Economic Botany Questions in English

(A) $Cannabis \text{ } sativa$ (hemp) is a well-known fibre-yielding plant.
It belongs to the family $Cannabaceae$.
The fibres obtained from the stem of this plant are used in the production of ropes, textiles, and paper.
$Cicer \text{ } arietinum$ is chickpea (a pulse crop) and $Triticum \text{ } vulgare$ is wheat (a cereal crop).

(A) $G. hirsutum$ and $G. barbadense$ are tetraploid species of cotton,commonly known as New World cotton. They originated in the Americas and are widely cultivated for their high-quality fiber.

(D) The coir industry in India is primarily concentrated in the state of $Kerala$.
This is due to the abundant availability of coconut husks,which are the raw material for coir production,as $Kerala$ is the largest producer of coconuts in India.
The coastal climate and the presence of backwaters facilitate the retting process of coconut husks,which is essential for extracting coir fibers.

(C) Manila hemp,also known as abaca,is a species of banana native to the Philippines. Its botanical name is $Musa \text{ } textilis$. It is a commercially important fiber crop.

(B) Cotton fibres are unicellular hairs that originate from the epidermis of the seed coat of the cotton plant $(Gossypium)$.
These fibres are of great commercial importance in the textile industry.
Flax,hemp,and coir are bast fibres or sclerenchymatous fibres derived from the phloem or other tissues,not the epidermis.

(D) The family $Malvaceae$ includes several plants of high economic value:
$1$. $Gossypium$ $hirsutum$ (Upland cotton) is the primary source of cotton fiber.
$2$. $Hibiscus$ $cannabinus$ (Kenaf) is used for the production of paper and cordage fibers.
$3$. $Abelmoschus$ $esculentus$ (Okra/Lady's finger) is a widely consumed vegetable.
Since all these plants belong to the family $Malvaceae$ and have significant economic importance,the correct answer is $D$.

(B) The correct answer is $B$. Cotton is the most widely cultivated fibre crop in India. India is one of the largest producers of cotton in the world,contributing significantly to global production. It is primarily cultivated in states like Gujarat,Maharashtra,Punjab,and Haryana,which provide the suitable black soil and climatic conditions required for its growth.

(D) Jute fibre is a lignocellulosic fibre.
Lignin is a complex organic polymer that provides structural support and resistance to microbial degradation.
Jute fibre contains a significant amount of lignin.
However,the question refers to the susceptibility of jute to deterioration (rotting) in humid conditions.
Actually,jute is known for being relatively durable,but compared to other bast fibres,its degradation is influenced by its chemical composition.
Specifically,a lower lignin content in certain varieties or conditions makes the fibre more susceptible to microbial attack,as lignin acts as a protective barrier against enzymatic breakdown of cellulose.

(A) $Cocos\, nucifera$ (Coconut) is a plant that yields both oil and fibre.
$1$. Oil: Coconut oil is extracted from the endosperm (copra) and is widely used for cooking,hair care,and industrial purposes.
$2$. Fibre: Coir fibre is extracted from the fibrous husk (mesocarp) of the coconut fruit and is used to make ropes,mats,and brushes.

(C) Fibres are a type of sclerenchyma cells. They are characterized by being elongated,narrow,and having thick,lignified cell walls. They typically have a very small lumen (cavity) and pointed ends,which provide mechanical support and strength to the plant.

(D) Jute fibres are obtained from the secondary phloem of the stem of the plant $Corchorus$ $capsularis$ and $Corchorus$ $olitorius$.
These fibres are commercially known as bast fibres because they are derived from the phloem tissue of the stem.
Therefore,the correct option is $D$.

(C) Oils are complex chemical compounds. Fatty oils (lipids) are primarily triglycerides (esters of glycerol and fatty acids),while essential oils are complex mixtures of volatile compounds,including terpenes,which are hydrocarbons. Since both categories contain hydrocarbon chains or structures,they are classified as such in a broad chemical context.

