirect toward unrelated or overstated claims about taxonomic aids.

   Common mistake: Believing one universal key exists for identifying any organism, rather than group-specific keys.

   Key point: Taxonomic keys are group-specific tools built on couplets of contrasting characters, not universally applicable across all organisms.

3. Question 3 · easy · The Living World

   Carl Woese's three-domain system separates living organisms into Archaea, Bacteria, and Eukarya. On which basis did Woese make this separation, distinguishing it from Whittaker's five kingdom system that grouped all prokaryotes together in a single kingdom Monera?

   • A.Differences in mode of nutrition, i.e., autotrophic versus heterotrophic organisms
   • B.Differences in ribosomal RNA (rRNA) sequences, cell membrane lipid composition, and sensitivity to antibiotics
   • C.Presence or absence of a cell wall around the cell
   • D.Whether reproduction is sexual or asexual
   Show answer and explanation

   Answer: B. Differences in ribosomal RNA (rRNA) sequences, cell membrane lipid composition, and sensitivity to antibiotics

   Woese used rRNA sequence comparisons, distinct membrane lipids, and differing antibiotic sensitivity to show archaebacteria are as distinct from eubacteria as either is from eukaryotes, justifying separate domains rather than one kingdom Monera.

   Whittaker's 1969 five kingdom system (Monera, Protista, Fungi, Plantae, Animalia) grouped all prokaryotes into Monera based mainly on cell structure (absence of a membrane-bound nucleus). Woese (1977, formalised as three domains in 1990) compared small-subunit rRNA gene sequences and found archaebacteria to be molecularly as different from eubacteria as from eukaryotes; archaea also have unique ether-linked membrane lipids and lack sensitivity to many antibiotics that affect eubacteria. This molecular and biochemical evidence, not nutrition, wall presence, or reproduction, justified splitting prokaryotes into two domains (Archaea and Bacteria) alongside Eukarya.

   Common mistake: Assuming Woese simply renamed Whittaker's kingdoms rather than using new molecular criteria to redraw prokaryotic boundaries.

   Key point: Three domains (Archaea, Bacteria, Eukarya) rest on rRNA sequence, membrane lipid, and antibiotic-sensitivity differences, not on structural or nutritional traits.

4. Question 4 · medium · The Living World

   A sunflower seedling bends its shoot tip towards a window over several hours; a light-tracking robot toy turns towards the same light within a second. NEET biology treats only the seedling's response as evidence of consciousness. What is the most defensible reason?

   • A.The seedling's response is generated by living, metabolising tissue sensing a stimulus, whereas the robot's turn is a pre-programmed electronic output with no metabolism
   • B.The seedling moves more slowly, and slow responses are always classified as conscious
   • C.Only organisms with a nervous system can sense and respond, so the seedling's bending must involve one
   • D.The robot lacks consciousness only because it is man-made, regardless of how it processes the stimulus
   Show answer and explanation

   Answer: A. The seedling's response is generated by living, metabolising tissue sensing a stimulus, whereas the robot's turn is a pre-programmed electronic output with no metabolism

   Consciousness in biology means sensing and responding through a living, metabolically active system, not merely producing a stimulus-linked output.

   NCERT treats the ability to sense the environment and respond as the unique, all-pervasive property of life. What matters is that a living, metabolising organism performs the sensing and response, not the speed or apparent complexity of that response. A robot's turn, however fast, is engineered circuitry with no underlying life process. Plants sense and respond without a nervous system, so option C's assumption is false; speed (B) and origin (D) are not the biological criteria used.

   Common mistake: Assuming any stimulus-response behaviour, including a machine's, counts as consciousness.

   Key point: Sensing and responding via a living, metabolising system defines biological consciousness, not response speed.

5. Question 5 · easy · The Living World

   A stalactite in a cave enlarges over centuries by mineral deposition on its surface, while a banyan tree increases in girth through cell division from within. How does NCERT distinguish these two kinds of 'growth'?

   • A.The stalactite grows only because of water exposure, while trees grow only without water
   • B.The stalactite's growth is extrinsic (surface deposition); the tree's growth is intrinsic, from within, by increase in cell number
   • C.Both count equally as living growth since mass increases in each case
   • D.The tree's growth is extrinsic because branches are added externally, like the stalactite's layers
   Show answer and explanation

   Answer: B. The stalactite's growth is extrinsic (surface deposition); the tree's growth is intrinsic, from within, by increase in cell number

   Living growth is intrinsic, from an increase in cell number/size; a stalactite's growth is extrinsic, by surface accretion of material.

