What is Living?
1. The most unique feature of living organisms is:
A. Growth
B. Reproduction
C. Consciousness
D. Metabolism
✅ Answer: C. Consciousness
2. Which property is not considered as a defining property of life?
A. Reproduction
B. Consciousness
C. Metabolism
D. Cellular organization
✅ Answer: A. Reproduction
3. Viruses are considered living because they:
A. Possess DNA or RNA
B. Show metabolism outside host
C. Reproduce inside a host
D. Are made up of proteins only
✅ Answer: C. Reproduce inside a host
4. Which of the following is true for both plants and animals?
A. Growth is by cell division
B. Growth occurs throughout life
C. Growth is by deposition of material
D. Both show movement visible to naked eye
✅ Answer: A. Growth is by cell division
5. In unicellular organisms, growth is linked to:
A. Size of the organism
B. Cell division → reproduction
C. Differentiation
D. Cell aging
✅ Answer: B. Cell division → reproduction
6. Which process is the sum of anabolism and catabolism?
A. Respiration
B. Photosynthesis
C. Metabolism
D. Homeostasis
✅ Answer: C. Metabolism
7. Which one is NOT a living organism?
A. Virus
B. Mycoplasma
C. Bacteriophage
D. Prion
✅ Answer: D. Prion
8. Which of the following is a non-cellular organism?
A. Mycoplasma
B. Bacteriophage
C. Virus
D. Viroid
✅ Answer: C. Virus
9. Which of the following cannot reproduce?
A. Mule
B. Virus (inside host)
C. Amoeba
D. Paramecium
✅ Answer: A. Mule
10. Which of the following is true for metabolism?
A. Occurs only in multicellular organisms
B. Can be demonstrated in cell-free systems
C. Does not occur in plants
D. Is a non-defining property
✅ Answer: B. Can be demonstrated in cell-free systems
11. Which characteristic is present in all living organisms without exception?
A. Growth
B. Reproduction
C. Metabolism
D. Consciousness
✅ Answer: C. Metabolism
12. Homeostasis refers to:
A. Constant external environment
B. Maintaining a constant internal environment
C. Constant reproduction
D. Constant growth
✅ Answer: B. Maintaining a constant internal environment
13. Which of the following shows metabolism only inside host?
A. Bacteria
B. Virus
C. Mycoplasma
D. Algae
✅ Answer: B. Virus
14. Which one is the smallest living cell known?
A. Virus
B. Mycoplasma
C. Bacterium
D. Viroid
✅ Answer: B. Mycoplasma
15. The term “living state” refers to:
A. Presence of DNA only
B. Metabolism within a cell
C. Growth and movement
D. Reproduction alone
✅ Answer: B. Metabolism within a cell
16. A unique feature of humans compared to other organisms is:
A. Growth
B. Metabolism
C. Reproduction
D. Self-consciousness
✅ Answer: D. Self-consciousness
17. Which of the following shows living as well as non-living features?
A. Algae
B. Fungus
C. Virus
D. Bacteria
✅ Answer: C. Virus
18. The term “systematic biology” deals with:
A. Ecology only
B. Classification and evolution
C. Anatomy
D. Biochemistry
✅ Answer: B. Classification and evolution
19. Which is NOT a part of metabolism?
A. Anabolism
B. Catabolism
C. Reproduction
D. Energy transformation
✅ Answer: C. Reproduction
20. Which of the following demonstrates metabolism outside the body?
A. Growth in plants
B. Isolated enzyme catalyzed reaction in test tube
C. Virus inside host
D. Mule
✅ Answer: B. Isolated enzyme catalyzed reaction in test tube
21. Which of the following is considered the basic unit of life?
A. DNA
B. Cell
C. Gene
D. Protein
✅ Answer: B. Cell
22. Which of the following statements is true about viruses?
A. They are cellular but non-living
B. They are acellular and show both living & non-living features
C. They are cellular and living
D. They have metabolism outside host
✅ Answer: B. They are acellular and show both living & non-living features
23. Which characteristic of life is most directly related to evolution?
A. Growth
B. Reproduction
C. Consciousness
D. Metabolism
✅ Answer: B. Reproduction
24. Which of the following is a non-living infectious agent consisting of only RNA?
A. Virus
B. Viroid
C. Prion
D. Bacteriophage
✅ Answer: B. Viroid
25. Which of the following is an example of living organisms without a true nucleus?
A. Virus
B. Bacteria
C. Fungi
D. Protozoa
✅ Answer: B. Bacteria
26. Which of the following is NOT an example of living property?
A. Cellular organization
B. Response to stimuli
C. Crystallization
D. Metabolism
✅ Answer: C. Crystallization
27. Which one of the following cannot be considered a defining feature of living organisms?
