Chapter 1: The Living World Assertion-Reason Questions | biology Class 11 CBSE

Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 1

Logic Check

Assertion (A): Biological names are written in Latin and printed in italics. Reason (R): Latin is used because it is a classical language that provides stability and universal acceptance independent of modern spoken languages.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 2

Logic Check

Assertion (A): The genus name in a binomial scientific name starts with a capital letter. Reason (R): The specific epithet starts with a capital letter to distinguish it from the genus name.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 3

Logic Check

Assertion (A): Binomial nomenclature ensures that each organism has only one universally accepted scientific name. Reason (R): ICBN and ICZN are international codes that govern the naming of plants and animals respectively, preventing duplication of names.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 4

Logic Check

Assertion (A): As we move from species to kingdom, the number of shared characteristics among members increases. Reason (R): Higher taxonomic categories group more organisms together, reflecting a greater degree of biological similarity.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 5

Logic Check

Assertion (A): Lion (Panthera leo) and tiger (Panthera tigris) belong to the same genus. Reason (R): Both lion and tiger share several common morphological features that place them in genus Panthera.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 6

Logic Check

Assertion (A): Taxonomy is the same as systematics. Reason (R): Systematics additionally considers evolutionary relationships between organisms, making it broader than taxonomy.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 7

Logic Check

Assertion (A): Genus is a higher category than species in the taxonomic hierarchy. Reason (R): Genus comprises a group of related species sharing more characters in common than species of other genera.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 8

Logic Check

Assertion (A): Potato (Solanum tuberosum) and brinjal (Solanum melongena) belong to the same species. Reason (R): Both potato and brinjal belong to the same genus Solanum because they share more characters with each other than with species of other genera.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 9

Logic Check

Assertion (A): 'Phylum' is used for plants and 'Division' is used for animals at the same level of the taxonomic hierarchy. Reason (R): Phylum and Division represent the same rank in the hierarchy but are used for different kingdoms by convention.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 10

Logic Check

Assertion (A): Man (Homo sapiens) belongs to phylum Chordata. Reason (R): Man possesses a notochord and a dorsal hollow neural system, which are the defining features of phylum Chordata.

Reasoning Options

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Assertion-Reason

Hard difficulty • Check the statement and reason

Hard

Question 11

Logic Check

Assertion (A): Taxonomic groups are distinct biological entities and not merely morphological aggregates. Reason (R): Modern taxonomic studies consider external structure, internal structure, cell structure, developmental processes, and ecological information.

Reasoning Options

ByteNotes

Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 12

Logic Check

Assertion (A): The earliest biological classifications were based on evolutionary relationships. Reason (R): Early humans classified organisms primarily based on their uses for food, clothing, and shelter.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 13

Logic Check

Assertion (A): Family Felidae includes both genus Panthera and genus Felis. Reason (R): Cats (Felis) and big cats (Panthera) share enough common features to be placed in the same family despite belonging to different genera.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 14

Logic Check

Assertion (A): Nomenclature is possible even without prior identification of an organism. Reason (R): Nomenclature requires that the organism is first described correctly so that the name can be accurately attached to it.

Reasoning Options

ByteNotes

Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 15

Logic Check

Assertion (A): Order is a higher taxonomic category than family. Reason (R): Order is the assemblage of families that exhibit a few similar characters, and is thus placed above family in the hierarchy.

Reasoning Options

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Assertion-Reason

Easy difficulty • Check the statement and reason

Easy

Question 16

Logic Check

Assertion (A): The number of known species on Earth is fixed and will not change in the future. Reason (R): As new areas are explored and old ones revisited, new organisms are continuously being identified.

Reasoning Options

ByteNotes

Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 17

Logic Check

Assertion (A): Mango and wheat both belong to Division Angiospermae. Reason (R): Both mango and wheat are flowering plants that produce seeds enclosed in fruits, the defining feature of Angiospermae.

Reasoning Options

ByteNotes

Assertion-Reason

Hard difficulty • Check the statement and reason

Hard

Question 18

Logic Check

Assertion (A): Higher taxonomic categories are easier to define than lower ones. Reason (R): Lower taxa have more characteristics in common among members, making them more specifically definable.

