Economic Botany Questions in English

(B) The Cotton Technology Research Laboratory (now known as the Central Institute for Research on Cotton Technology or $CIRCOT$) is located in Matunga,Mumbai (formerly Bombay). It was established to conduct research on cotton and its by-products.

(A) Jute is known as the 'Golden Fibre' and is the most important fibre crop grown in the eastern region of India,particularly in West Bengal,Bihar,and Assam.
It thrives in the hot and humid climate of the Ganges-Brahmaputra delta,which provides the ideal alluvial soil and abundant water required for its cultivation and retting process.

(B) The Central Research Institute for Jute and Allied Fibers, known as the Jute Agricultural Research Institute $(JARI)$, is located in Barrackpore, West Bengal.
West Bengal is the primary jute-producing state in India, making it the ideal location for this research facility.
Therefore, the correct option is $(b)$.

(D) The old world cotton species,$Gossypium \, arboreum$ and $G. herbaceum$,are diploid species with a chromosome number of $2n = 26$.
These are often referred to as $A$-genome diploids.
In contrast,the new world cotton species,$Gossypium \, hirsutum$ and $G. barbadense$,are allotetraploid species with a chromosome number of $2n = 4x = 52$.
Therefore,the correct genomic constitution is old world $2n$ and new world $4n$.

(B) Linen is a textile made from the fibres of the flax plant, $Linum \text{ } usitatissimum$.
Cambric is a lightweight, closely woven fabric, originally made from flax linen.
Therefore, both linen and cambric are derived from flax fibres.

(B) Patsan,also known as Kenaf,is a bast fibre obtained from the stem of the plant $Hibiscus \ cannabinus$.
It belongs to the family $Malvaceae$.
This fibre is widely used for making ropes,cordage,and paper pulp.

(C) Rayon is a regenerated cellulose fiber. It is produced by chemically processing natural cellulose,which is typically obtained from wood pulp or cotton linters. The cellulose is dissolved in a chemical solution (such as carbon disulfide and sodium hydroxide) to form a viscous liquid called viscose,which is then extruded through a spinneret into an acid bath to form solid filaments.

(C) Morphologically,flax fibres are obtained from the pericycle of the stem.
These fibres are bast fibres,which are known for being stronger and more durable than cotton fibres.

(B) Cotton is a soft,fluffy staple fiber that grows in a boll,or protective case,around the seeds of the cotton plants of the genus $Gossypium$.
$Gossypium herbaceum$ is a species of cotton known as Levant cotton,which is one of the primary sources of commercial cotton fiber.
$Calotropis procera$ is known for its latex and fiber (madar),$Cannabis sativa$ is the source of hemp fiber,and $Crotoleria juncea$ is the source of sunn hemp.

(A) Cotton fibre is considered the purest natural form of cellulose, containing approximately $90\%$ cellulose.
While flax and sunn hemp also contain cellulose, they are bast fibres that contain significant amounts of lignin, pectin, and hemicellulose associated with the cell walls.
Therefore, cotton is the most accurate answer among the choices provided as it is nearly pure cellulose.

(D) Flax fibre is a type of bast fibre or phloem fibre obtained from the stem of the plant $Linum \text{ } usitatissimum$.
It is a member of the family $Linaceae$.
These fibres are known for their strength and are widely used in the textile industry for making linen fabric.
$Cannabis \text{ } sativa$ provides hemp fibre, $Crotolaria \text{ } juncea$ provides sunn hemp, and $Cocos \text{ } nucifera$ provides coir fibre.

(B) The correct answer is $B$. Cotton fibres are unicellular trichomes that originate from the epidermal cells of the seed coat of the cotton plant $(Gossypium)$. These are distinct from bast fibres like jute,which are phloem-derived.

(B) $Cocos$ $nucifera$ (Coconut) belongs to the family $Arecaceae$ (formerly $Palmae$).
It is a monocotyledonous plant,and its coir fibres are obtained from the mesocarp of the fruit.

(B) Sunn hemp,scientifically known as $Crotalaria\, juncea$,is a plant species that belongs to the family $Leguminosae$ (also known as $Fabaceae$).
It is widely cultivated for its fiber,which is used in the production of ropes,twines,and paper.
Therefore,the correct option is $B$.

(C) The $Cotton$ plant $(Gossypium)$ is a versatile crop that yields several utilizable products.
$1$. Fibres are obtained from the seed surface (lint).
$2$. Fatty oil is extracted from the kernels.
$3$. The oil cake remaining after oil extraction is used as high-protein animal feed.
$4$. Additionally, it is used in the production of plastics, rayon, and explosives.

(C) Commercial jute is obtained from the phloem tissue of the stem of the jute plant ($Corchorus$ species).
These fibres are commonly known as bast fibres.
Bast fibres are sclerenchymatous fibres found in the phloem of dicotyledonous plants, which provide mechanical support to the plant.
Therefore, "Commercial jute" is morphologically a bast fibre.

