Mix Examples- Morphology of Flowering Plants Questions in English

(B) $Triticum$ $durum$ is a tetraploid species of wheat.
It has a chromosome number of $2n = 4x = 28$,where $x = 7$ is the basic haploid chromosome number.
Therefore,it is represented as $4n$ (tetraploid).

(A) The correct answer is $A$. $Cocos$ $nucifera$ (Coconut) is a versatile plant. Its endosperm (kernel) is used to extract edible coconut oil,and the husk of the fruit provides coir fibers,which are used for making ropes,mats,and brushes. While $Brassica$ $campestris$ and $Arachis$ $hypogaea$ are primarily sources of edible oil,they do not provide significant fibers for commercial use.

(D) The most durable wood is obtained from $Tectona$ $grandis$,commonly known as Teak.
Teak wood is highly valued for its durability,water resistance,and resistance to termites and fungi due to the presence of natural oils and silica in the wood.
It is widely used in furniture making,shipbuilding,and construction.

(A) $Cuscuta$ is a well-known parasitic plant that derives nutrients from the host plant.
$Dischidia$ is an epiphytic plant,not insectivorous.
$Opuntia$ is a xerophytic plant,not predatory.
$Capsella$ is a terrestrial plant,not hydrophytic.
Therefore,the correct pair is $Cuscuta$ - Parasitic.

(D) Starch grains found in the latex of certain plants, such as those in the family $Euphorbiaceae$ (e.g., $Manihot$ $esculenta$ or cassava), are typically $dumbbell-shaped$. These specialized starch granules are distinct from the spherical or oval starch grains found in other storage tissues.

(A) In sunflower $(Helianthus \text{ } annuus)$, the inflorescence is of the $Capitulum$ (or $Head$) type, where many small florets are arranged on a flattened receptacle.
The fruit of the sunflower is a $Cypsela$, which is a dry, indehiscent, single-seeded fruit that develops from an inferior ovary.

(A) Aestivation refers to the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl.
In twisted aestivation,one margin of the appendage overlaps that of the next one and so on.
This type of aestivation is characteristic of the family $Malvaceae$ (e.g.,China rose,lady's finger,and cotton).
In $Fabaceae$,the aestivation is vexillary,while in $Asteraceae$,it is often valvate or imbricate.

(C) The botanical name of groundnut (peanut) is $Arachis \text{ } hypogaea$.
$Cicer \text{ } arietinum$ is the botanical name of chickpea (gram).
$Glycine \text{ } max$ is the botanical name of soybean.
$Lens \text{ } esculentus$ is the botanical name of lentil.

(A) The plants $Gossypium$ (cotton),$Hibiscus$ (hemp/fiber),and $Crotalaria$ (sunn hemp) are well-known for producing economically important fibers.
$Gossypium$ provides cotton fibers from the seed coat.
$Hibiscus$ species are used for bast fibers.
$Crotalaria$ $juncea$ is a major source of sunn hemp fiber.

(A) $1$. In tomato ($Solanum$ $lycopersicum$),the fruit is a berry,which develops from a superior ovary and is fleshy. Thus,statement $A$ is correct.
$2$. Orchid seeds are non-endospermic (exalbuminous) and very small,lacking an oily endosperm. Thus,statement $B$ is incorrect.
$3$. In primrose $(Primula)$,the placentation is free-central,not basal. Basal placentation is seen in Asteraceae and Poaceae. Thus,statement $C$ is incorrect.
$4$. Tulip flowers are modified shoots,not roots. Thus,statement $D$ is incorrect.

(A) In $Cashew$ $(Anacardium \text{ } occidentale)$, the edible part is the fleshy pedicel (thalamus) and the cotyledons. However, in the context of standard botanical questions, the cotyledon is the primary edible part of the seed. In $Litchi$ $(Litchi \text{ } chinensis)$, the fleshy, succulent outgrowth arising from the base of the ovule is called the $aril$, which is the edible part. Therefore, $Cashew$ and $Litchi$ represent the correct pair where the cotyledon and aril are the edible parts, respectively.

(D) Seed-surface fibers are epidermal outgrowths of the seed coat.
$1$. Cotton $(Gossypium)$ is a classic example of a seed-surface fiber.
$2$. Kapok $(Ceiba)$ and Red silk cotton $(Salmalia)$ also produce fibers from the inner wall of the fruit or seed coat.
$3$. Dhaincha $(Sesbania)$ is a legume plant where the fiber is obtained from the stem (bast fiber),not the seed surface.
Therefore,$Sesbania$ is not a seed-surface fiber.