Reasoning Options

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Assertion-Reason

Medium difficulty • Check the statement and reason

Medium

Question 19

Logic Check

Assertion (A): Insects are recognisable as a group because all insects have three pairs of jointed legs. Reason (R): This shared feature makes insects a distinct taxon at the class level (Insecta), not merely a morphological aggregate.

Reasoning Options

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Assertion-Reason

Hard difficulty • Check the statement and reason

Hard

Question 20

Logic Check

Assertion (A): Carolus Linnaeus used the title 'Systema Naturae' for his publication. Reason (R): Linnaeus invented the concept of biodiversity and first described all 1.7 million known species in Systema Naturae.

Reasoning Options

ByteNotes

Chapter sections

Chapter 1: The Living World | Assertion-Reason

Assertion (A): Biological names are written in Latin and printed in italics. Reason (R): Latin is used because it is a classical language that provides stability and universal acceptance independent of modern spoken languages.

Assertion (A): The genus name in a binomial scientific name starts with a capital letter. Reason (R): The specific epithet starts with a capital letter to distinguish it from the genus name.

Assertion (A): Binomial nomenclature ensures that each organism has only one universally accepted scientific name. Reason (R): ICBN and ICZN are international codes that govern the naming of plants and animals respectively, preventing duplication of names.

Assertion (A): As we move from species to kingdom, the number of shared characteristics among members increases. Reason (R): Higher taxonomic categories group more organisms together, reflecting a greater degree of biological similarity.

Assertion (A): Lion (Panthera leo) and tiger (Panthera tigris) belong to the same genus. Reason (R): Both lion and tiger share several common morphological features that place them in genus Panthera.

Assertion (A): Taxonomy is the same as systematics. Reason (R): Systematics additionally considers evolutionary relationships between organisms, making it broader than taxonomy.

Assertion (A): Genus is a higher category than species in the taxonomic hierarchy. Reason (R): Genus comprises a group of related species sharing more characters in common than species of other genera.

Assertion (A): Potato (Solanum tuberosum) and brinjal (Solanum melongena) belong to the same species. Reason (R): Both potato and brinjal belong to the same genus Solanum because they share more characters with each other than with species of other genera.

Assertion (A): 'Phylum' is used for plants and 'Division' is used for animals at the same level of the taxonomic hierarchy. Reason (R): Phylum and Division represent the same rank in the hierarchy but are used for different kingdoms by convention.

Assertion (A): Man (Homo sapiens) belongs to phylum Chordata. Reason (R): Man possesses a notochord and a dorsal hollow neural system, which are the defining features of phylum Chordata.

Assertion (A): Taxonomic groups are distinct biological entities and not merely morphological aggregates. Reason (R): Modern taxonomic studies consider external structure, internal structure, cell structure, developmental processes, and ecological information.

Assertion (A): The earliest biological classifications were based on evolutionary relationships. Reason (R): Early humans classified organisms primarily based on their uses for food, clothing, and shelter.

Assertion (A): Family Felidae includes both genus Panthera and genus Felis. Reason (R): Cats (Felis) and big cats (Panthera) share enough common features to be placed in the same family despite belonging to different genera.

Assertion (A): Nomenclature is possible even without prior identification of an organism. Reason (R): Nomenclature requires that the organism is first described correctly so that the name can be accurately attached to it.

Assertion (A): Order is a higher taxonomic category than family. Reason (R): Order is the assemblage of families that exhibit a few similar characters, and is thus placed above family in the hierarchy.

Assertion (A): The number of known species on Earth is fixed and will not change in the future. Reason (R): As new areas are explored and old ones revisited, new organisms are continuously being identified.

Assertion (A): Mango and wheat both belong to Division Angiospermae. Reason (R): Both mango and wheat are flowering plants that produce seeds enclosed in fruits, the defining feature of Angiospermae.

Assertion (A): Higher taxonomic categories are easier to define than lower ones. Reason (R): Lower taxa have more characteristics in common among members, making them more specifically definable.

Assertion (A): Insects are recognisable as a group because all insects have three pairs of jointed legs. Reason (R): This shared feature makes insects a distinct taxon at the class level (Insecta), not merely a morphological aggregate.

Assertion (A): Carolus Linnaeus used the title 'Systema Naturae' for his publication. Reason (R): Linnaeus invented the concept of biodiversity and first described all 1.7 million known species in Systema Naturae.

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