Flower Questions in English

(C) $Rafflesia$ $arnoldii$ is a parasitic plant known for producing the largest individual flower in the world.
The image displays the massive,fleshy,five-lobed structure which is the flower of this plant.
It lacks visible leaves,stems,or roots as it lives entirely within its host vine,emerging only to bloom.

(C) The plant shown in the figure is maize $(Zea \ mays)$.
Maize belongs to the family Poaceae (Gramineae),which is a monocotyledonous family.
Monocotyledonous plants typically have trimerous flowers,meaning the floral parts are in multiples of three.
Therefore,the correct option is $(C)$.

(B) The term 'polyadelphous' refers to the cohesion of stamens.
In this condition,the filaments of the stamens are fused together to form more than two bundles or groups,while the anthers remain free.
Since stamens constitute the androecium of a flower,this term is related to the androecium.
An example of this condition is found in $Citrus$.

(A) Radial symmetry,also known as actinomorphic symmetry,occurs when a flower can be divided into two equal radial halves in any radial plane passing through the center.
In the given options,$Brassica$ (mustard) exhibits actinomorphic (radial) symmetry.
In contrast,$Trifolium$,$Pisum$ (pea),and $Cassia$ exhibit zygomorphic (bilateral) symmetry,where the flower can be divided into two similar halves only in one particular vertical plane.

(A) The correct answer is $A$.
Free-central placentation occurs when the ovules are borne on a central axis and septa are absent.
This type of placentation is characteristic of plants like $Dianthus$ and $Primula$.
In contrast,$Argemone$ and $Brassica$ exhibit parietal placentation,where ovules develop on the inner wall of the ovary.
$Citrus$ exhibits axile placentation,where the placenta is axial and the ovules are attached to it in a multilocular ovary.

(A) : The posterior large bilobed petal of a papilionaceous corolla is called the standard or vexillum. It overlaps the two smaller lateral petals known as wings or alae.

(D) : Axile placentation occurs in syncarpous pistils. The ovary is partitioned into two or more chambers. Placentae occur in the central region where the septa meet so that an axile column bearing ovules is formed,$e.g.$,shoe flower (pentalocular),lemon (multilocular),etc.

(B) In perigynous flowers,the gynoecium is situated in the center and other floral parts are located on the rim of the thalamus almost at the same level.
In this condition,the ovary is said to be half-inferior.
Examples of perigynous flowers include $plum$,$rose$,and $peach$.
Therefore,the correct option is $(b)$.

(D) The flowers of the family $Fabaceae$ (subfamily $Papilionoideae$) exhibit a butterfly-shaped corolla,known as a papilionaceous corolla.
This arrangement consists of five petals: one posterior,large,outermost petal called the $standard$ or $vexillum$; two lateral petals called $wings$ or $alae$; and two anterior,fused petals called the $keel$ or $carina$.
The $keel$ petals enclose the stamens and the carpel.
This characteristic structure is found in plants like $Indigofera$,bean,gram,and pea.

(A) In a hypogynous flower,the gynoecium occupies the highest position,while the other floral parts (sepals,petals,and stamens) are situated below it. The ovary in such flowers is superior.
Plants with hypogynous flowers from the given list are: mustard,brinjal,China rose,lupin,sunhemp,gram,bean,chilli,petunia,tomato,Withania,potato,onion,aloe,and tulip.
Plants that are $NOT$ hypogynous are: bitter gourd (epigynous),pumpkin (epigynous),cucumber (epigynous),guava (epigynous),plum (perigynous),and rose (perigynous).
Counting the hypogynous plants: mustard $(1)$,brinjal $(2)$,China rose $(3)$,lupin $(4)$,sunhemp $(5)$,gram $(6)$,bean $(7)$,chilli $(8)$,petunia $(9)$,tomato $(10)$,Withania $(11)$,potato $(12)$,onion $(13)$,aloe $(14)$,and tulip $(15)$.
Therefore,there are $15$ plants with hypogynous flowers.

(C) The correct answer is $C$.
In China rose $(Hibiscus \text{ } rosa-sinensis)$, the flowers are actinomorphic, meaning they can be divided into two equal radial halves in any radial plane passing through the center.
They are hypogynous, meaning the gynoecium occupies the highest position, while the other floral parts (sepals, petals, and stamens) are situated below it.
They exhibit twisted aestivation, where one margin of each petal overlaps with the margin of the next petal in a regular pattern.

(B) The mode of arrangement of sepals or petals in a floral bud with respect to one another is termed as aestivation.
In valvate aestivation,the margins of sepals or petals touch each other at the edge without overlapping.
Among the given plants,the following exhibit valvate aestivation:
$1$. Calotropis
$2$. Tulip
$3$. Asparagus
$4$. Colchicum
$5$. Petunia
$6$. Mustard
$7$. Tobacco
Sesbania,sweet pea,Indigofera,soybean,and groundnut exhibit vexillary aestivation (papilionaceous corolla).
Therefore,there are $7$ plants with valvate aestivation.

