Zoology Sem 6 Ncbcs Modal Paper

Milk is the most common of all dairy foods because it is widely consumed and used as an ingredient in various dishes and beverages. It is a staple in many diets and is available in different forms such as whole milk, skim milk, and flavored milk. Milk is also used to produce other dairy products like cheese, butter, and ghee.

The mantle is the correct answer because it is the tissue responsible for secreting the calcium carbonate and protein layers that form the pearl. The mantle covers the soft body of the bivalve mollusk and plays a crucial role in shell formation and repair. When an irritant, such as a piece of sand, enters the mollusk's shell, the mantle cells begin to secrete layers of nacre around it, eventually forming a pearl.

A pearl bed that produces the best quality pearls is known as a Lingha pearl.

Mulberry silk is considered the best silk because it is produced by silkworms that are fed a specific diet of mulberry leaves. This results in silk with a finer texture, higher quality, and greater durability compared to other types of silk. Eri silk is produced by domesticated silkworms and has a coarser texture. Tassar silk is produced by wild silkworms and has a rougher texture. Therefore, Mulberry silk is the preferred choice for its superior quality.

The generic name for a honey bee is Apis. Apis is a genus of bees that includes several species, commonly known as honey bees. These bees are known for their ability to produce and store honey, as well as their important role in pollination. The generic name "Apis" is used to classify and identify these specific types of bees.

Induced breeding is a technique used in pisciculture, which refers to the rearing and breeding of fish. This method involves artificially stimulating the fish to spawn by manipulating their environmental conditions, such as temperature and light. By controlling these factors, fish farmers can encourage breeding and increase the production of fish. Therefore, induced breeding is effective in pisciculture, but not in sericulture (silk production), apiculture (beekeeping), or lac culture (cultivation of lac insects).

Nactor is not a bee product. Bee venom, honey, and wax are all derived from bees and are commonly known bee products. However, Nactor is not a recognized bee product and is not associated with bees in any way.

Honey is considered acidic due to its low pH level, which typically ranges between 3.2 and 4.5. This acidity is primarily caused by the presence of organic acids such as gluconic acid and citric acid. These acids contribute to the characteristic tangy taste of honey. Additionally, the acidic nature of honey helps to inhibit the growth of bacteria and other microorganisms, making it a natural preservative.

The correct answer is "Tadpole larva". Tadpole larvae are the larval stage of amphibians, particularly frogs and toads, and not prawns. Prawns have different types of larvae, such as Paneus larva, Nauplius larva, and Zoea larva.

The sting apparatus in honey bees is a modified form of the ovipositor. The ovipositor is a tube-like structure found in female insects used for laying eggs. In honey bees, the ovipositor has been adapted for defense purposes, allowing the bee to inject venom into its enemies. This modified ovipositor, or sting, is barbed, which means it can get stuck in the target, causing the bee to lose its sting and ultimately die.

A group of dairy cattle is called a herd. This term is commonly used to refer to a large group of animals, especially cattle, that are kept together and managed as a unit. In the context of dairy farming, a herd typically consists of multiple cows that are raised and milked together. The term "herd" accurately describes the social structure and management practices commonly associated with dairy cattle.

Commercial silk is obtained from the cocoon/pupa stage of the silk moth's life cycle. Silk is produced by the silk moth larvae, also known as caterpillars, as they spin a protective cocoon around themselves. The cocoon is made up of a single thread of silk that can be unraveled and used to produce silk fabric. Once the cocoon is formed, the larvae undergo metamorphosis and transform into adult moths. However, if the larvae are allowed to complete their life cycle and emerge as adult moths, they will break the silk thread, making it unsuitable for commercial use. Therefore, the silk industry harvests the cocoon/pupa stage to obtain the highest quality silk fibers.

China has the highest annual production of fresh water prawns compared to India, the U.S., and Vietnam. This can be attributed to several factors such as favorable climate conditions, availability of suitable water bodies for prawn cultivation, advanced aquaculture techniques, and a large domestic market demand. China's extensive coastline and inland water resources provide ample opportunities for prawn farming, leading to higher production levels. Additionally, China's well-established aquaculture industry and government support contribute to its dominance in fresh water prawn production.

