The Living World Mock Test – Class 11 Biology

1. In a cell-free extract, an enzyme continues to catalyse the symbolic conversion . This observation is best interpreted as:

2. Two research summaries are compared.
P. Species are treated only as labels in an alphabetical list, with no investigation of population relationships.
Q. Natural populations are tested for interbreeding, reproductive isolation and their role in evolutionary divergence.
Which evaluation best reflects Ernst Mayr’s contribution?

3. Assertion: A family usually contains more organisms than any one genus included within it.
Reason: Members of one genus generally share more characters than organisms distributed across the entire family.

4. Assertion: Converting a correctly written biological name from printed to handwritten form does not require changing its capitalisation or component order.
Reason: Biological names are generally Latin or Latinised.

5. Suppose evolutionary relationships are deliberately removed from a systematic investigation, while identification, naming and grouping are retained. The study would lose its strongest basis for:

6. An animal shows the defining broad characters of Mammalia but differs consistently from every tested member of Order P in an order-level character set. Arrange the defensible classification steps.
P. Confirm the mammalian class-character pattern.
Q. Compare the animal with the diagnostic profile of Order P.
R. Use the consistent conflicts to reject placement in Order P.
S. Retain Mammalia and evaluate placement in another mammalian order.

7. An organised living system maintains an internal variable within range . After disturbance, the sequence is . This relation most directly represents:

8. Assertion: Replacing panthera Tigris with Panthera tigris repairs the naming convention without changing the organism represented.
Reason: The correction changes only the initial case of the generic name and specific epithet while preserving both components and their order.

9. Let be the average number of shared characters between species from different families of the same order, and let be the corresponding value for species from different orders of the same class. The expected relation is:

10. Across bacteria, fungi, plants and animals, the common structural condition that completes the statement “living organisms possess ______” is:

11. Species P and Q belong to Genus G, while Species R and S belong to Genus H. If G and H are closely related and placed together in Family F, Family F is:

12. Assertion: The name panthera tigris follows the standard capitalisation convention for a binomial.
Reason: The generic name begins with a capital letter, whereas the specific epithet begins with a small letter.

13. Let indicate that individual is living, indicate that it reproduces, and indicate continuation of its lineage. The relation most consistent with reproductive exceptions is:

14. An early “food organisms” category contains wheat, fish and mushrooms. Such a category may combine biologically unrelated organisms because:

15. A graph plots mean character similarity on the vertical axis for three pair types on the horizontal axis. Pairs from the same family average , pairs from different families of the same order average , and pairs from different orders average . The trend indicates that:

16. Three independent teams compare a newly recognised population X with three established species of Genus G and with species from two other genera. X shares of genus-level characters with every G species but has two stable distinguishing characters not found in any established species. Repeated comparisons give the same result. The strongest inference is:

17. Two databases refer to the same identified organism. Database P displays both words of its binomial in printed italics. Database Q stores the same words, order and capitalisation in plain text because styling is unavailable. The best conclusion is:

18. A taxon is being considered for transfer from Group P to Group Q. Which observation provides the strongest justification?

19. A forest-only survey records distinct kinds of organisms. After adding a lake and a hot-spring site, the cumulative total becomes . How many additional kinds were recorded, and what is the best biological interpretation?

20. A classification merges two close species after ignoring a stable morphological difference that consistently separates their members. The most likely taxonomic consequence is:

21. Let represent the proportion of misidentified entries in a biological resource inventory and its reliability for planning, with sampling effort and documentation quality otherwise unchanged. Which relation is expected?

22. Systems P and Q contain the same molecular component set . P has organised arrangement , Q has random arrangement , and only P displays integrated living function . The relation most consistent with the observation is:

23. Evaluate the following statements.
I. Failure to reproduce by itself proves that an individual is non-living.
II. Other integrated living properties may remain present in a sterile organism.
III. Reproduction still has an important role in biological continuity.

24. The trends expected while moving downward through four ranks are summarised below.

Which conclusion is supported by the complete table?

25. Panthera leo and Panthera tigris differ at species but share Panthera, Felidae, Carnivora, Mammalia, Chordata and Animalia. Across the seven major ranks from species to kingdom, how many taxa do they share, and what is their lowest shared rank?