(A) Stem thorns (e.g.,in Citrus and Bougainvillea),leaf spines (e.g.,in Opuntia),and prickles (e.g.,in Rose) are all modified structures that serve the primary function of protection against herbivores. These structures prevent animals from grazing on the plants,thereby acting as defensive organs.

(D) The scientific name of Jojoba is $Simmondsia \ chinensis$.
It is a shrub native to the southwestern United States and northwestern Mexico,known for the liquid wax (often called jojoba oil) extracted from its seeds.

(B) Cotton fibers are unicellular outgrowths of the epidermal cells of the seed coat. These fibers are essentially composed of cellulose and are economically significant as a textile raw material. Saffron is obtained from the stigma of the flower,clove is a dried flower bud,and cork is derived from the phellogen (cork cambium) of the periderm,not the epidermis.

(C) Surface fibers are those that arise from the surface of seeds or fruits.
$Gossypium$ (cotton) is the most important source of surface fibers.
These fibers are epidermal outgrowths of the seed coat.
$Cannabis$ and $Agave$ provide bast fibers (phloem fibers),which are obtained from the stem or leaves,not the surface of seeds.
$Helianthus$ (sunflower) is primarily cultivated for its seeds and oil,not for commercial fibers.

(A) George Bentham and Joseph Dalton Hooker published their monumental work 'Genera Plantarum' in three volumes between $1862$ and $1883$.
In this system,they classified seed-bearing plants (Phanerogams) into $202$ families.
This system is widely regarded as one of the most natural systems of classification for seed plants.

(B) According to the Bentham and Hooker classification system for Dicotyledons:
$1$. $(a)$ Inferae: Includes plants with inferior ovaries,such as Sunflower (Asteraceae family). So,$(a)-(iii)$.
$2$. $(b)$ Heteromerae: Includes plants with superior ovaries and more than two carpels,such as Madhuca. So,$(b)-(iv)$.
$3$. $(c)$ Bicarpellatae: Includes plants with superior ovaries and two carpels,such as Catharanthus (Periwinkle). So,$(c)-(v)$.
$4$. $(d)$ Thalamiflorae: Includes plants with superior ovaries and thalamus not expanded,such as Hibiscus. So,$(d)-(i)$.
$5$. $(e)$ Calyciflorae: Includes plants with perigynous or epigynous flowers,such as Rose. So,$(e)-(vi)$.
Therefore,the correct matching is $a-iii, b-iv, c-v, d-i, e-vi$.

(B) In the Bentham and Hooker classification system,the sub-class $Gamopetalae$ is divided into $3$ series: $Inferae$,$Heteromerae$,and $Bicarpellatae$.

(B) $Wolffia$ is a genus of nine to eleven species which include the smallest flowering plants on Earth.
These are commonly known as watermeal or duckweed.
The size of $Wolffia$ plants typically ranges from $0.5$ mm to $1.5$ mm in length.
Therefore,the most accurate range among the given options is $0.5$ to $1.5$ mm.

(B) In the Bentham and Hooker classification system,the series Thalamiflorae is part of the class Dicotyledonae and the subclass Polypetalae. It consists of $6$ orders: Ranales,Parietales,Polygalinae,Caryophyllinae,Guttiferales,and Malvales.

(D) Dicotyledonous plants are characterized by the presence of two cotyledons in their seeds,pentamerous or tetramerous flowers,and reticulate venation in their leaves. The arrangement of ovules (orthotropous,anatropous,etc.) is not a defining characteristic used to distinguish between monocots and dicots. Therefore,the statement that ovules are orthotropous is not a general characteristic associated with dicotyledonous plants.

(B) The scientific name $Bougainvillea$ $spectabilis$ refers to the plant commonly known as $Bougainvillea$.
It is a genus of thorny ornamental vines,bushes,and trees belonging to the family $Nyctaginaceae$.

(B) The Eucalyptus tree,commonly known as the gum tree,is one of the tallest known tree species in the world.
It is known to reach heights of approximately $90-100$ meters.
Therefore,option $B$ is the correct answer.

(D) Bentham and Hooker's classification of Polypetalae is divided into three series:
$1$. Thalamiflorae: Flowers have a dome-shaped receptacle with a superior ovary $(A-iv)$.
$2$. Calyciflorae: Receptacle is cup-shaped or tubular, surrounding the ovary $(B-iii)$.
$3$. Disciflorae: (Not listed here).
For the Gamopetalae series:
$1$. Bicarpellatae: Gynoecium is always bicarpellary $(C-i)$.
$2$. Inferae: Ovary is inferior $(D-v)$.
$3$. Heteromerae: Ovary is superior with more than two carpels $(E-ii)$.
Therefore, the correct matching is $A-iv, B-iii, C-i, D-v, E-ii$.

