CBSE Class 9 Science Chapter 12 Patterns In Life Diversity And Classification MCQs Set 01

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Chapter-wise Objective Questions: Chapter 12 Patterns In Life Diversity And Classification

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Question: Which of the following regions in India is recognized as a global biodiversity hotspot known for supporting a large number of endemic species?
A. The coastal plains of Tamil Nadu
B. The Western Ghats and the Himalayas
C. The Deccan Plateau only
D. The Indo-Gangetic plains
Show Answer & Explanation

Answer: (B) The Western Ghats and the Himalayas

Explanation:
The chapter explicitly lists the Western Ghats, Indo-Burma, the Himalayas, and Sundaland as examples of global biodiversity hotspots in and around India where numerous endemic species are found.

Question: Small variations among individuals in a population become significant over time because they
A. allow organisms to adapt to changing environmental conditions
B. prevent all organisms from looking identical
C. reduce the overall diversity of the population
D. occur only in aquatic environments
Show Answer & Explanation

Answer: (A) allow organisms to adapt to changing environmental conditions

Explanation:
The text explains that small differences among individuals affected their chances of survival and reproduction by helping them adapt to changed conditions, and these differences accumulated over many generations to produce new life forms.

Question: In the two kingdom classification system, the fundamental problem arose because organisms such as Amoeba and Paramecium
A. were too small to be observed accurately
B. moved like animals but were unicellular and heterotrophic, unlike typical plants and animals
C. could survive in both water and land
D. did not have any cell membrane
Show Answer & Explanation

Answer: (B) moved like animals but were unicellular and heterotrophic, unlike typical plants and animals

Explanation:
• Amoeba and Paramecium move like animals but are unicellular
• They lack the multicellular nature of typical plants and animals
• They are heterotrophic rather than fitting the Plantae or Animalia definitions clearly
• This confusion led to the creation of the kingdom Protista.

Question: The presence of vascular tissues (xylem and phloem) in pteridophytes allows these plants to
A. perform photosynthesis more efficiently than other plants
B. transport water and food throughout the plant to all its parts
C. reproduce without requiring water
D. develop flowers and seeds
Show Answer & Explanation

Answer: (B) transport water and food throughout the plant to all its parts

Explanation:
Pteridophytes possess specialized transport tissues—xylem and phloem—which transport water and food, respectively, throughout the plant, enabling them to grow larger and survive on land better than bryophytes.

Question: Gymnosperms are well-adapted to cold and dry regions because their
A. flowers attract many pollinators
B. leaves are broad and have large surface area
C. needle-like or scale-like leaves reduce water loss
D. seeds are enclosed within protective fruits
Show Answer & Explanation

Answer: (C) needle-like or scale-like leaves reduce water loss

Explanation:
The chapter states that gymnosperm leaves are needle-like or scale-like, which reduces water loss and allows them to withstand harsh conditions characteristic of cold and dry environments.

Question: Which characteristic distinguishes angiosperms from all other plant groups and makes them the most diverse plant group on Earth?
A. Possession of true roots and stems
B. Ability to produce seeds protected by a seed coat
C. Production of flowers and fruits that aid in efficient reproduction and seed dispersal
D. Development of vascular tissues for transport
Show Answer & Explanation

Answer: (C) Production of flowers and fruits that aid in efficient reproduction and seed dispersal

Explanation:
Angiosperms produce both flowers—which attract pollinators and increase reproduction efficiency—and fruits that help spread seeds to new locations, allowing them to occupy a wider range of environments than any other plant group.

Question: A biologist observing an organism with no notochord but possessing organ system level organization would classify it as belonging to
A. Protochordates
B. Invertebrates
C. Vertebrates
D. Echinoderms specifically
Show Answer & Explanation

Answer: (B) Invertebrates

Explanation:
Invertebrates are defined as animals without a notochord yet showing organ system level organization, distinguishing them from simpler invertebrates and from all vertebrates which possess a notochord or vertebral column.

