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1. Which of the following is considered the most fundamental characteristic that distinguishes living organisms from non-living things?
A. Growth
B. Metabolism
C. Reproduction
D. Consciousness
Answer: B. Metabolism
Explanation: Metabolism, the sum total of all chemical reactions occurring in the body, is considered a defining, non-exclusive but universal characteristic of all living organisms, present in every living cell.
2. Growth in living organisms is characterized mainly by
A. An irreversible permanent increase in mass and number of cells
B. A temporary increase in size that can be reversed
C. Only cell division without increase in size
D. Loss of cells over time
Answer: A. An irreversible permanent increase in mass and number of cells
Explanation: In living organisms, growth involves an irreversible, permanent increase in mass of an individual or its parts, driven by cell division and cell enlargement.
3. Which of these is true regarding reproduction as a defining feature of living organisms?
A. It is a characteristic of most, but not all, living organisms (e.g., mules and sterile worker bees do not reproduce)
B. Every single living organism must reproduce without exception
C. Reproduction is exclusive to plants only
D. Reproduction always occurs asexually
Answer: A. It is a characteristic of most, but not all, living organisms (e.g., mules and sterile worker bees do not reproduce)
Explanation: While reproduction is common in the living world, it is not a defining feature for all organisms since sterile individuals like mules or worker bees do not reproduce despite being alive.
4. The ability of an organism to sense and respond to changes in its environment is called
A. Consciousness (response to stimuli)
B. Growth
C. Reproduction
D. Metabolism
Answer: A. Consciousness (response to stimuli)
Explanation: The ability to sense environmental cues (light, heat, sound, chemicals) and respond to them is called consciousness or response to stimuli, considered a defining property of living organisms.
5. Taxonomy is the branch of biology concerned with
A. Identification, nomenclature, and classification of organisms
B. Study of the internal structure of organisms only
C. Study of the function of body organs
D. Study of fossils only
Answer: A. Identification, nomenclature, and classification of organisms
Explanation: Taxonomy involves the characterisation, identification, classification, and nomenclature of organisms based on their similarities and differences.
6. The scientific naming of organisms in a way that gives each organism a specific name is called
A. Nomenclature
B. Identification
C. Classification
D. Systematics
Answer: A. Nomenclature
Explanation: Nomenclature is the process of giving a scientific name to an organism so it can be recognized universally, following standardized rules.
7. The binomial nomenclature system was given by
A. Carolus Linnaeus
B. Charles Darwin
C. Gregor Mendel
D. Robert Whittaker
Answer: A. Carolus Linnaeus
Explanation: The binomial nomenclature system, giving every species a two-part scientific name, was introduced by the Swedish botanist Carolus Linnaeus.
8. In binomial nomenclature, the scientific name of an organism consists of
A. Genus name followed by species name
B. Only the species name
C. Family name followed by genus name
D. Kingdom name followed by species name
Answer: A. Genus name followed by species name
Explanation: In binomial nomenclature, a scientific name consists of two parts: the genus name (capitalized) followed by the species name (lowercase), e.g., Mangifera indica.
9. According to universal rules, scientific names are usually written or printed in
A. Italics (or underlined if handwritten)
B. Bold, uppercase letters
C. Regular, non-italic font
D. All capital letters
Answer: A. Italics (or underlined if handwritten)
Explanation: As per international convention, scientific names are always written in italics, or underlined individually when handwritten, to distinguish them from ordinary text.
10. The scientific name of humans is
A. Homo sapiens
B. Panthera leo
C. Mangifera indica
D. Felis catus
Answer: A. Homo sapiens
Explanation: Homo sapiens is the binomial scientific name for modern humans, where Homo is the genus and sapiens is the species.
11. In the scientific name, the first word representing the genus always begins with a
A. Capital letter
B. Small letter
C. Numeral
D. Special symbol
Answer: A. Capital letter
Explanation: By convention, the genus name in a binomial scientific name is always capitalized, while the species name is written in lowercase.
12. Arranging organisms into hierarchical groups (or categories) based on shared characteristics is called
A. Classification
B. Nomenclature
C. Identification
D. Metabolism
Answer: A. Classification
Explanation: Classification is the process of arranging organisms into groups or taxa on the basis of similarities and differences, making study more convenient.
13. The process of determining the correct name and place of an organism in a classification system, usually with the help of keys, is called
A. Identification
B. Nomenclature
C. Systematics
D. Taxonomy
Answer: A. Identification
Explanation: Identification is the process of correctly recognizing an organism based on its characteristics, often assisted by comparison with already classified specimens.
14. A taxonomic aid used for the identification of organisms, based on contrasting characters usually in pairs, is called a
A. Taxonomic key
B. Herbarium
C. Botanical garden
D. Museum
Answer: A. Taxonomic key
Explanation: Taxonomic keys consist of a series of contrasting statements (couplets) that help identify plants and animals based on their similarities and differences.
15. A place where dried, pressed, and preserved plant specimens are mounted on sheets and arranged systematically is called a
A. Herbarium
B. Zoological park
C. Botanical garden
D. Museum
Answer: A. Herbarium
Explanation: A herbarium is a storehouse of collected plant specimens, dried, pressed, and preserved on sheets along with a label giving details of the plant.
16. Places where living plants are grown for reference and identification purposes are called
A. Botanical gardens
B. Herbaria
C. Zoos
D. Museums
Answer: A. Botanical gardens
Explanation: Botanical gardens maintain collections of living plants for reference, and many also have herbaria for research and identification.