(C) . Khus oil ($Vetiveria\ zizanioides$,family $Gramineae$) is obtained from the root and rhizome.
It is widely used in the food industry for preparing and flavoring fruit juices,ice creams,and various beverages.

(A) Camphor (Kapoor) is obtained from the wood of the $Cinnamomum$ $camphora$ tree,which belongs to the family $Lauraceae$.
It is widely used in the production of perfumes,incense,and various medicinal preparations.

(B) Fixed oils are also known as fatty oils.
These oils are non-volatile,meaning they do not evaporate when exposed to air.
In contrast,essential oils are volatile and evaporate easily at room temperature.
Therefore,the correct answer is $(b)$.

(D) Linseed oil,Tung oil,and Soybean oil are all classified as drying oils.
These oils contain high levels of polyunsaturated fatty acids,which allow them to undergo oxidative polymerization when exposed to air.
This property makes them ideal for the production of paints,varnishes,and printing inks,as they form a durable,protective film upon drying.

(C) Hemp oil is extracted from the seeds of the hemp plant $(Cannabis \text{ } sativa)$.
The seeds are cold-pressed to extract the oil, which is rich in essential fatty acids like omega-$3$ and omega-$6$.
Unlike other parts of the plant, the seeds contain negligible amounts of cannabinoids like $THC$.

(B) Castor ($Ricinus\, communis$; family-$Euphorbiaceae$) oil is used as a purgative.
It acts as an excellent lubricant for the digestive tract and is non-edible.

(A) The oil obtained from the seeds of $Ricinus$ $communis$ (Castor oil plant) contains ricin,which is a highly toxic protein.
It acts as a strong purgative (laxative) when consumed in specific doses.
$Arachis$ $hypogea$ (Groundnut) is an edible oil,and $Jatropha$ $curcus$ is primarily used for biodiesel production,though it contains toxic compounds,$Ricinus$ $communis$ is the classic example of a poisonous purgative oil.

(B) The fruit pulp of $Olea$ $europaea$ (Olive) is a well-known source of commercial olive oil.
$Arachis$ $hypogaea$ (Groundnut) yields oil from its seeds.
$Ricinus$ $communis$ (Castor) yields oil from its endosperm (seeds).
$Linum$ $usitatissimum$ (Linseed) yields oil from its seeds.

(B) $Madhuca\,indica$ (Mahua),belonging to the family $Sapotaceae$,is widely known for its oil which is used in the preparation of soaps and detergents.
In many rural areas,the oil extracted from its seeds is also used for cooking and lighting purposes.

(D) Fatty oils are also known as fixed oils because they do not evaporate upon exposure to air.
Based on their ability to absorb oxygen and form a thin film when exposed to air,fatty oils are classified into $3$ types:
$1$. Drying oils (e.g.,linseed oil)
$2$. Semidrying oils (e.g.,cotton seed oil)
$3$. Non-drying oils (e.g.,castor oil,groundnut oil).
Therefore,all the given options are correct.

(A) Peppermint oil is an essential oil extracted from the leaves of the plant $Mentha \, piperita$ (family $Labiatae$). At room temperature,peppermint oil exists in a liquid state. Therefore,the correct option is $A$.

(C) $Arachis \text{ } hypogaea$ is the scientific name for groundnut or peanut.
Vegetable ghee is produced through the process of hydrogenation of vegetable oils.
Since groundnut oil is extracted from the seeds of $Arachis \text{ } hypogaea$, it is this oil that undergoes hydrogenation to form vegetable ghee.
Therefore, the oil of seeds is the correct component used in this process.

(A) $Mentha \ piperita$,commonly known as peppermint,belongs to the family $Lamiaceae$ (formerly known as $Labiatae$).
This family is characterized by square stems and opposite leaves,and it includes many aromatic plants.

