Domestication and Improvement of Animals and Economic Zoology Questions in English

(D) African elephants ($Loxodonta$ $africana$) differ from Indian elephants ($Elephas$ $maximus$) in several morphological features.
$1$. African elephants have significantly larger,fan-shaped ears compared to the smaller ears of Indian elephants.
$2$. The forehead of an African elephant is convex and sloping,whereas Indian elephants have a high,domed forehead with two distinct prominences on the top of the skull.
$3$. In African elephants,both males and females possess tusks,while in Indian elephants,generally only the males possess prominent tusks.
Therefore,all the given characteristics are correct for African elephants.

(D) Elephants are primarily hunted or sought after for their tusks,which are made of ivory.
Ivory is a valuable material used in making ornaments,carvings,and various decorative items.
Due to the high demand for ivory in the illegal wildlife trade,elephant populations have faced significant threats,leading to their classification as an endangered species in many regions.

(C) The yak $(Bos \text{ } grunniens)$ is a long-haired bovid found throughout the Himalayan region of the Indian subcontinent, the Tibetan Plateau, and as far north as Mongolia and Russia.
It is biologically and physically adapted to high-altitude, cold, and rugged mountain terrain.
It serves as a primary beast of burden, a source of milk, fiber, and meat for the pastoral communities living in these high-altitude regions.
Therefore, it is most useful and specifically adapted to mountain terrain.

(C) The yak is a vital animal in high-altitude regions like the Himalayas. It is used as a beast of burden to transport both people and goods across difficult,mountainous terrain where other forms of transport are not feasible. Therefore,the correct answer is $(c)$.

(D) The Yak $(Bos \, grunniens)$ is a large domesticated wild ox found throughout the Himalayan region. It is primarily found in Tibet, Ladakh, Lahaul and Spiti, Garhwal, and Sikkim. Therefore, all the given options are correct.

(D) The $Yak$ $(Bos \text{ } grunniens)$ is a domesticated bovid found in the Himalayan region.
It is a multipurpose animal that provides various resources to humans.
$1$. Meat: The meat of the $Yak$ is a significant source of protein for high-altitude populations.
$2$. Hide: The skin or hide of the $Yak$ is used for making leather products, tents, and clothing.
$3$. Wool: $Yak$ fiber or wool is highly valued for its warmth and is used to make blankets, ropes, and garments.
Therefore, all the given options are correct.

(C) The $Taraporewala$ $Aquarium$ located in $Mumbai$ is the oldest and one of the most famous public aquariums in $India$. It is a significant center for marine life study and public display, often cited as a prominent aquarium in the country.

(B) Honeybees communicate the location of food sources through specific dances.
When the food source is nearby (less than $75 \ m$),they perform a 'Round dance'.
When the food source is at a distance greater than $75 \ m$,they perform a 'Waggle dance'.
In the 'Waggle dance',the angle of the dance relative to the vertical position of the hive indicates the angle of the food source relative to the sun.
If the food source is in the opposite direction of the sun,the bee performs the waggle run directly downwards (away from the sun's position).

(C) sex pheromone is a chemical signal released by an organism to attract a mate of the opposite sex.
$1$. Bombykol is a well-known sex pheromone produced by the female silkworm moth ($Bombyx$ $mori$).
$2$. Muscone is a sex pheromone found in the musk deer.
$3$. Civetone is a sex pheromone found in the civet cat.
$4$. Formic acid is a defensive secretion produced by ants,primarily used for protection or communication,but it is not classified as a sex pheromone.
Therefore,the correct answer is $C$.

(C) Pigeons produce a substance known as 'crop milk' to feed their young ones. This substance is produced by the sloughing off of fluid-filled cells from the lining of the crop. Both male and female pigeons possess this specialized structure called the crop,which is an expansion of the esophagus used for food storage and the production of crop milk.

(C) The dog $(Canis \text{ } lupus \text{ } familiaris)$ is widely considered to be the first animal domesticated by humans. Archaeological evidence suggests that this domestication occurred during the Paleolithic era, likely as a result of a symbiotic relationship where wolves scavenged near human camps, eventually leading to a mutualistic bond.

(B) The $Dog$ ($Canis$ $lupus$ $familiaris$) is widely considered the earliest animal to be domesticated by humans.
Archaeological evidence suggests that domestication occurred during the $Paleolithic$ era, likely between $15,000$ and $30,000$ years ago, as a companion for hunting and protection.

(A) The Arabian camel $(Camelus dromedarius)$ is the primary species of camel found in India.
The hump of a camel stores fat,which serves as an energy source during periods of food or water scarcity.
The size of the hump is a reliable indicator of the camel's nutritional status and health,as a well-nourished camel possesses a large and firm hump.
Therefore,both Assertion and Reason are correct,and the Reason is the correct explanation of the Assertion.

(B) The Alsatian,also known as the German Shepherd,is a well-known breed of $Dog$ ($Canis$ $lupus$ $familiaris$). It is a domesticated animal belonging to the family $Canidae$.