(A) Jute is a bast fiber obtained from plants of the genus $Corchorus$.
These plants belong to the family $Tiliaceae$ (also known as the $Malvaceae$ family in some modern classification systems,but $Tiliaceae$ is the traditional and specific family for Jute).
Therefore,the correct option is $A$.

(A) $Corchorus$ (commonly known as Jute) is a significant fibre-yielding plant.
It belongs to the family $Malvaceae$ (or $Tiliaceae$ in older classifications).
The fibres obtained from the stem of $Corchorus$ are used for making ropes,bags,and various textiles.
$Cedrus$ is a genus of coniferous trees,$Fragaria$ is the genus for strawberries,and $Bambusa$ is a genus of bamboo.

(C) The National Newsprint and Paper Mills Limited,commonly known as Nepanagar,is located in the Burhanpur district of Madhya Pradesh,India.
It was the first newsprint mill in India,established in $1947$.
It is famous for being the largest producer of newsprint in the country.

(B) Hemp fibres are bast fibres obtained from the stem of the plant $Cannabis \text{ } sativa$.
These fibres are known for their strength and durability and are widely used in the production of ropes, textiles, and paper.
$Corchorus$ is the source of jute fibres, $Linum$ is the source of flax fibres, and $Hibiscus$ is known for its ornamental and medicinal properties.

(C) Bamboo is a type of grass that thrives in various climates,but it is most commonly associated with tropical and subtropical regions. It is a characteristic species found in $Deciduous$ forests,where it grows in abundance due to the favorable moisture and temperature conditions.

(B) $Coir$ is the fibrous material found between the hard,internal shell and the outer coat of a coconut.
It is obtained from the mesocarp of the fruit of $Cocos$ $nucifera$ (coconut palm).
Therefore,the husk fibres obtained from dry coconut are known as $Coir$.

(A) Sunn hemp is a bast fibre crop belonging to the family $Fabaceae$.
It is scientifically known as $Crotalaria \text{ } juncea$.
This plant is primarily cultivated for its fibre, which is used in the manufacturing of ropes, twines, and paper.
Therefore, the correct option is $A$.

(C) The plant described is $Gossypium$ $herbaceum$,commonly known as cotton.
Cotton fibers are epidermal outgrowths of the seed coat (testa).
These hairs are composed primarily of cellulose.
They are extensively used in the textile industry for making cloth and in the paper industry for producing high-quality,durable paper.

(B) The family $Malvaceae$ includes plants like cotton $(Gossypium)$, which is a major source of textile fibre.
The family $Leguminosae$ (specifically the subfamily $Papilionoideae$) includes plants like $Crotalaria \text{ } juncea$ (Sunn hemp), which is a well-known source of bast fibre.
Therefore, both $Malvaceae$ and $Leguminosae$ are families that yield economically important fibres.

(D) Fibres are structural components of plants that provide mechanical support and are used commercially. They are obtained from various plant tissues including xylem (wood fibres),phloem (bast fibres),epidermis (surface fibres like cotton),sclerenchyma,fruit walls (mesocarp),pericycle,and seed surfaces. Therefore,option $D$ is the most comprehensive choice among the given alternatives.

(B) The correct answer is $B$.
Surface fibres are epidermal outgrowths of the seed coat.
$Gossypium$ (cotton) is the most important source of commercial surface fibres.
These fibres are widely used in the textile industry,as well as in the production of explosives,rayon,and plastics.

(A) Bast fibres are phloem fibres obtained from the phloem tissue of dicotyledonous plants.
$Corchorus$ $(Jute)$ is a classic example of a plant that provides bast fibres.
These fibres are located in the stem and are used commercially for making ropes,bags,and textiles.
Therefore,the correct option is $A$.

(D) Gujarat is the largest producer of cotton in India. It accounts for a significant portion of the total cotton production in the country due to its favorable black soil and climatic conditions.

(B) The coconut fruit is a fibrous drupe.
In a drupe,the pericarp is differentiated into three layers: the outer epicarp,the middle mesocarp,and the inner endocarp.
The husk of the coconut,which provides the coir fibre,is derived from the fibrous mesocarp.
Therefore,the correct answer is the mesocarp.

(B) West Bengal is the largest producer of jute in India.
It accounts for more than $70\%$ of the total jute production in the country due to its favorable alluvial soil and humid climate,which are ideal for the cultivation of this fiber crop.

(C) $Silk$ is not a plant fibre because it is an animal fibre obtained from the cocoons of the silk moth ($Bombyx$ $mori$).
In contrast, $Flax$, $Coir$, and $Hemp$ are all natural fibres derived from various parts of plants.

(B) Cotton fibres are obtained from the surface of the seeds of the cotton plant $(Gossypium)$.
These fibres are epidermal outgrowths of the seed coat,which are primarily composed of cellulose.
Therefore,the maximum amount of cellulose fibre is obtained from the seed hairs.