(B) drupe is a type of fruit in which an outer fleshy part surrounds a single shell (the pit,stone,or pyrene) with a seed inside.
$Cocos \ nucifera$ (Coconut) is a well-known drupe that contains a significant amount of oily endosperm,which is used for oil extraction.
In contrast,the endosperm in Mango $(Mangifera \ indica)$ is consumed by the developing embryo,and the seed is not primarily known for oil production in the same way as coconut.
Therefore,the correct answer is $Cocos \ nucifera$.

(C) The correct answer is $(c)$. Til or Sesame ($Sesamum \, indicum$; family: $Pedaliaceae$) oil is obtained from its seeds. It is widely used in cooking and is traditionally believed to be beneficial for mental weakness and improving memory.

(A) Castor oil,derived from the seeds of the $Ricinus \ communis$ plant,is widely used as a lubricant for leather products.
It possesses excellent lubricating properties and helps in maintaining the softness and flexibility of leather.
Therefore,Castor seed oil is the correct answer.

(D) Non-drying oils are oils that do not form a hard,dry film when exposed to air.
These oils remain liquid at ordinary temperatures.
Olive oil,groundnut oil,and castor oil are all examples of non-drying oils.
They contain a high content of oleic acid,which prevents them from drying or hardening upon exposure to oxygen.

(D) Semidrying oils are vegetable oils that have an iodine value between $100$ and $130$.
These oils absorb $O_2$ slowly when exposed to air and form a soft,sticky film on the surface.
Cotton seed oil,corn oil,and sesame oil all fall under the category of semidrying oils.
Therefore,the correct answer is $(d)$ All of the above.

(C) Linseed oil is primarily used in the manufacture of paints and varnishes. It is by far the most important drying oil because it contains a high proportion of polyunsaturated fatty acids,such as linolenic acid,which react with oxygen to form a hard,protective film.

(B) In $Cotton$ ($Gossypium$ $herbaceum$), the food reserves, including oil, are stored in the $cotyledons$ of the embryo.
In $Castor$ ($Ricinus$ $communis$), the seed is albuminous (endospermic), meaning the food reserves, including oil, are stored in the $endosperm$.

(C) $Glycine \ max$ (Soybean) is a leguminous plant that is widely cultivated for its seeds.
It is an excellent source of both high-quality plant protein and edible vegetable oil.
Therefore,it is considered an important oilseed crop as well as a pulse crop.

(D) The seeds of $Arachis$ $hypogaea$ (groundnut) are a significant source of nutrition.
They are rich in proteins and contain nicotinic acid (Niacin).
They are also a good source of fats and lecithin.
Furthermore, they contain various vitamins, including $B_1$ (thiamine), $B_2$ (riboflavin), $B_6$ (pyridoxine), and $E$ (tocopherol).
Therefore, all the given options are correct.

(C) $Arachis$ $hypogaea$ is the scientific name for the groundnut or peanut plant.
The oil extracted from the cotyledons of these seeds is known as groundnut oil or peanut oil.
Groundnut oil is classified as a non-essential oil because it does not evaporate easily and is not volatile.
Furthermore,it is classified as a non-drying oil because it does not form a hard,dry film when exposed to air,unlike drying oils such as linseed oil.
Therefore,it is a non-essential non-drying oil.

(A) $Madhuca \ indica$ (commonly known as $Mahua$) belongs to the family $Sapotaceae$.
This plant is economically important as its seeds are used to extract oil,which is widely utilized in the soap and detergent industry.

(A) Rice bran is the outer layer of the rice grain removed during the milling process.
It is a rich source of $15-20\%$ edible oil,known as rice bran oil,which is extracted from the bran layer.
Therefore,rice bran is primarily used to obtain oil.

(C) $Ricinus \text{ } communis$ (Castor) is a perennial shrub or small tree that is widely cultivated in South India for its oil-rich seeds.
$Arachis \text{ } hypogaea$ (Groundnut) is a herbaceous plant, not a tree.
$Brassica \text{ } campestris$ (Mustard) is an annual herb.
$Gossypium \text{ } herbaceum$ (Cotton) is primarily grown for fiber, not as an oil-yielding tree crop.