(D) The correct answer is $D$.
Placentation refers to the arrangement of ovules within the ovary.
It is classified into several types:
$1$. Marginal: Found in pea.
$2$. Parietal: Found in mustard and Argemone.
$3$. Axile: Found in China rose,tomato,and lemon.
$4$. Free central: Found in Dianthus and Primrose.
Therefore,tomato and lemon exhibit axile placentation.

(D) The gynoecium is the female reproductive part of a flower.
When the pistils are free,the condition is called apocarpous,as seen in $Michelia$.
When the pistils are fused together,the condition is called syncarpous,as seen in $tomato$ and $Papaver$.

(D) : $A$ flower is defined as a modified shoot wherein the shoot apical meristem changes into a floral meristem. Internodes do not elongate and the axis gets condensed. The apex produces different kinds of floral appendages laterally at successive nodes instead of leaves. Thus,the flower is a modified shoot. In tomato,the fruit is a berry. Orchid seeds are non-endospermic (exalbuminous). Placentation in primrose is free-central.

(B) : Flowers of gulmohur exhibit bilateral symmetry,which means they can be divided into two identical halves only in one particular vertical plane. Therefore,they are classified as zygomorphic. In contrast,Datura,mustard,and tomato possess actinomorphic flowers,which exhibit radial symmetry and can be divided into two identical halves in any radial plane passing through the center.

(A) In perigynous flowers,the gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level.
In this condition,the ovary is said to be half inferior.
Examples of perigynous flowers include $plum$,$rose$,and $peach$.
Therefore,the correct option is $A$.

(B) The correct answer is $B$. In basal placentation,the placenta develops at the base of the ovary,and a single ovule is attached to it. This type of placentation is commonly observed in families like $Asteraceae$ (formerly $Compositae$) and $Poaceae$.

(D) The flowers of the family $Fabaceae$ (subfamily $Papilionoideae$) exhibit a butterfly-shaped corolla,known as $papilionaceous$ corolla.
This arrangement consists of five petals: one large posterior petal called the $standard$ or $vexillum$,two lateral petals called $wings$ or $alae$,and two anterior petals that are fused to form the $keel$ or $carina$.
The $keel$ encloses the stamens and the carpel.
This specific type of aestivation is characteristic of plants like $bean$,$gram$,$pea$,and $Indigofera$.

(B) : If the gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level,it is called perigynous. The ovary here is said to be half-inferior,e.g.,plum,rose,and peach.

(A) : China rose of Family $Malvaceae$ possesses numerous stamens.
The filaments of the stamens are united into a single bundle or group, forming a staminal tube around the style.
Such a condition of stamens is technically termed as monadelphous.

(C) In axile placentation,the placenta develops from the central axis of the ovary,and the ovules are attached to it in a multilocular ovary.
Examples of axile placentation include $Lemon$,$China$ $rose$,and $Tomato$.
$Dianthus$ shows free central placentation,$Marigold$ shows basal placentation,and $Argemone$ shows parietal placentation.

(D) : Replum is a false septum formed due to the ingrowth of parietal placenta. This makes the ovary bilocular. It is a characteristic feature of the ovary of flowers in the $Brassicaceae$ (Cruciferae) family,for example,mustard,candytuft,etc.

(D) The correct answer is $(d)$. In cucumber,flowers are unisexual,meaning individual flowers are either male (staminate) or female (pistillate). Both types of flowers are present on the same plant,making it a monoecious plant. In contrast,China rose,onion,and pea possess bisexual (hermaphrodite) flowers.

(B) The given figure represents the multicarpellary,apocarpous gynoecium of Michelia.
In Michelia,the gynoecium consists of many separate carpels (apocarpous condition),which are arranged on the thalamus.
Therefore,the correct option is $B$.

(B) The question regarding the number of carpels in biennial plants is biologically ambiguous because the number of carpels is a characteristic feature of a specific plant family or genus,not a general characteristic of the life cycle duration (biennial). However,in many standard botanical contexts or specific textbook questions referring to this,it is often associated with specific examples like the Brassicaceae family (e.g.,biennial varieties of radish or cabbage),which typically possess two carpels (bicarpellary). Therefore,$B$ is the most scientifically plausible answer in the context of common biennial crops.

(D) In sunflower $(Helianthus \text{ } annuus)$, the ovary is unilocular and contains a single ovule attached at the base of the ovary. This type of arrangement is known as basal placentation.