(B) The scientific name $Helianthus$ $annuus$ refers to the common sunflower.
$Helianthus$ is the genus name,and $annuus$ is the specific epithet.
It belongs to the family $Asteraceae$.

(B) Eucalyptus is a genus of flowering trees in the myrtle family,Myrtaceae. Some species of Eucalyptus,such as Eucalyptus regnans,are known to be among the tallest trees in the world. They can reach heights of approximately $90-100 \ m$.

(C) Dicotyledons (dicots) are characterized by having two cotyledons in their embryo,pentamerous or tetramerous flowers,and reticulate venation in their leaves. Parallel venation is a characteristic feature of monocotyledons,not dicotyledons. Therefore,the statement that leaves exhibit parallel venation is incorrect for dicots.

(B) According to Bentham and Hooker's classification of Polypetalae:
$1$. $(a)$ Bicarpellatae: Characterized by a bicarpellary ovary $(s)$.
$2$. $(b)$ Inferae: Characterized by an inferior ovary $(t)$.
$3$. $(c)$ Thalamiflorae: Characterized by a dome-shaped thalamus with a superior ovary $(r)$.
$4$. $(d)$ Calyciflorae: Characterized by a cup-shaped thalamus $(q)$.
$5$. $(e)$ Heteromerae: Characterized by a superior ovary with more than two carpels $(p)$.
Thus, the correct matching is $(a-s), (b-t), (c-r), (d-q), (e-p)$.

(B) The $S$ statement is true because the inflorescence of Amorphophallus (Elephant foot yam) is indeed very large,reaching heights of up to $6 \ m$.
The $R$ statement is also true because Rafflesia arnoldii is known to produce the largest individual flower in the world,which can reach a diameter of about $1 \ m$ and weigh up to $8-10 \ kg$.
However,the size of the inflorescence in Amorphophallus and the size of the individual flower in Rafflesia are independent biological facts. Therefore,$R$ does not explain $S$.

(C) In the Bentham and Hooker classification system,the subclass Polypetalae is divided into three series: $1$. Thalamiflorae,$2$. Disciflorae,and $3$. Calyciflorae. The series $Inferae$ belongs to the subclass Gamopetalae,not Polypetalae. Therefore,$Inferae$ is the incorrect series for Polypetalae.

(B) Bentham and Hooker classified Polypetalae into three series: Thalamiflorae,Disciflorae,and Calyciflorae.
$1$. Thalamiflorae includes flowers with a convex or conical thalamus and superior ovary (e.g.,$Ranunculaceae$). $Catharanthus$ $roseus$ belongs to the family $Apocynaceae$,which is classified under Gamopetalae,not Polypetalae.
$2$. Disciflorae includes flowers with a prominent disc (e.g.,$Rutaceae$ like $Citrus$ $limon$).
$3$. Calyciflorae includes flowers with a cup-shaped thalamus and perigynous or epigynous ovary (e.g.,$Rosaceae$ like $Rosa$ $indica$).
$4$. Inferae is a series under Gamopetalae,not Polypetalae,and includes $Helianthus$ $annuus$ $(Asteraceae)$.
Since the question asks for the incorrect pair based on the classification of Polypetalae,$Catharanthus$ $roseus$ is incorrectly placed as it belongs to Gamopetalae.

(A) The classification provided refers to the Bentham and Hooker system of classification for Dicotyledons:
$1$. $(A)$ Inferae: Characterized by an inferior ovary. Example: Sunflower $(iii)$.
$2$. $(B)$ Heteromerae: Characterized by a superior ovary with more than two carpels. Example: Madhuca $(iv)$.
$3$. $(C)$ Bicarpellatae: Characterized by a superior ovary with two carpels. Example: Catharanthus $(v)$.
$4$. $(D)$ Thalamiflorae: Characterized by a superior ovary and thalamus with many stamens. Example: Hibiscus $(i)$.
$5$. $(E)$ Calyciflorae: Characterized by a perigynous or epigynous flower. Example: Rose $(vi)$.
Therefore,the correct matching is $(A-iii), (B-iv), (C-v), (D-i), (E-vi)$.

(A) The correct matches are as follows:
$A$. China rose (Hibiscus rosa-sinensis) matches with $iii$.
$B$. Lemon (Citrus limon) matches with $iv$.
$C$. Sunflower (Helianthus annuus) matches with $v$.
$D$. Onion (Allium cepa) matches with $ii$.
$E$. Bougainvillea (Bougainvillea spectabilis) matches with $i$.
Therefore,the correct sequence is $A-iii, B-iv, C-v, D-ii, E-i$.