Question: The external skeleton of arthropods provides multiple survival advantages in harsh environments primarily by
A. allowing rapid growth and development
B. protecting the body, reducing water loss, and supporting powerful muscles for movement
C. facilitating the absorption of oxygen through the outer surface
D. enabling the arthropod to change color and blend with surroundings
Show Answer & Explanation

Answer: (B) protecting the body, reducing water loss, and supporting powerful muscles for movement

Explanation:
The chapter explicitly states that the hard external skeleton of arthropods provides protection, reduces water loss, and supports powerful muscles, allowing them to survive in dry and exposed environments.

Question: If a scientist discovered a multicellular organism that lacked chlorophyll, had a cell wall made of chitin, and obtained nutrients by absorbing them from dead organic matter, it would most logically be classified in the kingdom
A. Plantae
B. Animalia
C. Fungi
D. Protista
Show Answer & Explanation

Answer: (C) Fungi

Explanation:
This organism matches the defining characteristics of fungi: multicellular eukaryotes with chitin cell walls that are heterotrophic and obtain nutrients by absorption from dead or decaying organic matter (saprophytic nutrition).

Question: The binomial nomenclature system introduced by Carolus Linnaeus serves a critical scientific purpose because it
A. allows organisms to be named differently in each country
B. provides a universal, standardized way for scientists worldwide to discuss the same organism
C. simplifies classification by using only one name for each organism
D. replaces the need for understanding an organism's evolutionary relationships
Show Answer & Explanation

Answer: (B) provides a universal, standardized way for scientists worldwide to discuss the same organism

Explanation:
The chapter explains that scientists from different regions use different local names for the same organism, causing confusion; binomial nomenclature solves this by providing a universal system using Latin scientific names recognized worldwide.

Question: Comparing the fern stem cross-section with a higher plant stem reveals that pteridophytes
A. lack any vascular tissue whatsoever
B. have simpler vascular tissue organization than flowering plants
C. possess more advanced vascular tissue than angiosperms
D. cannot transport nutrients efficiently
Show Answer & Explanation

Answer: (B) have simpler vascular tissue organization than flowering plants

Explanation:
Activity 12.7 directs students to compare fern stems with sunflower stems, revealing differences in vascular tissue structure, with higher plants showing more advanced development of these tissues.

Question: The classification of bryophytes as 'amphibians of the plant kingdom' most accurately reflects the fact that they
A. can photosynthesize both on land and in water
B. require water for reproduction despite having adapted to survive on moist land
C. possess both roots for water absorption and leaves for photosynthesis
D. can switch between heterotrophic and autotrophic nutrition
Show Answer & Explanation

Answer: (B) require water for reproduction despite having adapted to survive on moist land

Explanation:
Bryophytes have begun to colonize land with structures like rhizoids and leaf-like parts, yet they still require water for reproduction as male reproductive cells must swim to reach female cells, making them dependent on moisture despite living on land.

Question: The hierarchical nature of the classification system ensures that at each lower level of the hierarchy, organisms
A. become less related to one another evolutionarily
B. share progressively more specific characteristics in common
C. are increasingly diverse in their habitats and behaviors
D. have fewer total individuals existing in nature
Show Answer & Explanation

Answer: (B) share progressively more specific characteristics in common

Explanation:
Classification proceeds from Kingdom (broadest, most general) to Species (narrowest, most specific). At each step downward, organisms are grouped based on increasingly specific shared features, so members of a genus share more in common than members of a family.

Question: Fossils serve as crucial evidence in understanding how life has changed because they
A. prove that all modern organisms evolved from a single ancestor
B. show preserved remains in rock layers where older layers typically contain simpler organisms and newer layers show more complex forms
C. demonstrate that evolution occurs instantly in response to environmental change
D. indicate which organisms are currently the most successful on Earth
Show Answer & Explanation

Answer: (B) show preserved remains in rock layers where older layers typically contain simpler organisms and newer layers show more complex forms

Explanation:
The chapter states that fossils are preserved remains found in layers of rock, sand and mud, with generally older layers containing simpler organisms and newer layers showing more complex forms, providing a natural record of life's changes over millions of years.