(B) In perigynous flowers,the gynoecium is situated in the center and other parts of the flower are located on the rim of the thalamus almost at the same level.
Examples of perigynous flowers include $Rose$,$Plum$,and $Peach$.
In $Guava$ and $Cucumber$,the ovary is inferior (epigynous).
In $Mustard$,$China$ $rose$,and $Brinjal$,the ovary is superior (hypogynous).

(A) Based on the morphological structure of a flower:
$1$. $X$ points to the stalk of the flower, which is the $\text{Pedicel}$.
$2$. $Y$ points to the central female reproductive part, which is the $\text{Gynoecium}$ (specifically the style/stigma region).
$3$. $Z$ points to the leaf-like outer whorl, which is the $\text{Calyx}$ (sepals).
Therefore, the correct identification is $X = \text{Pedicel}, Y = \text{Gynoecium}, Z = \text{Calyx}$.

(B) In basal placentation,the placenta develops at the base of the ovary and a single ovule is attached to it.
This type of placentation is characteristic of the families $Asteraceae$ (e.g.,$Sunflower$,$Marigold$) and $Poaceae$.
In $Calotropis$,the placentation is marginal.
In $Lemon$,the placentation is axile.
In $Pea$,the placentation is marginal.
Therefore,the correct answer is $Sunflower$.

(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 $Cassia$,the margins of sepals or petals overlap one another but not in any particular direction,which is known as Imbricate aestivation.
In $Calotropis$,the sepals or petals in a whorl just touch one another at the margin,without overlapping,which is known as Valvate aestivation.
Therefore,the correct sequence for $Cassia$ and $Calotropis$ is Imbricate and Valvate respectively.

(B) Mustard $(Brassica \text{ } campestris)$ belongs to the family $Brassicaceae$.
$1$. Flowers in mustard are actinomorphic (radially symmetrical), not zygomorphic.
$2$. The ovary is superior, and other floral parts are situated below the ovary, making the flower hypogynous.
$3$. The fruit of mustard is a siliqua, which is a dry dehiscent fruit, not a fleshy fruit.
$4$. Mustard flowers typically have $6$ stamens (androecium) arranged in two whorls $(2+4)$, not five.
Therefore, the correct statement is that it has hypogynous flowers.

(D) The calyx (sepals) and the corolla (petals) are the two accessory whorls of a flower.
In both whorls,the individual members (sepals in calyx and petals in corolla) can be either free (polysepalous/polypetalous) or united (gamosepalous/gamopetalous).
Option $A$ is incorrect because they are accessory (outer) whorls,not inner.
Option $B$ is incorrect because the corolla is usually brightly colored,not green.
Option $C$ is incorrect because the calyx is typically green and protective,not primarily for attracting insects.

(C) In basal placentation,the placenta develops at the base of the ovary and a single ovule is attached to it.
This type of placentation is characteristic of the families Asteraceae (Compositae) and Poaceae.
Among the given options,Marigold and Sunflower belong to the family Asteraceae,which exhibits basal placentation.
Therefore,the correct answer is $C$.

(A) When the stamens (androecium) are attached to the petals (corolla),the condition is known as epipetalous.
This condition is characteristic of the family $Solanaceae$.
Among the given options,$Brinjal$ ($Solanum$ $melongena$) belongs to the family $Solanaceae$.
Therefore,the androecium is fused with the corolla in $Brinjal$.

(A) Placentation is defined as the arrangement of ovules within the ovary of a flower.
It plays a crucial role in the development of seeds and fruits.
Different types of placentation include marginal,axile,parietal,basal,central,and free central.

(D) In $Axile$ placentation,the placenta is axial and the ovules are attached to it in a multilocular ovary.
This type of placentation is characteristic of plants like China rose ($Hibiscus$ $rosa-sinensis$),tomato ($Solanum$ $lycopersicum$),and lemon.
Therefore,the correct option is $D$.

(B) In floral formulas,the symbol $G$ represents the gynoecium (ovary).
When a horizontal line is placed below the letter $G$ (i.e.,$\underline G$),it indicates that the ovary is superior.
$A$ superior ovary is one where the gynoecium occupies the highest position while the other floral parts (sepals,petals,and stamens) are situated below it.
This condition is known as hypogyny.

(A) In flowering plants,the arrangement of stamens based on the fusion of filaments is classified as follows:
$1$. Monadelphous: Filaments are united into a single bundle (e.g.,China rose).
$2$. Diadelphous: Filaments are united into two bundles (e.g.,Pea,Soyabean).
$3$. Polyadelphous: Filaments are united into more than two bundles (e.g.,Lemon/Citrus).
Therefore,the correct answer is Lemon.