Nacre is the correct answer because it refers to the mother of pearl layer found in the shells of certain mollusks. It is composed of calcium carbonate and conchiolin, giving it a iridescent and lustrous appearance. Nacre is responsible for the formation of pearls and is highly valued for its beauty and durability. The other options mentioned in the question, such as prismatic layer, periostracum, and mentle, are not synonymous with the mother of pearl layer.

The life cycle of a mulberry silk worm is completed in 45 days. This includes the various stages of development from egg to larva (caterpillar), pupa, and finally to adult moth. During this time, the silk worm undergoes molting and growth, spinning a cocoon made of silk fibers. After around 45 days, the adult moth emerges from the cocoon and the life cycle starts again.

Aseel is not a breed of dairy cattle. Aseel is actually a breed of gamefowl, which is a type of chicken bred for cockfighting. Unlike the other options listed, Aseel is not known for its milk production or use in the dairy industry. The other options, Red Sindhi, Sahiwal, and Red Dane, are all recognized breeds of dairy cattle known for their milk production.

Silk fibres are held together in a cocoon by a substance known as sericin. Sericin is a natural protein that is secreted by the silk worm to form a protective coating around the silk fibres. It acts as a glue-like substance, binding the individual silk fibres together and providing strength and structure to the cocoon. Sericin also helps to protect the silk fibres from external factors such as moisture and bacteria. Once the cocoon is harvested for silk production, the sericin is usually removed through a process called degumming to make the silk fibers soft and lustrous.

Pearl oysters secrete pearls as a defense mechanism to protect themselves against invading parasites. When a parasite or foreign object enters the oyster's mantle cavity, it irritates the oyster. In response, the oyster secretes layers of nacre, a combination of calcium carbonate and organic substances, around the irritant to form a pearl. This process helps to isolate and encapsulate the parasite, preventing further damage to the oyster's tissues. Therefore, the secretion of pearls serves as a protective response against invading parasites.

Among honey bees, the workers are female. In a honey bee colony, there are three types of bees: the queen, the drones, and the workers. The queen is the only fertile female in the colony and her main role is to lay eggs. The drones are male bees whose sole purpose is to mate with the queen. The workers, on the other hand, are also female bees but they are infertile. They perform various tasks such as gathering nectar, building and maintaining the hive, caring for the young, and defending the colony.

The ideal temperature for hatching eggs is between 99-102 degrees Fahrenheit. This temperature range provides the optimal conditions for the embryos inside the eggs to develop and hatch successfully. Temperatures below this range may result in slower development or even death of the embryos, while temperatures above this range can lead to abnormal development or premature hatching. Therefore, maintaining a temperature within the 99-102 degree Fahrenheit range is crucial for successful egg hatching.

Pearl of commercial value are produced by the genus Pictada. Pictada is known for producing high-quality pearls that are used in the jewelry industry. Pearls are formed when an irritant, such as a grain of sand, enters the shell of the Pictada mollusk. The mollusk then secretes layers of nacre around the irritant, forming a pearl. Pictada pearls are highly valued for their luster, size, and shape, making them a sought-after gemstone in the market.

Lac is used in the varnish industry for producing a glossy finish on various surfaces. It is also used in the printing industry as a binder for ink. Additionally, lac is used in the production of gramophone records, where it acts as a protective coating. Lastly, lac is used in the electricity industry for insulating wires and cables. Therefore, the correct answer is that lac is used in gramophone records, varnish industry goods, printing industry, and electricity industry.

India is the correct answer because it is the only country out of the given options that produces all four varieties of silk mentioned in the question. Mulberry, muga, oak, and tussar silk are all produced in different regions of India. China is known for mulberry silk, Japan for tussar silk, and Korea for oak silk, but none of these countries produce all four varieties. Therefore, India is the only country that fits the description.

Prawns typically breed multiple times in a season. The correct answer, 3-4 times, suggests that prawns have the ability to reproduce three to four times within a specific breeding season. This implies that prawns have a relatively high reproductive capacity, allowing them to produce multiple batches of offspring during their breeding period.