A. Response to stimuli
B. Consciousness
C. Growth in body mass due to deposition of material
D. Metabolism
✅ Answer: C. Growth in body mass due to deposition of material
28. Which property is common to both living and non-living?
A. Growth
B. Consciousness
C. Reproduction
D. Metabolism
✅ Answer: A. Growth (e.g., crystal growth)
29. Mule is considered living because it shows:
A. Reproduction
B. Metabolism and other life processes
C. Growth only
D. Consciousness alone
✅ Answer: B. Metabolism and other life processes
30. “Living organisms are self-replicating, evolving, and self-regulating interactive systems.” This definition was given by:
A. Ernst Mayr
B. Aristotle
C. M.J. Schleiden
D. Theodosius Dobzhansky
✅ Answer: A. Ernst Mayr
31. Which of the following is not true about consciousness?
A. It is a defining property of life
B. It is absent in prokaryotes
C. Plants also respond to stimuli
D. Humans show self-consciousness
✅ Answer: B. It is absent in prokaryotes
32. The most abundant chemical in living organisms is:
A. Carbohydrate
B. Protein
C. Water
D. Lipid
✅ Answer: C. Water
33. In unicellular organisms, growth is equivalent to:
A. Development
B. Reproduction
C. Metabolism
D. Aging
✅ Answer: B. Reproduction
34. Which of the following does NOT reproduce?
A. Bacteria
B. Viruses (inside host)
C. Fungi
D. Worker bees
✅ Answer: D. Worker bees
35. Which property clearly differentiates prokaryotic cells from viruses?
A. Possession of DNA
B. Ability to reproduce independently
C. Presence of proteins
D. Lack of organelles
✅ Answer: B. Ability to reproduce independently
36. Which of the following is considered a non-cellular living organism?
A. Mycoplasma
B. Virus
C. Bacterium
D. Fungi
✅ Answer: B. Virus
37. Which term refers to the totality of life forms on Earth?
A. Ecology
B. Ecosystem
C. Biosphere
D. Environment
✅ Answer: C. Biosphere
38. Which is considered the smallest infectious agent?
A. Virus
B. Viroid
C. Prion
D. Bacteriophage
✅ Answer: C. Prion
39. Which of the following features is NOT shared by both plants and animals?
A. Growth
B. Metabolism
C. Reproduction
D. Autotrophy
✅ Answer: D. Autotrophy
40. Which of the following is NOT an example of metabolism?
A. Photosynthesis
B. Protein synthesis
C. Cell division
D. Crystallization of salt
✅ Answer: D. Crystallization of salt
41. Which of the following is considered the fundamental property of life?
A. Growth
B. Reproduction
C. Metabolism
D. Consciousness
✅ Answer: C. Metabolism
42. Which is a characteristic feature of living beings but absent in non-living things?
A. Response to stimuli
B. Growth by accumulation of material
C. Crystallization
D. Increase in size
✅ Answer: A. Response to stimuli
43. Viruses are placed between living and non-living because:
A. They contain DNA/RNA
B. They reproduce only inside a host cell
C. They do not have cell membrane
D. All of the above
✅ Answer: D. All of the above
44. Who is called the “Father of Taxonomy”?
A. Aristotle
B. Darwin
C. Carl Linnaeus
D. Whittaker
✅ Answer: C. Carl Linnaeus
45. The ability to sense the environment and respond to it is known as:
A. Consciousness
B. Growth
C. Reproduction
D. Metabolism
✅ Answer: A. Consciousness
46. Which of the following organisms lack a true nucleus?
A. Protozoa
B. Bacteria
C. Fungi
D. Algae
✅ Answer: B. Bacteria
47. The chemical basis of life is formed mainly by:
A. Proteins and Lipids
B. Carbohydrates and Nucleic acids
C. Biomolecules
D. Inorganic salts
✅ Answer: C. Biomolecules
48. Which of the following statements about living organisms is incorrect?
A. All living beings require energy
B. Living beings show metabolism
C. All living beings reproduce without exception
D. Living organisms evolve over generations
✅ Answer: C. All living beings reproduce without exception
49. The study of living organisms in their natural environment is called:
A. Morphology
B. Ecology
C. Anatomy
D. Cytology
✅ Answer: B. Ecology
50. Which one of the following properties is not shared by all living beings?
A. Metabolism
B. Consciousness
C. Cell organization
D. Sexual reproduction
✅ Answer: D. Sexual reproduction
Q.51. Which one of the following cannot be considered as a defining characteristic of living organisms?
A. Growth
B. Ability to make sound
C. Metabolism
D. Consciousness
✅ Answer: B. Ability to make sound
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