(C) The correct matching is as follows:
$1$. $(A)$ China rose (Hibiscus): It has a dome-shaped thalamus with a superior ovary. Thus,$(A-r)$.
$2$. $(B)$ Lemon: It has a disc-shaped thalamus with a superior ovary. Thus,$(B-p)$.
$3$. $(C)$ Rose: It has a cup-shaped thalamus (perigynous flower). Thus,$(C-t)$.
$4$. $(D)$ Sunflower: It has an inferior ovary (epigynous flower). Thus,$(D-q)$.
$5$. $(E)$ Bougainvillea: It is characterized by the presence of a perianth (bracts are petaloid). Thus,$(E-s)$.
Therefore,the correct sequence is $(A-r), (B-p), (C-t), (D-q), (E-s)$.

(A) The correct scientific names for the given plants are as follows:
$1$. Hibiscus: $Hibiscus \, rosa-sinensis$ (iii)
$2$. Lemon: $Citrus \, limon$ (iv)
$3$. Sunflower: $Helianthus \, annuus$ $(v)$
$4$. Bougainvillea: $Bougainvillea \, spectabilis (i)$
$5$. Onion: $Allium \, cepa$ (ii)
Therefore, the correct matching is $(A)-(iii), (B)-(iv), (C)-(v), (D)-(i), (E)-(ii)$.

(D) Dicotyledonous plants (dicots) are characterized by several key features:
$1$. The embryo typically contains two cotyledons (seed leaves).
$2$. The leaves of dicots generally show reticulate venation,where veins form a network.
$3$. The floral parts in dicots are often pentamerous (in multiples of $5$) or tetramerous (in multiples of $4$).
Since all these statements describe the characteristics of dicots,the correct option is $(D)$.

(D) Monocots (Monocotyledons) are characterized by several key features:
$1$. The embryo possesses only a single cotyledon (seed leaf).
$2$. The leaves typically exhibit parallel venation.
$3$. The flowers are generally trimerous,meaning the floral parts are in multiples of three.
Since all these statements describe characteristics of monocots,the correct option is $(D)$.

(C) The classification system by Bentham and Hooker divides Dicotyledonae into three subclasses: Polypetalae, Gamopetalae, and Monochlamydeae.
Polypetalae is further divided into three series: Thalamiflorae, Disciflorae, and Calyciflorae.
$(1)$ Thalamiflorae consists of $6$ cohorts and many families.
$(2)$ Inferae belongs to Gamopetalae and is characterized by an inferior ovary $(P)$.
$(3)$ Disciflorae includes plants like $Citrus$ $limon$ $(S)$ which possess a disc-like thalamus.
$(4)$ Bicarpellatae belongs to Gamopetalae and is characterized by having two carpels $(Q)$.
Therefore, the correct matching is: $(1)-(R), (2)-(P), (3)-(S), (4)-(Q)$.

(B) The correct matches are as follows:
$(1)$ Hibiscus corresponds to $(R)$ Hibiscus rosa-sinensis.
$(2)$ Catharanthus roseus corresponds to $(S)$ Periwinkle (common name).
$(3)$ Bougainvillea corresponds to $(P)$ Bougainvillea spectabilis (scientific name).
$(4)$ Citrus limon corresponds to $(Q)$ Lemon (common name).
Therefore, the correct sequence is $(1)-(R), (2)-(S), (3)-(P), (4)-(Q)$.

(A) In the $Bentham$ and $Hooker$ classification system,the class $Dicotyledonae$ is divided into three subclasses: $Polypetalae$,$Gamopetalae$,and $Monochlamydeae$.
The subclass $Polypetalae$ is further divided into three series: $Thalamiflorae$,$Disciflorae$,and $Calyciflorae$.
$Hibiscus$ $rosa-sinensis$ (family $Malvaceae$) is placed in the series $Thalamiflorae$ because it has a thalamus that is not cup-shaped (it is convex or conical) and the flowers are hypogynous with free petals.
Statement $X$ is true,but Statement $Y$ is false because $Hibiscus$ does not have a cup-shaped thalamus (which is a characteristic of $Calyciflorae$) and its petals are free (polypetalous),not fused.

(A) The image provided shows a typical sunflower plant,which is a member of the family Asteraceae. It is characterized by its large,composite flower head. Therefore,the correct option is Sunflower.

(C) The plant shown in the figure is a sunflower (Helianthus annuus).
Sunflower belongs to the family Asteraceae.
It is a dicotyledonous plant,characterized by having two cotyledons in its seeds and reticulate venation in its leaves.