Question: The reduction in biodiversity caused by human activities such as deforestation and pollution poses a particular threat because
A. some species are more important to ecosystems than others
B. when one species disappears, other species dependent on it may decline and eventually also disappear
C. plants are more valuable to nature than animals are
D. humans can easily create new species to replace lost ones
Show Answer & Explanation

Answer: (B) when one species disappears, other species dependent on it may decline and eventually also disappear

Explanation:
The chapter explains that each species plays an important role, and when one species disappears, others that depend on it may decline in number and eventually also disappear, disrupting entire ecosystems and food webs.

Question: Endemic species are significant in defining biodiversity hotspots because they
A. are larger and require more conservation resources than other species
B. exist only in particular regions of the world and are not found naturally anywhere else
C. migrate between different regions seasonally
D. compete with other species for resources
Show Answer & Explanation

Answer: (B) exist only in particular regions of the world and are not found naturally anywhere else

Explanation:
The chapter defines endemic species as those restricted to particular regions of the world and not found naturally anywhere else, exemplifying them with the Nilgiri tahr and Lion-tailed macaque, making them key indicators of biodiversity hotspots.

Question: Which of the following characteristics most directly explains why bryophytes must remain in moist environments despite their colonisation of land?
A. They lack a waxy protective layer on their body surface
B. They depend on water for their reproductive process and lack vascular tissues
C. They possess only a simple thallus without differentiated roots
D. They are unable to absorb nutrients from soil without constant moisture
Show Answer & Explanation

Answer: (B) They depend on water for their reproductive process and lack vascular tissues

Explanation:
Bryophytes represent a transition to land but still require water for reproduction because their male reproductive cells must swim through water to reach female cells. Additionally, without vascular tissues to transport water, they cannot survive in dry conditions and must stay in moist habitats.

Question: In the context of animal evolution, the development of a notochord in protochordates was significant because it
A. allowed animals to grow much larger than invertebrates
B. provided internal support without restricting movement and led to vertebral column development
C. enabled animals to survive in terrestrial environments for the first time
D. permitted the development of specialized sensory organs like eyes and ears
Show Answer & Explanation

Answer: (B) provided internal support without restricting movement and led to vertebral column development

Explanation:
The notochord serves as internal support while maintaining flexibility, representing a crucial structural innovation. In vertebrates, the notochord eventually develops into the vertebral column, marking a major step in animal body organisation evolution.

Question: How would the primary productivity and oxygen release in an ecosystem be affected if all photosynthetic organisms were removed?
A. Only heterotrophic organisms would suffer; producers would quickly regenerate from stored seeds
B. The entire food web would collapse since most organisms ultimately depend on photosynthetic organisms for energy and oxygen
C. Decomposers would increase in number to compensate for the lost plants
D. Ecosystems would transition to anaerobic metabolism and eventually stabilise
Show Answer & Explanation

Answer: (B) The entire food web would collapse since most organisms ultimately depend on photosynthetic organisms for energy and oxygen

Explanation:
Photosynthetic organisms form the base of most food webs and are the primary source of oxygen production on Earth. Their removal would eliminate energy entry into the ecosystem and deplete atmospheric oxygen, causing ecosystem collapse.

Question: The scientific naming system introduced by Carolus Linnaeus specifies that the genus name must begin with a capital letter while the species name is lowercase. What purpose does this standardised formatting serve?
A. It makes scientific names easier to pronounce across different languages
B. It creates a universal convention that prevents confusion and allows scientists worldwide to identify organisms precisely using a standardised system
C. It distinguishes living organisms from non-living matter in scientific texts
D. It indicates the hierarchical level at which an organism should be classified
Show Answer & Explanation

Answer: (B) It creates a universal convention that prevents confusion and allows scientists worldwide to identify organisms precisely using a standardised system

Explanation:
Standardisation in scientific nomenclature ensures that all scientists, regardless of language or region, can communicate about the same organism using identical names and formatting. This universal system eliminates ambiguity arising from common names.