(B) 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.
$1$. Valvate: When sepals or petals in a whorl just touch one another at the margin,without overlapping,as in Calotropis.
$2$. Twisted: If one margin of the appendage overlaps that of the next one and so on,as in China rose,lady's finger,and cotton.
$3$. Imbricate: If the margins of sepals or petals overlap one another but not in any particular direction,as in Cassia and Gulmohur.
$4$. Vexillary (Papilionaceous): In pea and bean flowers,there are five petals; the largest (standard) overlaps the two lateral petals (wings),which in turn overlap the two smallest anterior petals (keel).
Therefore,the correct pair is Twisted - Lady's finger.

(A) In a hypogynous flower,the gynoecium occupies the highest position while the other parts (sepals,petals,and stamens) are situated below it.
Therefore,the ovary is said to be superior.
Examples of hypogynous flowers include mustard,China rose,and brinjal.

(C) flower is said to be zygomorphic if it can be divided into two similar halves only in one particular vertical plane. This is also known as bilateral symmetry.
Examples of zygomorphic flowers include Pea,Bean,Gulmohar,and Cassia.
Actinomorphic flowers are those that can be divided into two equal radial halves in any radial plane passing through the center. This is also known as radial symmetry.
Datura,Mustard,and Chilli are examples of plants with actinomorphic flowers.
Therefore,Datura does not have a zygomorphic flower; it has an actinomorphic flower.

(D) In perigynous flowers,the gynoecium is situated in the center and other parts of the flower are located at the rim of the thalamus almost at the same level. The ovary is said to be half-inferior. Examples include $Rose$,$Peach$,and $Plum$.

(A) In flowering plants,when carpels are fused together,the condition is known as syncarpous.
Examples of syncarpous ovaries include tomato and mustard.
In contrast,when carpels are free,the condition is known as apocarpous,as seen in lotus and rose.
Therefore,the correct option is $A$.

(C) Aestivation is the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl.
$1$. Valvate: When sepals or petals in a whorl just touch one another at the margin,without overlapping (e.g.,Calotropis).
$2$. Twisted: If one margin of the appendage overlaps that of the next one and so on (e.g.,China rose,lady's finger,and cotton).
$3$. Imbricate: If the margins of sepals or petals overlap one another but not in any particular direction (e.g.,Cassia and Gulmohar).
$4$. Vexillary: In pea and bean flowers,there are five petals; the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel). This is also known as papilionaceous aestivation.
Therefore,the correct answer is Imbricate.

(B) Petals are the components of the corolla,which is the second whorl of a flower.
Their primary function is to attract insects and other pollinators by their bright colors and scent,thereby facilitating the process of pollination.
Option $A$ is incorrect because petals are usually brightly colored,not just green.
Option $C$ is incorrect because the number of petals varies across different plant species.
Option $D$ is incorrect because petals are located outside the reproductive organs (androecium and gynoecium).

(D) Aestivation is the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl.
$1$. Valvate: Sepals or petals in a whorl just touch one another at the margin,without overlapping,e.g.,Calotropis.
$2$. Twisted: One margin of the appendage overlaps that of the next one and so on,e.g.,China rose,lady's finger,and cotton.
$3$. Imbricate: The margins of sepals or petals overlap one another but not in any particular direction,e.g.,Cassia and Gulmohur.
$4$. Vexillary (Papilionaceous): In pea and bean flowers,there are five petals; the largest (standard) overlaps the two lateral petals (wings),which in turn overlap the two smallest anterior petals (keel). China rose shows twisted aestivation,not vexillary. Therefore,the pair 'Vexillary - China rose' is incorrect.

(C) The correct matches for placentation types are as follows:
$(1)$ Marginal placentation: The placenta forms a ridge along the ventral suture of the ovary,as seen in $Pea$ $(r)$.
$(2)$ Axile placentation: The placenta is axial and ovules are attached to it in a multilocular ovary,as seen in $Lemon$ $(s)$.
$(3)$ Parietal placentation: The ovules develop on the inner wall of the ovary or on peripheral parts,as seen in $Argemone$ $(p)$.
$(4)$ Free central placentation: The ovules are borne on the central axis and septa are absent,as seen in $Dianthus$ $(q)$.
Therefore,the correct matching is $(1-r), (2-s), (3-p), (4-q)$.

(A) In epigynous flowers,the margin of the thalamus grows upward enclosing the ovary completely and getting fused with it,while other parts of the flower arise above the ovary. The ovary is said to be inferior in such flowers. Examples of epigynous flowers include Guava,Cucumber,and the ray florets of Sunflower.

(C) In some flowers,like the lily,the calyx and corolla are not distinct and are termed as the perianth.
When the sepals and petals are not distinguishable,they are collectively referred to as the perianth.
Each individual member of the perianth is called a tepal.