   NCERT notes non-living objects such as mountains and stalactites can also 'grow' by external deposition, but living growth is intrinsic, arising from cell division and enlargement within the organism, generally linked to metabolism. Growth alone is therefore not a sufficient marker of life unless it is this intrinsic, cellular kind.

   Common mistake: Treating any size/mass increase as biological growth.

   Key point: Growth defines life only when intrinsic (cellular), not mere external accretion.

6. Question 6 · medium · The Living World

   Isolated cell-free enzyme extracts can carry out a biochemical reaction in a test tube identical to one occurring inside a living cell. According to NCERT, what does this imply about metabolism as a defining feature of life?

   • A.Any biochemical reaction happening anywhere, inside or outside a cell, must be classified as alive
   • B.Cell-free extracts prove that metabolism cannot occur without an intact, membrane-bound cell
   • C.Metabolism, as a sum of chemical reactions, can be demonstrated outside the body in cell-free systems, yet such isolated reactions are not living by themselves
   • D.Since the reaction is identical, the test tube itself becomes a living entity
   Show answer and explanation

   Answer: C. Metabolism, as a sum of chemical reactions, can be demonstrated outside the body in cell-free systems, yet such isolated reactions are not living by themselves

   Individual metabolic reactions can be reproduced in vitro, but isolated reactions are non-living; metabolism is 'living' only as an organised, integrated whole within an organism.

   NCERT points out that all metabolic reactions demonstrable in living systems can be carried out in isolated, cell-free systems outside the body. However, no chemical reaction taking place in isolation outside the cell is itself living. This shows that metabolism (in isolation) is a unique, defining feature only when it operates as an organised, integrated whole inside a living organism, not simply because a similar reaction can occur in vitro.

   Common mistake: Assuming any biochemical reaction, wherever it occurs, is proof of life.

   Key point: An isolated metabolic reaction in vitro is not alive; life needs the integrated whole.

7. Question 7 · medium · The Living World

   Statement I: A mule (offspring of a horse and donkey) is sterile and cannot reproduce, yet it is unquestionably a living organism. Statement II: Reproduction is therefore not treated as an absolutely defining feature applicable to every individual organism. Choose the correct option.

   • A.Statement I is true but Statement II is false
   • B.Statement I is false but Statement II is true
   • C.Both statements are false
   • D.Both statements are true and Statement II correctly follows from Statement I
   Show answer and explanation

   Answer: D. Both statements are true and Statement II correctly follows from Statement I

   Sterile organisms like mules or worker bees are alive but cannot reproduce, so reproduction is not a universal criterion applicable to every single organism.

   NCERT explicitly notes that reproduction cannot be an all-inclusive defining property of life because many living organisms (mules, sterile worker bees and ants) do not reproduce at all. Statement I gives a correct, factual example; Statement II is the correct generalisation NCERT draws from such cases, making both true with II following from I.

   Common mistake: Assuming every living organism must be capable of reproducing.

   Key point: Sterile organisms (mules, worker bees) are living but non-reproductive, so reproduction alone cannot define life.

8. Question 8 · easy · The Living World

   Which of the following is correctly identified by NCERT as a defining feature of living organisms, distinguishing them structurally from non-living matter?

   • A.Cellular organisation of the body
   • B.Presence of carbon and hydrogen atoms
   • C.Ability to dissolve in water
   • D.Fixed, unchanging chemical composition throughout life
   Show answer and explanation

   Answer: A. Cellular organisation of the body

   NCERT lists cellular organisation of the body as a defining feature of living organisms, alongside metabolism, growth, reproduction, response, and consciousness.

   All living organisms, whether unicellular or multicellular, are organised at the cellular level, with the cell as the basic structural and functional unit. This is a defining structural feature distinguishing life from non-living matter, unlike the other options which describe generic chemical properties shared with non-living substances.

   Common mistake: Confusing general chemical composition with a biological defining feature.

   Key point: Cellular organisation is a core defining structural feature of life.

Questions about The Living World for NEET

More Botany chapters

← Anatomy of Flowering PlantsAll Botany chaptersDiversity in Living World →

Questions are original NEET720 compositions reviewed for correctness, syllabus fit and option quality. Counts update as the bank grows (212 active practice questions in this chapter today).