Domestication of plants Questions in English

(A) $Brassica \ juncea$ is an oil-yielding plant that belongs to the family $Brassicaceae$.

(B) The centre of origin of wheat ($Triticum$ $aestivum$) is widely recognized as the region of South-west Asia,specifically the Fertile Crescent,which includes parts of modern-day Turkey,Iraq,Iran,and the Levant. This region provided the wild ancestors of wheat,such as $Triticum$ $dicoccoides$,which were domesticated by early human civilizations.

(B) The sunflower $(Helianthus \, annuus)$ is native to North America. Archaeological evidence and botanical studies suggest that the domestication of the sunflower originated in the region of $Mexico$ and $Central \, America$ before spreading to other parts of the world.

(C) Maize $(Zea \ mays)$ is believed to have been domesticated from a wild grass called teosinte $(Zea \ mays \ ssp. \ parviglumis)$.
Archaeological and genetic evidence indicates that this domestication process occurred approximately $7,000$ to $10,000$ years ago in the Balsas River Valley of Mexico.
From Mexico,the cultivation of maize spread throughout Central America and eventually to the rest of the world.

(A) According to the Vavilovian centre of origin theory,South-east Asia is considered the primary centre of origin for several important crops.
Specifically,this region is recognized as the origin for $Rice$ ($Oryza$ $sativa$),$Sugarcane$ ($Saccharum$ $officinarum$),$Mango$ ($Mangifera$ $indica$),and $Banana$ ($Musa$ $spp.$).
Therefore,option $A$ is the most comprehensive and correct answer.

(A) The centre of origin for many temperate fruits, including almond $(Prunus \text{ } dulcis)$ and apple $(Malus \text{ } domestica)$, is identified as the region of Asia Minor and Afghanistan. This region, often referred to as the Near East or Central Asian centre, is known for the high genetic diversity of these species.

(C) The crop that originated in the South American regions of Peru and Brazil is Groundnut $(Arachis \text{ } hypogaea)$. Although it is native to South America, it is now extensively cultivated in India, which is one of the world's largest producers of groundnuts.

(C) According to the Vavilov center of origin theory, $Ethiopia$ is considered the primary center of origin for several important crops.
Barley $(Hordeum \text{ } vulgare)$, coffee $(Coffea \text{ } arabica)$, and sorghum $(Sorghum \text{ } bicolor)$ are all native to the $Ethiopian$ highlands.
Therefore, the correct option is $C$.

(D) Nikolai Ivanovitch Vavilov $(1926)$ proposed different centres of origin for various crop plants based on two criteria:
$(i)$ Occurrence of wild relatives.
$(ii)$ Occurrence of maximum variations in the crop.
There are $11$ such centres identified by him.

(C) The origin of agriculture is estimated to have occurred approximately $7000-13000$ years ago.
This development took place during the Mesolithic period in fertile,well-watered regions such as the Indus,Tigris,Nile,and Euphrates river valleys.

(C) Nikolai Vavilov proposed that the centres of origin for most cultivated crop plants are located in mountainous regions of both tropical and temperate zones. These regions provide diverse microclimates,isolation,and environmental heterogeneity,which facilitate high genetic diversity and the evolution of new plant varieties.

(D) $Acclimatization$ is the process of physiological or morphological adjustment by an organism to a new environment,which allows it to survive and function effectively under changed conditions.

(B) Both tomato $(Solanum \ lycopersicum)$ and potato $(Solanum \ tuberosum)$ are members of the family $Solanaceae$.
These crops originated in the Andean region of South America,specifically in countries like Peru and Bolivia,before being introduced to the rest of the world.

(B) Rice $(Oryza \text{ } sativa)$ is the staple food crop for more than half of the world's population, particularly in Asia. It is the primary source of calories for a vast majority of the Asian population due to the favorable climate and agricultural practices in the region.

(D) New crops are plants that have been introduced or domesticated for commercial use in regions where they were not previously grown. $Jojoba$ ($Simmondsia$ $chinensis$) is grown for its oil. $Leucaena$ is a leguminous tree used for fodder and fuel. $Guayule$ ($Parthenium$ $argentatum$) is a source of natural rubber. Therefore, all these are examples of new crops.

(C) The groundnut $(Arachis \, hypogaea)$ is a legume crop that originated in South America. Specifically, the center of origin for groundnut is identified as Brazil and the surrounding regions in South America. It was later introduced to other parts of the world, including Africa and India, by explorers.

(A) The term 'new crop' refers to crops that have been introduced or domesticated for agricultural use in relatively recent times compared to ancient staples. Among the given options,$Soybean$ $(Glycine \ max)$ is widely recognized in agricultural history as a crop that gained significant global importance and widespread cultivation in more recent centuries compared to ancient crops like lentils or sugar beets. Therefore,it is often categorized as a new crop in various agricultural contexts.

(B) The scientific name of Pearl Millet (Bajra) is $Pennisetum$ $typhoides$ (also known as $Pennisetum$ $glaucum$).
$Triticum$ $aestivum$ is the scientific name for wheat.
$Zea$ $mays$ is the scientific name for maize (corn).
$Sorghum$ $vulgare$ is the scientific name for sorghum (jowar).

(C) The groundnut $(Arachis \, hypogaea)$ is a legume crop that originated in South America. Specifically, the center of origin for groundnut is identified as Brazil. It was later introduced to other parts of the world, including Africa and India, where it is now widely cultivated.

(A) The term 'new crop' refers to crops that have been introduced or domesticated for large-scale cultivation in regions where they were not traditionally grown. Among the given options, $Soybean$ $(Glycine \ max)$ is considered a relatively new crop in many parts of the world, including India, where it has gained significant importance in modern agriculture as a major oilseed and protein source.

(B) The plant $Simmondsia$ $chinensis$,commonly known as Jojoba,produces seeds that contain a liquid wax. This liquid wax is chemically very similar to the oil obtained from the sperm whale. Due to its high quality and lubricating properties,it is used in various industries,including cosmetics and lubricants,as a sustainable alternative to animal-derived sperm whale oil.

(B) Castor oil is a vegetable oil obtained by pressing the seeds of the castor oil plant,$Ricinus$ $communis$.
It is a non-edible oil used for various industrial and medicinal purposes.
$Brassica$ $campestris$ is the mustard plant,$Helianthus$ $annuus$ is the sunflower,and $Arachis$ $hypogaea$ is the groundnut or peanut plant.

(B) The origin of cultivated rice $(Oryza sativa)$ is widely accepted to be in the tropical and subtropical regions of Asia, specifically in the area encompassing India and Southeast Asia. While $Pennisetum$ (pearl millet) and $Sorghum$ (jowar) are known to have originated in Africa, rice is historically and botanically traced back to the Indian subcontinent.

(B) The process by which a plant variety,line,or population adapts to a new environment is known as $Acclimatization$. This physiological adjustment allows the organism to survive and thrive in conditions that differ from its original habitat.

(C) secondary centre of origin or domestication is a region where a crop species has developed significant genetic diversity after its introduction from its primary centre of origin.
India is recognized as a secondary centre for the domestication of the potato $(Solanum \text{ } tuberosum)$.
While the primary centre of origin for the potato is the Andes region of South America, it was introduced to India and subsequently underwent extensive cultivation and diversification.