Question: Considering the hierarchical nature of classification, at which level would you expect to find the greatest number of organisms sharing similar traits?
A. Kingdom, because it contains all organisms at the broadest level
B. Genus, because organisms at this level share more characteristics than those at higher levels
C. Species, since organisms here share the most characteristics and can interbreed
D. Phylum, which balances breadth of diversity with meaningful shared features
Show Answer & Explanation

Answer: (C) Species, since organisms here share the most characteristics and can interbreed

Explanation:
Species represents the most specific level in the hierarchy where organisms are most closely related and share the maximum number of characteristics. Members of a species can interbreed and produce fertile offspring, making it the most restrictive and specific grouping.

Question: If a student observed that lichens change colour based on air pollutant concentration, this observation demonstrates that lichens function as natural indicators of environmental quality because they
A. are found only in polluted regions and nowhere else
B. • Consist of a symbiotic relationship sensitive to air quality • Show visible colour changes that reflect pollutant levels • Can be easily identified and monitored by researchers
C. c
D. produce different pigments depending on seasonal changes in temperature
Show Answer & Explanation

Answer: (C) c

Explanation:
Lichens are symbiotic associations of algae and fungi that are sensitive to air pollution. Their colour changes correlate with pollutant concentrations, making them reliable bioindicators. Researchers can use these colour variations to measure air quality without expensive equipment.

Question: The classification of fungi in a separate kingdom rather than grouping them with plants was justified primarily because fungi
A. are larger in size and live longer than most plants
B. lack chlorophyll, absorb nutrients from dead matter by decomposition, and have a fundamentally different mode of nutrition and reproduction than plants
C. are found only in damp environments while plants can survive in dry regions
D. reproduce faster through spores compared to seed-bearing plants
Show Answer & Explanation

Answer: (B) lack chlorophyll, absorb nutrients from dead matter by decomposition, and have a fundamentally different mode of nutrition and reproduction than plants

Explanation:
Fungi differ from plants in multiple critical ways: they are heterotrophic rather than autotrophic, they absorb nutrients through saprophytic breakdown rather than photosynthesising, and their cell walls contain chitin rather than cellulose. These fundamental differences justify their placement in a distinct kingdom.

Question: The presence of vascular tissues in pteridophytes but not in bryophytes explains why pteridophytes can grow taller and survive in a wider range of habitats because vascular tissues
A. produce the food energy that bryophytes cannot generate without light
B. transport water and nutrients throughout the plant, allowing greater height and independence from moisture-saturated environments
C. enable pteridophytes to photosynthesise more efficiently than bryophytes
D. allow pteridophytes to reproduce without requiring water, unlike bryophytes
Show Answer & Explanation

Answer: (B) transport water and nutrients throughout the plant, allowing greater height and independence from moisture-saturated environments

Explanation:
Xylem and phloem in pteridophytes function as specialised transport systems, delivering water and nutrients to all plant parts. This capability allows pteridophytes to achieve greater height, reduce dependence on surrounding moisture, and exploit diverse habitats unavailable to bryophytes lacking these tissues.

Question: In Aristotle's classification system from the 4th century BCE, animals were grouped based on their habitat—land, water, and air. Why did this approach eventually prove insufficient for organizing the vast diversity of life forms discovered later?
A. It relied too heavily on easily observable external characteristics rather than fundamental structural differences
B. It could not accommodate microscopic organisms that were invisible to the naked eye
C. It failed to account for organisms that could survive in multiple environments simultaneously
D. It grouped together organisms with completely different evolutionary origins simply because they occupied the same habitat
Show Answer & Explanation

Answer: (B) It could not accommodate microscopic organisms that were invisible to the naked eye

Explanation:
While Aristotle's system worked adequately for visible animals, the development of microscopes in the 17th and 18th centuries revealed entire worlds of microscopic organisms—bacteria, protists, and others—that could not be seen or classified using habitat-based criteria. The chapter explains that this limitation drove scientists to develop new classification systems that could accommodate these newly discovered life forms.

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