(A) An oil seed crop is a plant grown primarily for the oil contained in its seeds.
Among the given options, $Sunflower$ ($Helianthus$ $annuus$) is a major oil seed crop, as its seeds are rich in vegetable oil.
Rose, Marigold, and Chrysanthemum are primarily grown as ornamental flowers.

(D) Essential oils are volatile substances that evaporate upon contact with air and possess a pleasant fragrance. Examples include rose, sandalwood, clove, and eucalyptus oils.
Groundnut oil is a fixed oil (fatty oil) extracted from the seeds of $Arachis$ $hypogaea$. It does not evaporate like essential oils and is used primarily for cooking and industrial purposes. Therefore, the correct answer is $D$.

(D) Sunflower $(Helianthus \ annuus)$ is an important oilseed crop.
Its seeds are rich in edible vegetable oil,which is extracted and used for cooking and industrial purposes.
Therefore,it is primarily cultivated for the production of oil.

(C) The family $Cruciferae$ (also known as $Brassicaceae$) is well-known for containing many important oil-yielding plants.
Examples include $Brassica$ $juncea$ (mustard),$Brassica$ $campestris$ (rapeseed),and $Eruca$ $sativa$ (taramira),which are primary sources of edible vegetable oils.
While other families may contain some oil-yielding species,the $Cruciferae$ family is characterized by a high concentration of such economically significant plants.

(D) The correct answer is $(d)$. Til or Gingelly oil is obtained from the seeds of $Sesamum\, indicum$ (family $Pedaliaceae$).
These seeds contain approximately $50\%$ oil.
This oil is widely used for cooking purposes and in the manufacturing of soaps.

(D) $Ricinus\,\,communis$,commonly known as castor,is the plant from which castor oil is extracted from the seeds.
It belongs to the family $Euphorbiaceae$.
Castor oil is widely used as a cathartic (laxative),a lubricant in machinery,and historically for illumination.

(A) $Carthamus$ $tinctorius$, commonly known as safflower, is a highly valued oil-yielding plant.
Its seeds are rich in high-quality vegetable oil, which is widely used in cooking and industrial applications.
In contrast, $Cicer$ $arietinum$ (chickpea) and $Lens$ $esculenta$ (lentil) are pulses, while $Eleusine$ $coracana$ (finger millet) is a cereal crop.

(B) Lemon grass oil is primarily extracted from the leaves and stalks of the plant $Cymbopogon$ $citratus$.
It is widely used in aromatherapy,cosmetics,and as a natural insect repellent due to its high citral content.

(D) The peanut or groundnut,scientifically known as $Arachis\, hypogaea$,is a legume crop belonging to the family $Fabaceae$ (formerly $Papilionaceae$).
It is widely cultivated for its edible seeds,which are a rich source of vegetable oil used for cooking and the production of margarine.

(C) Peanut oil is extracted from the seeds of the peanut plant, which is scientifically known as $Arachis \text{ } hypogaea$.
$Lathyrus \text{ } odoratus$ is the sweet pea.
$Pisum \text{ } sativum$ is the garden pea.
$Glycine \text{ } max$ is the soybean.
Therefore, the correct option is $C$.

(C) Clove $(Syzygium\, aromaticum)$ belongs to the family $Myrtaceae$.
Clove oil is extracted from the dried flower buds of the plant.
It is widely used in perfumes,flavoring agents,and medicines due to its antiseptic and analgesic properties.

(C) Palm oil is a vegetable oil derived from the mesocarp (reddish pulp) of the fruit of the oil palms.
The primary species used for commercial palm oil production is $Elaeis \ guineensis$.
$Glycine$ refers to the genus of soybeans,$Gossypium$ refers to cotton,and $Olea$ refers to olives.