(D) Cotton,scientifically known as $Gossypium$,belongs to the family $Malvaceae$.
This family is characterized by plants with mucilaginous sap and often showy flowers.
$Solanaceae$ includes plants like potato and tomato.
$Leguminosae$ (or $Fabaceae$) includes pulses and beans.
$Cucurbitaceae$ includes gourds and pumpkins.

(C) . Sunn hemp fibres are obtained from the phloem and pericycle tissues of the plant $Crotalaria$ $\text{juncea}$. These bast fibres are commercially significant and are used in the manufacturing of coarse cloth, ropes, and twine.

(A) $Hibiscus$ $sabdariffa$,commonly known as Roselle,is a source of bast fiber.
Bast fibers are structural fibers found in the phloem (inner bark) of dicotyledonous plants.
Specifically,the 'Patua' fiber is obtained from the secondary phloem of the stem.
Therefore,the correct option is $A$.

(A) Cotton fibres are unicellular hairs that grow from the surface of the seed coat of the cotton plant $(Gossypium)$.
Since these fibres originate from the epidermis of the seed,they are classified as surface fibres.

(B) Jute is a bast fiber obtained from the stem of plants belonging to the genus $Corchorus$.
Specifically,the fibers are extracted from the secondary phloem (also known as the inner bark or bast) of the stem.
Therefore,the correct option is $B$.

(B) The botanical name of cotton belongs to the genus $Gossypium$. It is a member of the family $Malvaceae$. $Brassica$ refers to mustard, $Hibiscus$ is a related genus (e.g., $Hibiscus$ $rosa-sinensis$), and $Iberis$ is commonly known as candytuft.

(A) Cotton fibers are composed of approximately $90\%$ cellulose,which is the highest concentration of cellulose found in any natural plant fiber.
Other plant fibers like coir,hemp,and flax contain lower percentages of cellulose and higher amounts of lignin or other components compared to cotton.

(C) Phloem fibres,also known as bast fibres,are sclerenchymatous cells that provide mechanical support to the phloem tissue.
These fibres are generally absent in primary phloem but are commonly found in secondary phloem.
They are commercially important and are used in the production of ropes,mats,and fabrics.

(C) The long fibres of cotton are known as $Lint$.
Small,short fibres that remain attached to the seed after ginning are known as $Fuzz$.
$Lint$ is commercially extractable and used for textile production,whereas $Fuzz$ is generally non-extractable for spinning purposes.

(D) Cotton fibres are epidermal outgrowths of the seed coat,specifically known as the $Testa$. These are unicellular,elongated hairs that arise from the surface of the seed. Therefore,cotton fibres are derived from the $Testa$.

(B) Cotton fibres are derived from the epidermal outgrowths of the seed coat of the cotton plant $(Gossypium)$. These are unicellular,elongated hairs that develop from the surface of the seeds. Therefore,they are classified as epidermal hairs of seeds.

(D) The fibers of $Cotton$ are derived from the epidermal outgrowths of the seed coat (testa). These are unicellular, elongated hairs that are commercially important for the textile industry. In contrast, $Coconut$ fibers are derived from the mesocarp, while $Jute$ and $Banana$ fibers are obtained from the stem or leaf tissues (bast fibers).

(B) Jute is a bast fiber obtained from the phloem of the plant $Corchorus$ species.
These fibers are primarily composed of cellulose,hemicellulose,and lignin.
Lignin is a complex organic polymer that provides structural support and rigidity to the plant cell walls,making the jute fiber strong and durable.
Therefore,among the given options,lignin is the correct component associated with the structural composition of jute fibers.

(B) Textile fibres are obtained from various plant sources.
$Crotolaria$ $juncea$ (Sunn hemp),$Gossypium$ $herbaceum$ (Cotton),and $Hibiscus$ $cannabinus$ (Kenaf) are all well-known sources of textile fibres.
However,in the context of standard botanical questions where multiple options are correct,$Gossypium$ $herbaceum$ is the most widely recognized primary source of natural textile fibre (cotton) globally.
$Cassia$ $occidentalis$ is not a source of textile fibre.

(C) Cultivated cotton is obtained from four species of the genus $Gossypium$.
These four species are:
$1$. $Gossypium$ $\text{arboreum}$
$2$. $Gossypium$ $\text{herbaceum}$
$3$. $Gossypium$ $\text{hirsutum}$
$4$. $Gossypium$ $\text{barbadense}$
Among these, $G.$ $\text{arboreum}$ and $G.$ $\text{herbaceum}$ are diploid $(2n)$, while $G.$ $\text{hirsutum}$ and $G.$ $\text{barbadense}$ are tetraploid $(4n)$.

(B) The botanical name of jute is $Corchorus \ capsularis$.
$Linum \ usitatissimum$ is the botanical name for flax.
$Hibiscus \ sabdariffa$ is known as roselle.
$Crotalaria \ juncea$ is the botanical name for sunn hemp.