26. Arrange the stages that connect a biodiversity survey with practical biological-resource planning.
P. Survey habitats and collect representative records.
Q. Describe the relevant characters of each specimen.
R. Identify the organisms and apply accepted names.
S. Organise the verified records within a classification-based inventory.
T. Use the inventory to guide a resource application.

27. Arrange the steps for forming a binomial after an organism has been identified.
P. Determine the genus to which the organism belongs.
Q. Select the corresponding generic name.
R. Select the appropriate specific epithet.
S. Write the generic name followed by the specific epithet.

28. Consider the following statements about taxonomy and systematics.
I. Both involve identification of organisms.
II. Both include nomenclature and classification.
III. Only taxonomy explicitly examines evolutionary relationships.
IV. Systematics extends the shared operations into the study of organismal relationships.

29. Consider the following statements about changes in classification.
I. Revision after relevant new evidence can improve biological accuracy.
II. Every newly observed minor variation requires alteration of the hierarchy.
III. Changing a placement without supporting evidence is arbitrary rather than scientific.
IV. A well-supported placement may remain unchanged until relevant contrary evidence appears.

30. The classifications below are limited to class and phylum.

Bird R and Mammal S are best described as:

31. Two sexually reproducing populations look nearly identical. Members within each population produce fertile offspring, but repeated crosses between the populations fail under suitable conditions. If both populations are merged into one species solely because of their appearance, the most likely consequence is:

32. Match each evidence pattern with the strength of support it provides for recognising a biological taxon. Column II entries may be reused.

33. A motile microorganism consistently moves toward a nutrient source. The nutrient gradient is then reversed while temperature and all other conditions remain constant. After detecting the change, the organism is expected to:

34. Three vessels receive the same substrate. Vessel P contains an active cell-free extract, vessel Q contains the same extract after heat inactivation, and vessel R contains buffer without extract. Product appears only in P. The strongest justified inference is:

35. In the statement “Mammalia occupies the rank of class,” Mammalia represents:

36. Taxon X is placed using a stable combination of internal structure and developmental characters. New observations show only that its seasonal abundance has increased; none of the diagnostic characters or relationships has changed. The expected taxonomic outcome is:

37. Independent teams classify man as Homo sapiens within Chordata and housefly as Musca domestica within Arthropoda. Despite the different phyla, every team retains both organisms within Animalia. The result supports the inference that:

38. Two graphs are recorded after cell division. In Record P, tissue-cell number doubles but multicellular-organism number remains . In Record Q, free-living cell number and organism number both double. The defining difference is that:

39. Equal boulders are placed in two chambers. One receives a mineral spray, while the other is shielded. Only the sprayed boulder gains mass, and the gain disappears when its coating is scraped off. No cellular organisation or chemical self-regulation is detected. The strongest inference is:

40. Research groups in several countries identify the same organism and use one accepted scientific name for it. The most likely effect on their communication is:

41. Arrange the following descriptions from the narrowest task to the broadest biological study.
P. Assigning an accepted scientific name
Q. Characterising, identifying, classifying and naming organisms
R. Performing the operations in Q while also interpreting evolutionary relationships

42. A unicellular culture is exposed to increasing concentrations of a repellent chemical.

The most defensible interpretation is:

43. Match each entry with its role in binomial nomenclature. Each Column II entry is used once.

44. A naming dispute concerns a newly described flowering plant. In the terminology used for plant names, the internationally agreed criteria should be taken from ______ rather than from an animal-naming framework.

45. When classification moves upward from species toward kingdom, the number of characters shared by every member generally:

46. An observer distinguishes a dog from a cat only after comparing body form, muzzle, claws and characteristic behaviour together. This demonstrates that category recognition depends mainly on:

47. Two groups examine replicate specimens. Group P records relevant characters, determines identity, assigns hierarchical placement and then applies the accepted name. Group Q begins with a familiar name and records only features that appear to support it. Independent reviewers agree consistently with P but frequently reject Q’s conclusions. The results support:

48. Solanaceae and Convolvulaceae are treated as separate families but are placed together in Polymoniales. Their taxonomic relationship is best represented as:

49. When Panthera Tigris is corrected without changing either word or their order, the specific epithet must begin with a ______ initial.

50. Seasonal breeders are maintained under identical temperature and feeding conditions.

The pattern supports the conclusion that: