Mix Example-Biological Classification Questions in English

(C) In the history of biological classification,$Huz$ $(1978)$ is recognized for proposing the $6$-kingdom classification system.
This system further divided the kingdom $Monera$ into two separate kingdoms: $Archaebacteria$ and $Eubacteria$,based on their distinct evolutionary and biochemical characteristics.
Therefore,the correct option is $C$.

(N/A) $\rightarrow$ Biological classification is a dynamic process that evolves as our understanding of life forms increases.
$\rightarrow$ Initially, early naturalists like Aristotle, Theophrastus, John Ray, and Linnaeus used simple morphological characters for classification.
$\rightarrow$ For instance, Linnaeus classified plants primarily based on their reproductive organs.
$\rightarrow$ As more scientific knowledge was gathered regarding the structure, cell biology, and evolutionary relationships of organisms, the systems of classification became more natural and complex.
$\rightarrow$ This can be justified by the following examples:
$(i)$ The Two-Kingdom classification system was replaced by the Three-Kingdom system when Ernst Haeckel $(1866)$ proposed the Kingdom Protista to include unicellular organisms.
$(ii)$ Later, the system was expanded to a Four-Kingdom classification by Copeland, who proposed the Kingdom Monera for prokaryotic organisms.
$(iii)$ $R.H. Whittaker$ $(1969)$ further refined this into the Five-Kingdom classification system, which is widely accepted today.
$(iv)$ With advancements in molecular biology and the study of archaebacteria, Carl Woese proposed the Three-Domain system, which further classifies life into Bacteria, Archaea, and Eukarya.

(A) $(i)$ Algae are autotrophic organisms that produce their own food via photosynthesis. Fungi are heterotrophic organisms that obtain nutrients by absorbing organic matter.
$(ii)$ Prokaryotes are organisms lacking a membrane-bound nucleus,such as bacteria. Eukaryotes are organisms with a membrane-bound nucleus,such as Paramecium.

(N/A) $\Rightarrow$ Merits of the five-kingdom classification system:
$1$. It separates prokaryotes (Kingdom $Monera$) from eukaryotes (Kingdoms $Protista$,$Fungi$,$Plantae$,and $Animalia$).
$2$. It places unicellular and multicellular organisms into separate groups,unlike the two-kingdom system.
$3$. $Fungi$ are placed in a separate kingdom due to their unique biochemical,physiological,and structural organization.
$4$. It provides a more logical placement for organisms like $Euglena$,which share characteristics of both plants and animals,by placing them in Kingdom $Protista$.
$5$. The $Plantae$ and $Animalia$ kingdoms are more homogenous compared to the two-kingdom system.
$\Rightarrow$ Demerits of the five-kingdom classification system:
$1$. Kingdom $Protista$ is a heterogeneous group that includes organisms with diverse characteristics,such as $Chlamydomonas$ (with cell walls) and $Amoeba$ (without cell walls).
$2$. It does not provide a clear or proper place for viruses,viroids,and lichens.
$3$. $Yeasts$ are unicellular eukaryotes but are not included in Kingdom $Protista$.
$4$. The classification criteria are still debated for organisms with flexible lifestyles,such as slime moulds.

(N/A) $(i)$ Autotrophic Nutrition: Organisms that possess chlorophyll,such as green plants,can synthesize their own organic food from simple inorganic substances like carbon dioxide and water using light energy. This process is known as autotrophic nutrition,and such organisms are called autotrophs.
$(ii)$ Parasitic Nutrition: Organisms that depend on other living plants or animals (hosts) for their nutrition without killing them immediately are called parasites. This mode of nutrition,where the parasite derives nutrients directly from the host's body,is known as parasitic nutrition.

(B) George Bentham and Joseph Dalton Hooker are renowned for their monumental work, 'Genera Plantarum'.
They proposed a highly influential natural system of classification for seed plants (flowering plants).
This system is widely recognized for its practical utility in herbarium arrangements.

(A) The correct matching is as follows:
$(a)$ Saprotrophs: These organisms obtain nutrients from dead and decaying organic matter $(ii)$.
$(b)$ Omnivores: These organisms consume both plant and animal matter $(iii)$.
$(c)$ Autotrophs: These organisms synthesize their own food using sunlight or chemical energy $(i)$.
$(d)$ Herbivores: These organisms feed exclusively on plant material $(iv)$.
Therefore, the correct sequence is $a-ii, b-iii, c-i, d-iv$.

(C) In organisms like Protista and Monera,the organism or the parent cell divides by mitosis into two to give rise to new individuals. Thus,the offspring produced are genetically and morphologically identical to the parent,which is referred to as a clone. Therefore,they are exact copies of their parents.

(D) Heterotrophic organisms are those that cannot synthesize their own food and depend on other organisms for nutrition.
Consumers (animals) are heterotrophs that feed on plants or other animals.
Microorganisms,such as bacteria and fungi,are decomposers (saprotrophs),which are also a type of heterotroph as they obtain nutrients from dead organic matter.
Therefore,both consumers and microorganisms fall under the category of heterotrophs.

(D) The correct matching is as follows:
$(i)$ Chrysophytes include diatoms and golden algae (desmids). Thus, $(i)$ matches with $(c)$.
$(ii)$ Dinoflagellates include organisms like Gonyaulax. Thus, $(ii)$ matches with $(a)$.
$(iii)$ Euglenoids include organisms like Euglena. Thus, $(iii)$ matches with $(b)$.
$(iv)$ Slime moulds are saprophytic protists, and an example is Plasmodium (an aggregation). Thus, $(iv)$ matches with $(d)$.
Therefore, the correct sequence is $i-c, ii-a, iii-b, iv-d$, which corresponds to option $(D)$.

(D) The correct matches are as follows:
$1$. $(i)$ Chrysophyta includes diatoms and golden algae,so $(i) - b$.
$2$. $(ii)$ Gonyaulax is a well-known genus of dinoflagellates,so $(ii) - d$.
$3$. $(iii)$ Penicillium is a genus of fungi (Ascomycetes),so $(iii) - a$.
$4$. $(iv)$ Slime moulds are saprophytic protists,and their aggregation is called Plasmodium,so $(iv) - c$.
Therefore,the correct sequence is $(i)-b, (ii)-d, (iii)-a, (iv)-c$.

(C) $Saccharomyces$ $cerevisiae$ is a yeast used in making bread (Baker's yeast) and the commercial production of ethanol.
$Paramecium$ and $Plasmodium$ are both Protozoan Protists,while $Penicillium$ is a fungus.
Lichen is a composite organism formed from the symbiotic association of an alga and a fungus.
$Nostoc$ and $Anabaena$ are nitrogen-fixing cyanobacteria (Kingdom Monera).

(B) Bacteria and yeast are both unicellular organisms that can perform fermentation and reproduce by forming spores. However,they differ in their cellular organization. Bacteria are prokaryotic organisms belonging to the kingdom Monera,while yeast is a eukaryotic organism belonging to the kingdom Fungi. Therefore,the statement that both are prokaryotes is incorrect.

(A) Figure $A$ represents Euglena,which is a flagellated protist belonging to the group Euglenoids. It possesses both plant-like characteristics (presence of chlorophyll) and animal-like characteristics.
Figure $B$ represents Paramecium,which is a ciliated protozoan. It is an aquatic organism that moves actively due to the presence of thousands of cilia on its body surface.
Figure $C$ represents Agaricus (commonly known as a mushroom),which belongs to the class Basidiomycetes of the kingdom Fungi.

(D) $R$.$H$. Whittaker $(1969)$ proposed a five kingdom classification system.
The main criteria for classification used by him include cell structure,thallus organisation,mode of nutrition,reproduction,and phylogenetic relationships.
Since all the options listed (mode of nutrition,thallus organisation,and phylogenetic relationships) are part of his criteria,the correct answer is all of the above.

(D) The correct matches are as follows:
$A$. Ascus: It is a sac-like structure found in Ascomycetes fungi,e.g.,$Penicillium$.
$B$. Basidium: It is a club-shaped spore-bearing structure found in Basidiomycetes fungi,e.g.,$Agaricus$ (Mushroom).
$C$. Protista: $Euglena$ is a well-known example of a protist.
$D$. Cyanobacteria: $Spirulina$ is a type of cyanobacteria (blue-green algae).
$E$. Animalia: Sponges (Porifera) belong to the kingdom Animalia.
Therefore,the correct sequence is $A-II, B-III, C-IV, D-I, E-V$.

(A) The correct matching is as follows:
$A$. Plantae includes classes like Algae $(IV)$.
$B$. Fungi includes classes like Phycomycetes $(III)$.
$C$. Protista includes groups like Euglenoids $(II)$.
$D$. Monera includes groups like Archaebacteria $(I)$.
Therefore, the correct sequence is $A-IV, B-III, C-II, D-I$.

(A) The correct matches are as follows:
$1$. Ernst Mayr: Known as the 'Darwin of the 20th century', he contributed significantly to evolutionary biology $(A-IV)$.
$2$. $R$.$H$. Whittaker: Proposed the five-kingdom classification system in $1969$ $(B-III)$.
$3$. $D$.$J$. Ivanowsky: Recognized the causal organism of tobacco mosaic disease and gave the name 'virus' $(C-II)$.
$4$. $T$.$O$. Diener: Discovered viroids, which are smaller than viruses and lack a protein coat $(D-I)$.
Therefore, the correct sequence is $A-IV, B-III, C-II, D-I$.

$(C)$. Red dinoflagellates are represented by $Gonyaulax$ $(II)$, which causes red tides.
$B$. Yeast $(III)$ is a well-known unicellular fungus.
$C$. $Penicillium$ $(IV)$ is a major source of the antibiotic penicillin.
$D$. $Rhizopus$ $(I)$ is commonly known as bread mould.
Therefore, the correct matching is $A-II, B-III, C-IV, D-I$.

(D) $Albugo$ is a parasitic fungus that causes white rust in mustard. It belongs to the class Phycomycetes (Oomycetes) within the kingdom Fungi, not the group Chrysophytes. Chrysophytes include diatoms and golden algae (desmids). Therefore, the pair $Albugo - \text{Chrysophytes}$ is incorrectly matched.

(D) Statement $(i)$ is incorrect because $Animalia$ are heterotrophic.
Statement $(ii)$ is incorrect because $Monera$ are prokaryotic and lack a nuclear membrane.
Statement $(iii)$ is incorrect because $Protista$ are eukaryotic.
Statement $(iv)$ is correct because all organisms in kingdom $Plantae$ possess a cell wall composed of cellulose.

(D) The five kingdom classification proposed by $R.H. Whittaker$ is based on the following criteria:
$1$. Cell structure (Complexity of cell,i.e.,prokaryotic or eukaryotic).
$2$. Body organisation (Unicellular or multicellular).
$3$. Mode of nutrition (Autotrophic or heterotrophic).
$4$. Reproduction (Sexual or asexual methods).
$5$. Phylogenetic relationships (Evolutionary history).
Reserve food material is not a primary criterion used in this classification system. Therefore,option $D$ is the correct answer.

(C) Linnaeus proposed the Two Kingdom classification system,which divided all living organisms into two kingdoms: Plantae and Animalia.
In this system,bacteria were placed under the kingdom Plantae because they possess a cell wall,which was a characteristic feature used to classify plants at that time.

(B) $R.H.$ Whittaker proposed the five-kingdom system of classification in $1969$. The five kingdoms defined by him are Monera,Protista,Fungi,Plantae,and Animalia.

(C) The kingdom $Protista$ includes chrysophytes,dinoflagellates,euglenoids,slime moulds,and protozoans.
$Phycomycetes$ is a class of fungi,not protists.
Therefore,$Phycomycetes$ is the non-protistan group.

(D) The Four-Kingdom Classification system was proposed by Herbert $F$. Copeland in $1956$.
In this system,the kingdom $Monera$ was introduced to include prokaryotic organisms,which were previously grouped with other organisms.
The four kingdoms in this system are $Monera$,$Protista$,$Plantae$,and $Animalia$.
Therefore,the correct answer is $Monera$ and Copeland.

(C) Whittaker's system of classification categorizes organisms into five kingdoms: Monera,Protista,Fungi,Plantae,and Animalia.
Option $A$ is incorrect because Monera are prokaryotic and lack a cellulosic cell wall (they have peptidoglycan).
Option $B$ is incorrect because Protista are primarily aquatic and while they can be photoautotrophs,they are not typically classified as chemoautotrophs.
Option $C$ is correct: Fungi are eukaryotic,mostly multicellular (or loose tissue),heterotrophic (osmotrophs/saprotrophs),and possess a chitinous cell wall.
Option $D$ is incorrect because while Animalia are multicellular,eukaryotic,and holozoic,the term 'no saprobic' is not a defining characteristic used in this specific context compared to the accuracy of option $C$.

(C) In the six-kingdom classification system,organisms are divided into two main groups: Prokaryotes and Eukaryotes.
Prokaryotes include two kingdoms: Archaebacteria and Eubacteria.
Eukaryotes include four kingdoms: Protista,Fungi,Plantae,and Animalia.
Therefore,the domain Eukarya includes $4$ kingdoms.

(C) Fungi are eukaryotic organisms,whereas bacteria are prokaryotic. The structure of flagella in eukaryotes ($9+2$ arrangement of microtubules) is fundamentally different from the flagella found in prokaryotes (composed of the protein flagellin). Therefore,fungi differ from bacteria in their flagella structure.

(D) The Assertion is incorrect because unicellular eukaryotes are classified under the Kingdom $Protista$,not Monera. Kingdom $Monera$ consists of prokaryotic organisms.
The Reason is also incorrect because eukaryotic cells contain $80S$ ribosomes in their cytoplasm (cytoribosomes),whereas $70S$ ribosomes are characteristic of prokaryotes and organelles like mitochondria and chloroplasts.
Therefore,both the Assertion and the Reason are incorrect.

(C) The natural system of classification was developed by George Bentham and Joseph Dalton Hooker.
This system is based on the natural affinities among organisms,considering both external and internal features.
Key features considered include phytochemistry,anatomy,ultra-structure,and embryology.

(C) The artificial system of classification was proposed by $A-\text{Linnaeus}$.
This system was primarily based on gross superficial morphological characters such as habit, color, number, and shape of leaves, etc.

(D) The sexual system of classification,proposed by Carolus Linnaeus,is considered an artificial system of classification.
It is primarily based on the vegetative characters or the superficial morphological characters,specifically the number and arrangement of stamens and carpels.
Since it relies on a limited number of characteristics rather than natural affinities,it is classified as an artificial system.
Therefore,both $(A)$ and $(B)$ are correct.

(A) The Bentham and Hooker's classification system is a natural system of classification. It is primarily based on the actual examination of specimens and morphological characters rather than evolutionary relationships or artificial criteria. Therefore,it is considered a classification of taxa based on actual examination.

(D) The cell wall is a characteristic feature of the cells of plants,bacteria,fungi,algae,and some archaea. It is located outside the cell membrane. The major function of the cell wall is to provide rigidity,tensile strength,structural support,and protection against mechanical stress and infection. It also helps in the diffusion of gases in and out of the cell. Gametes,Amoeba,and Mycoplasma all lack a cell wall.

(D) In cell division,the cell divides into two parts having the same genetic constituent.
Only $Monera$ and $Protista$ are the organisms that are single-celled in the five-kingdom classification system.
Therefore,cell division is the common mode of reproduction in both $Monera$ and $Protista$.

(A) The biodiversity of prokaryotic microorganisms cannot be estimated using conventional taxonomic methods because many of these microbes cannot be cultured in laboratory conditions.
Conventional taxonomic methods rely heavily on morphological and biochemical characterization,which are often insufficient for identifying and classifying the vast diversity of prokaryotes.
Therefore,both the Assertion and the Reason are correct,and the Reason provides the correct explanation for the Assertion.

(N/A) The three-domain system,proposed by Carl Woese,classifies life into Archaea,Bacteria,and Eukarya. The differences are summarized below:

Character	Archaea	Bacteria	Eukarya
Cell type	Prokaryotic	Prokaryotic	Eukaryotic
Histones	Present (similar to eukaryotes)	Absent	Present
Introns	Present in some genes	Absent	Present
Ribosome size	$70S$	$70S$	$80S$ (cytoplasmic)
Cell wall	Non-peptidoglycan (pseudomurein)	Peptidoglycan	Varies (Cellulose in plants,Chitin in fungi)

(N/A) $\rightarrow$ In the two kingdom classification,many unrelated organisms were grouped together under the same kingdom.
$\rightarrow$ The two kingdom system of classification divided organisms only into $Plantae$ and $Animalia$.
$\rightarrow$ In contrast,the five kingdom classification is based on more specific and scientific criteria such as cell structure,body organization,mode of nutrition,and evolutionary relationships (phylogeny).
$\rightarrow$ This system effectively separates organisms like fungi,bacteria,and protists from plants and animals,providing a more accurate representation of biological diversity.

(C) In the five-kingdom system proposed by Whittaker,the kingdoms are Monera,Protista,Fungi,Plantae,and Animalia.
Out of these,Kingdom Monera consists of prokaryotes.
The remaining four kingdoms are eukaryotes,which are as follows:
$\rightarrow$ $(a)$ Protista
$(b)$ Fungi
$(c)$ Plantae
$(d)$ Animalia
Therefore,the total number of eukaryotic kingdoms is $4$.

(D) The five-kingdom classification system proposed by $R.H. Whittaker$ includes the following kingdoms:
$1$. Kingdom $Monera$ (Prokaryotic)
$2$. Kingdom $Protista$ (Eukaryotic)
$3$. Kingdom $Fungi$ (Eukaryotic)
$4$. Kingdom $Plantae$ (Eukaryotic)
$5$. Kingdom $Animalia$ (Eukaryotic)
Out of these five kingdoms,only Kingdom $Monera$ is prokaryotic,while the remaining four kingdoms ($Protista$,$Fungi$,$Plantae$,and $Animalia$) are eukaryotic.
Therefore,the total number of eukaryotic kingdoms is $4$.

(A) The correct matches based on the five-kingdom classification are:
$P$. Monera: The cell wall is made of polysaccharides and amino acids (peptidoglycan). Thus,$P-IV$.
$Q$. Protista: The cell wall is present in some organisms (e.g.,diatoms,dinoflagellates). Thus,$Q-I$.
$R$. Fungi: The cell wall is composed of chitin. Thus,$R-V$.
$S$. Plantae: The cell wall is primarily made of cellulose. Thus,$S-II$.
$T$. Animalia: Cell wall is absent in animals. Thus,$T-III$.
Therefore,the correct sequence is $(P-IV), (Q-I), (R-V), (S-II), (T-III)$.

(D) The five-kingdom classification system,proposed by $R.H. Whittaker$ in $1969$,is based on several key criteria.
These criteria include:
$1$. Cell structure (prokaryotic vs. eukaryotic).
$2$. Thallus organization (unicellular vs. multicellular).
$3$. Mode of nutrition (autotrophic vs. heterotrophic).
$4$. Reproduction (sexual vs. asexual).
$5$. Phylogenetic relationships (evolutionary history).
Therefore,all the given options are correct components of this classification system.

(C) The two-kingdom classification system,proposed by Carolus Linnaeus,divided all living organisms into two kingdoms: Kingdom Plantae and Kingdom Animalia.
In this system,all organisms that possessed a cell wall and were autotrophic (or perceived as plants) were placed in Kingdom Plantae.
Let's analyze the given list:
$1$. Bacteria: Included in Plantae (due to cell wall).
$2$. Blue-green algae: Included in Plantae.
$3$. Fungi: Included in Plantae (due to cell wall).
$4$. Porifera: Animalia.
$5$. Echinodermata: Animalia.
$6$. Mosses: Plantae.
$7$. Bryophytes: Plantae.
$8$. Pteridophytes: Plantae.
$9$. Gymnosperms: Plantae.
$10$. Ctenophora: Animalia.
$11$. Angiosperms: Plantae.
The groups included in Kingdom Plantae are: Bacteria,Blue-green algae,Fungi,Mosses,Bryophytes,Pteridophytes,Gymnosperms,and Angiosperms.
Counting these,we get a total of $8$ groups.

(D) In the two-kingdom classification system proposed by Carolus Linnaeus,all organisms were divided into two kingdoms: Plantae and Animalia. Under this system,both Chlamydomonas and Chlorella were placed in the kingdom Plantae due to the presence of a cell wall and photosynthetic ability.
In the five-kingdom classification system proposed by $R$.$H$. Whittaker,unicellular eukaryotic organisms like Chlamydomonas and Chlorella (which were previously placed in algae under Plantae) were moved to the kingdom Protista.

(C) According to the evolutionary relationships in the five-kingdom classification system,the evolutionary path is as follows:
$1$. The earliest organisms were prokaryotic,belonging to the kingdom Monera.
$2$. From Monera,the eukaryotic kingdom Protista evolved.
$3$. From the ancestral Protista,the three multicellular eukaryotic kingdoms—Fungi,Plantae,and Animalia—diverged independently.
Therefore,the correct evolutionary sequence is Monera -> Protista -> (Fungi,Plantae,Animalia). This corresponds to option $C$.

(D) According to the $5$-kingdom classification system proposed by $R.H. Whittaker$,the kingdom $Plantae$ consists of organisms that are multicellular,eukaryotic,and autotrophic (photosynthetic).
$Monera$ consists of unicellular prokaryotes.
$Protista$ consists of unicellular eukaryotes.
$Fungi$ are multicellular but heterotrophic (saprophytic or parasitic).
Therefore,the correct option is $D$.

(D) Natural systems of classification are based on natural affinities among organisms.
This system considers not only external features but also internal features such as ultrastructure,anatomy,embryology,and phytochemistry.
This type of classification for flowering plants was proposed by George Bentham and Joseph Dalton Hooker.
Therefore,all the given options are correct.

(D) Unicellular organisms are those that consist of a single cell.
$1$. Bacteria are prokaryotic unicellular organisms.
$2$. Protozoa (such as Amoeba and Paramecium) are eukaryotic unicellular organisms.
$3$. Yeast $(Saccharomyces \, cerevisiae)$ is a unicellular fungus.
Therefore, all the given options represent unicellular organisms.

(B) Microorganisms are microscopic organisms that are not visible to the naked eye.
$1$. Protozoa: Microscopic (Included)
$2$. Bacteria: Microscopic (Included)
$3$. Porifera: Multicellular animals,macroscopic (Excluded)
$4$. Fungi: Many are microscopic,e.g.,yeast (Included)
$5$. Bryophytes: Multicellular plants,macroscopic (Excluded)
$6$. Viruses: Microscopic (Included)
$7$. Viroids: Microscopic (Included)
$8$. Prions: Microscopic (Included)
The groups included are Protozoa,Bacteria,Fungi,Viruses,Viroids,and Prions.
Total count = $6$.