17. Places where wild animals are kept in a protected environment for public viewing, feeding, and breeding are called
A. Zoological parks (zoos)
B. Botanical gardens
C. Herbaria
D. Museums
Answer: A. Zoological parks (zoos)
Explanation: Zoological parks (zoos) are places where live animals are kept in protected environments, allowing study of their food habits and behaviour.
18. Museums typically preserve specimens by
A. Preservation in preservative solutions or as dry specimens
B. Keeping them alive indefinitely
C. Growing them in soil
D. Freezing them at extremely low temperatures only
Answer: A. Preservation in preservative solutions or as dry specimens
Explanation: Museums preserve specimens, often collected and killed, in preservative solutions, or as dry specimens (like insect collections) for study and display.
19. A taxon is best described as
A. A unit or category used in classification, such as species or genus
B. Only the highest rank in the hierarchy (Kingdom)
C. A scientific name given to a single organism
D. A type of taxonomic key
Answer: A. A unit or category used in classification, such as species or genus
Explanation: A taxon refers to any unit of classification at any level of the hierarchy, such as species, genus, family, order, class, phylum/division, and kingdom.
20. Which of the following is the correct sequence of taxonomic categories from lowest (most specific) to highest (most general)?
A. Species → Genus → Family → Order → Class → Phylum → Kingdom
B. Kingdom → Phylum → Class → Order → Family → Genus → Species
C. Species → Family → Genus → Order → Kingdom → Class → Phylum
D. Genus → Species → Family → Kingdom → Order → Class → Phylum
Answer: A. Species → Genus → Family → Order → Class → Phylum → Kingdom
Explanation: The taxonomic hierarchy proceeds from the most specific unit, species, up through genus, family, order, class, and phylum, to the broadest category, kingdom.
21. A species is best defined as
A. A group of individuals with fundamental similarities, capable of interbreeding to produce fertile offspring
B. A group of organisms belonging to different genera
C. Any single organism, regardless of relation to others
D. The broadest classification category
Answer: A. A group of individuals with fundamental similarities, capable of interbreeding to produce fertile offspring
Explanation: Species is the basic taxonomic unit, referring to a group of organisms that share fundamental similarities and can naturally interbreed to produce fertile offspring.
22. A genus comprises
A. A group of related species
B. A single species only
C. A group of related families
D. Individual organisms of a single population
Answer: A. A group of related species
Explanation: A genus is a taxonomic category that groups together species which resemble one another in certain correlated characters, such as Panthera including lion, tiger, and leopard.
23. Family, as a taxonomic category, is a group of
A. Related genera with a few similar characters
B. Related species only
C. Related classes
D. Unrelated organisms of different orders
Answer: A. Related genera with a few similar characters
Explanation: Family is a taxonomic category above genus, containing genera that share a few similar characters compared to genera of other families.
24. Which taxonomic category groups related families together?
A. Order
B. Genus
C. Species
D. Kingdom
Answer: A. Order
Explanation: Order is a taxonomic category that groups related families sharing certain common characteristics, positioned above family in the hierarchy.
25. The taxonomic category that groups related orders is called
A. Class
B. Phylum
C. Kingdom
D. Genus
Answer: A. Class
Explanation: A class comprises related orders; for example, the order Primata (which includes humans) belongs to the class Mammalia.
26. In the plant kingdom, the taxonomic category equivalent to phylum (used for animals) is called
A. Division
B. Class
C. Order
D. Family
Answer: A. Division
Explanation: While "phylum" is used for animal classification, the equivalent category in plant classification, grouping related classes, is called "division."
27. Kingdom is the
A. Highest and most inclusive taxonomic category
B. Lowest and most specific taxonomic category
C. Same as species
D. Same as genus
Answer: A. Highest and most inclusive taxonomic category
Explanation: Kingdom is the highest (most inclusive) rank in the taxonomic hierarchy, encompassing all lower categories such as phylum, class, order, family, genus, and species.
28. Why is it necessary to use scientific names instead of common (local) names for organisms?
A. Common names vary by region and language, while scientific names are universally standardized
B. Scientific names are shorter and easier to pronounce than common names
C. Common names are more precise than scientific names
D. Scientific names change frequently, unlike common names
Answer: A. Common names vary by region and language, while scientific names are universally standardized
Explanation: Common names differ across regions and languages and can refer to different organisms in different places, so scientific names governed by universal rules ensure that each organism has one recognized name worldwide.
29. Systematics is best described as the study that deals with
A. Diversification of living organisms along with their identification, nomenclature, and classification based on evolutionary relationships
B. Only naming organisms without regard to their diversity
C. Only the internal anatomy of organisms
D. Only fossil records of extinct organisms
Answer: A. Diversification of living organisms along with their identification, nomenclature, and classification based on evolutionary relationships
Explanation: Systematics is a broader term than taxonomy, encompassing the study of the kinds and diversity of organisms and their evolutionary relationships, in addition to identification, nomenclature, and classification.
30. Which of the following pairs of organisms would most likely belong to the same genus?
A. Lion (Panthera leo) and Tiger (Panthera tigris), since they share the same genus name
B. Lion (Panthera leo) and Cat (Felis catus), since both are mammals
C. Mango (Mangifera indica) and Wheat (Triticum aestivum), since both are plants
D. Any two organisms that live in the same habitat
Answer: A. Lion (Panthera leo) and Tiger (Panthera tigris), since they share the same genus name
Explanation: Organisms belong to the same genus if they share the first part of their binomial scientific name; lion and tiger share the genus name Panthera, indicating close relatedness despite being different species.
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