(D) The scientific name of maize (corn) is $Zea \text{ } mays$.
$Rana \text{ } tigrina$ is the scientific name of the Indian bullfrog.
$Periplaneta \text{ } americana$ is the scientific name of the American cockroach.
$Helianthus \text{ } annuus$ is the scientific name of the sunflower.

(C) The correct matches are as follows:
$(1)$ Asteraceae belongs to the series Inferae $(R)$ in the Bentham and Hooker system of classification.
$(2)$ Megascolecidae is a family of earthworms belonging to the order Opisthopora $(S)$.
$(3)$ Blattidae is the family of cockroaches belonging to the order Orthoptera $(P)$ (specifically Blattodea, often grouped under Orthoptera in older classifications).
$(4)$ Poaceae is a family of grasses belonging to the series Glumiflorae $(Q)$.
Therefore, the correct matching is $(1-R), (2-S), (3-P), (4-Q)$.

(B) The plants listed are $Indigofera$,$Sesbania$,$Salvia$,$Allium$,$Aloe$,mustard,groundnut,radish,gram,and turnip.
Stamens with different lengths in flowers are characteristic of specific families:
$1$. $Salvia$ (Family $Lamiaceae$): Exhibits didynamous condition (two long and two short stamens).
$2$. Mustard ($Brassica$ $campestris$): Exhibits tetradynamous condition (four long and two short stamens).
$3$. Radish ($Raphanus$ $sativus$): Exhibits tetradynamous condition (four long and two short stamens).
$4$. Turnip ($Brassica$ $rapa$): Exhibits tetradynamous condition (four long and two short stamens).
$Indigofera$,$Sesbania$,$gram$,and $groundnut$ (Family $Fabaceae$) have diadelphous stamens but generally uniform lengths.
$Allium$ and $Aloe$ (Family $Liliaceae$) have stamens of similar lengths.
Therefore,there are $4$ plants ($Salvia$,mustard,radish,and turnip) that have stamens with different lengths.

(C) The correct answer is $C$.
$1$. The pitcher of $Nepenthes$ (pitcher plant) is a modification of the leaf.
$2$. In $Nepenthes$,the leaf lamina is modified into a pitcher-like structure to trap and digest insects.
$3$. The leaf apex forms a lid to cover the pitcher,and the leaf base often becomes leaf-like (phyllode).
$4$. Tendrils of cucumber,flattened structures of $Opuntia$ (phylloclade),and thorns of citrus are all examples of stem modifications.

(D) The plants listed are China rose,mustard,brinjal,potato,guava,cucumber,onion,and tulip.
$1$. China rose: Superior ovary (Hypogynous flower).
$2$. Mustard: Superior ovary (Hypogynous flower).
$3$. Brinjal: Superior ovary (Hypogynous flower).
$4$. Potato: Superior ovary (Hypogynous flower).
$5$. Guava: Inferior ovary (Epigynous flower).
$6$. Cucumber: Inferior ovary (Epigynous flower).
$7$. Onion: Superior ovary (Hypogynous flower).
$8$. Tulip: Superior ovary (Hypogynous flower).
Thus,China rose,mustard,brinjal,potato,onion,and tulip have a superior ovary. The total count is $6$.

(C) The correct answer is $C$.
$1$. Onion ($Allium$ $cepa$) is a monocot belonging to the family $Liliaceae$. It stores food in fleshy leaves forming a bulb.
$2$. The aestivation in $Liliaceae$ (like Onion) is imbricate,where the margins of the sepals or petals overlap one another but not in any particular direction.
$3$. It exhibits axile placentation,where the placenta is axial and the ovules are attached to it in a multilocular ovary.
Analysis of other options:
- Pea: It has non-endospermic (exalbuminous) seeds,not endospermic.
- Tomato: It shows valvate aestivation,not twisted.
- Maize: It is a $C_4$ plant,not a $C_3$ plant.

(C) Marginal placentation is a characteristic feature of the family $Fabaceae$.
In the given list,the plants belonging to the family $Fabaceae$ are: Gram,Arhar,Sun hemp,Moong,Pea,and Lupin.
$1$. Gram ($Cicer$ $arietinum$)
$2$. Arhar ($Cajanus$ $cajan$)
$3$. Sun hemp ($Crotalaria$ $juncea$)
$4$. Moong ($Vigna$ $radiata$)
$5$. Pea ($Pisum$ $sativum$)
$6$. Lupin $(Lupinus)$
Therefore,there are $6$ plants that exhibit marginal placentation.
The correct option is $C$.