Lac is a natural resin secreted by insects and is commonly used in the production of varnishes and polishes. It is composed of a combination of resin, pigment, wax, and glue. The resin provides the main structure and adhesive properties, while the pigment adds color. The wax helps to give lac a smooth and glossy finish, and the glue acts as a binder to hold the components together. Therefore, the correct answer is "Resin pigment wax and glue".

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The beekeeper feeds the bees with sugar because sugar is a common food source for bees. Bees need carbohydrates for energy, and sugar provides a readily available source of carbohydrates. It is often mixed with water to create a sugar syrup that can be easily consumed by the bees. Milk, fruit, and herb are not typically used as food sources for bees.

India is the largest lac producing country. Lac is a resinous substance that is obtained from the secretions of certain insects, and it is used in various industries such as cosmetics, pharmaceuticals, and food processing. India has a favorable climate and suitable conditions for the growth of the lac insect, which makes it the largest producer of lac in the world. Additionally, India has a long history of lac cultivation and has developed expertise in lac production, further contributing to its dominant position in the industry.

Apis dorsata is commonly known as the rock bee. It is a species of bee that is native to Asia, including India. The name "rock bee" refers to its nesting behavior, as it often builds its nests on high cliffs or rock formations. This species is known for its large size and aggressive behavior, making it distinct from other types of bees such as the little bee or European bee. Therefore, the correct answer for the given question is rock bee.

Bombyx mori is the correct answer because it is a species of silk moth that is widely known for producing high-quality silk. The silk produced by Bombyx mori is considered superior due to its softness, strength, and luster. This species has been selectively bred for thousands of years to enhance silk production, making it the most commonly used silk moth in the textile industry. Attacus ricini, Antrea sps, and Attacis atalus are not known for producing silk of superior quality.

Honey bees communicate the location of food through a dance known as the round and waggle dance. This dance involves the bee moving in a circular pattern, followed by a series of figure-eight movements known as the waggle phase. During the waggle phase, the bee also vibrates its abdomen to indicate the direction and distance of the food source. This dance is an important form of communication within the bee colony, allowing other bees to locate and gather food efficiently.

Isinglass is a substance that is prepared from fishes. It is a form of collagen that is obtained from the swim bladders of certain species of fish. Isinglass is commonly used in the production of gelatin and as a fining agent in the clarification of wine and beer. It is transparent and has adhesive properties, making it useful in various industries.

The correct answer is "Rohu catla clarius mystis" because these three types of fish are freshwater fish that are known for their high food value. They are commonly consumed and valued for their taste and nutritional benefits.

Kusum lac is the correct answer because the question states that Palas and ber produce a particular type of lac. Lac is a resinous substance that is secreted by insects and is used in various applications. Kusum lac is a type of lac that is produced by the insects living on the Kusum tree. Therefore, Kusum lac is the correct answer as it is the specific type of lac produced by Palas and ber trees.

Macrobranchium rosenbergii is commonly known as the Malaysian prawn. This species of prawn is native to Southeast Asia, particularly Malaysia. It is a popular freshwater prawn species that is widely cultivated for its meat. The name "Malaysian prawn" accurately describes the origin and identity of this particular species of prawn.

The correct answer is "Juice of plant from phloem". The larvae of the lac insect feed on the juice of the plant from the phloem. Phloem is a vascular tissue in plants that transports sugars and other nutrients from the leaves to other parts of the plant. The lac insect larvae pierce the phloem and extract the sap, which they use to build their protective covering called lac. This answer is supported by the information provided in the question.

The correct answer is "Parasitic" because lac insects are known to be parasites. They infest certain trees and feed on their sap, causing damage to the host plant. They form a symbiotic relationship with a specific type of bacteria that helps them digest the sap. However, they are considered parasites because they harm their host and benefit at its expense.

Wilmer Steel is considered the mother of broiler poultry farming. This implies that she is recognized as the pioneer or leading figure in the development and advancement of this specific type of farming.

Pearl culture refers to the process of producing pearls artificially. It involves the insertion of a foreign object, such as a bead or tissue, into a mollusk to stimulate the formation of a pearl. This method allows for the controlled production of pearls, which can be harvested after a certain period of time. Pearl production and pearl manufacture are incorrect terms as they do not specifically refer to the artificial process of pearl cultivation.

Pelecypods, also known as bivalves, are primarily used for pearl culture. Bivalves such as oysters and mussels are commonly used in the production of pearls. These mollusks have the ability to form pearls by secreting nacre, a substance that coats foreign objects within their shells. Cultured pearls are created by inserting a small object, such as a piece of shell or a bead, into the bivalve's mantle. Over time, layers of nacre build up around the object, creating a pearl. Therefore, pelecypods are the correct answer for the molluscan group primarily used for pearl culture.

Catla is considered an important food fish because it is widely consumed and highly valued for its taste and nutritional value. It is a freshwater fish species found in rivers and lakes in India and other parts of Southeast Asia. Catla is known for its large size, fast growth rate, and high protein content. It is also rich in essential fatty acids, vitamins, and minerals, making it a healthy choice for consumption. Due to its popularity and commercial importance, Catla is extensively cultivated and harvested for the food industry.

Cod liver oil is extracted from cartilaginous fishes because they have a higher concentration of oil in their livers compared to bony fishes. Cartilaginous fishes, such as sharks and rays, have a large liver that is rich in oil, which is why they are a preferred source for extracting cod liver oil. Bony fishes, on the other hand, have a smaller liver and lower oil content, making them less suitable for oil extraction. Buffaloes and whales are not known for having oil-rich livers, making them incorrect options for the extraction of cod liver oil.

Silk contains a protein known as fibroin, which is responsible for its strength and elasticity. Additionally, silk also contains sericin, another protein that acts as a protective coating around the fibroin fibers. Therefore, the correct answer is 1 and 3 both, as both fibroin and sericin are present in silk.

Chicken manure can be used in both biodiesel production and as a fertilizer. Biodiesel is a renewable energy source made from organic materials, including animal fats and vegetable oils. Chicken manure contains high levels of fats, making it a suitable feedstock for biodiesel production. Additionally, chicken manure is rich in nutrients like nitrogen, phosphorus, and potassium, which are essential for plant growth. Therefore, it can be used as a natural fertilizer to improve soil fertility and promote healthy plant growth. Hence, the correct answer is Both 1&2.

Sericulture, the practice of silk production, is native to China. China has a long history of silk production, dating back thousands of years. The country is known for its expertise in sericulture and has been a major producer of silk for centuries. India, Japan, and Korea also have a history of sericulture, but it originated in China.

Bombyx mori, also known as the silkworm, is a species of moth that lays a significant number of eggs. The given answer range of 300-500 suggests that the number of eggs laid by Bombyx mori can vary within this range. This indicates that the species typically lays a moderate amount of eggs, neither too low nor too high.

Myosin is a protein found in muscle tissue and is not typically found in fish food. Fish food is usually made up of ingredients such as fish meal, plant proteins, and other nutrients specific to the dietary needs of fish. Myosin is more commonly found in meat products and is not a typical component of fish food. Therefore, it can be concluded that myosin possesses the lowest level among the given options.

The correct answer is "Both 2 & 3". This means that both statement 2, which states that the larval form of moth secretes silk, and statement 3, which states that silk is extracted from the cocoon of the moth by boiling, are correct. The larval form of the moth, known as the caterpillar, produces silk through specialized glands in its mouth. This silk is then used to construct a cocoon, which is made of a single thread of silk that the caterpillar spins around itself. To extract the silk from the cocoon, it is typically boiled to soften the silk fibers, making it easier to unravel.

Pisciculture is the culture of aquatic animals, including prawns and fishes. This means that it involves the breeding, rearing, and harvesting of these animals in controlled environments such as ponds or tanks. Prawns are a type of crustacean that are commonly cultivated for their meat, while fishes encompass a wide range of species that are raised for various purposes including food, sport, or ornamental display. Therefore, both prawns and fishes are correct examples of aquatic animals that can be cultured through pisciculture.

Honey mainly consists of disaccharides. Disaccharides are a type of sugar composed of two monosaccharides joined together. Honey is primarily made up of two types of disaccharides: sucrose and maltose. Sucrose is formed by the combination of glucose and fructose, while maltose is formed by the combination of two glucose molecules. These disaccharides give honey its sweet taste and provide energy when consumed.