Every Day Science

The correct answer is Collagen because it is the primary structural protein found in animal skins, which serves as the foundational material for leather.

• Step 1 (Source Material): Leather is produced by processing animal hides and skins. The dermis layer of these skins comprises about 85% of its total structure and is largely made up of the fibrous protein called collagen.


• Step 2 (Tanning Process): During the tanning process, the raw collagen fibers are cross-linked and chemically stabilized to prevent decay and create a durable material.


• Incorrect Options:
  
  
  
  • Carbohydrates is incorrect because carbohydrates are organic compounds like sugars and starches, which are not a structural component of animal skin or leather.
  
  
  • Syntans is incorrect because synthetic tannins (syntans) are chemicals or agents used during the retanning process, not a primary raw ingredient of the hide itself.
  
  
  • None of these is incorrect because the second option is the exact mathematical and scientific fact.
  
  

The correct answer is Leg because the fibula is one of the two long bones that form the skeletal structure of the human lower leg.

• Leg: This is the correct choice. The fibula (also known as the calf bone) runs parallel to the tibia (shinbone) between the knee and the ankle. It is significantly thinner than the tibia and functions primarily as an attachment site for muscles and as a structural stabilizer for the ankle joint.


• Incorrect Options:
  
  
  
  • Arm: This is incorrect. The long bones found in the human arm are the humerus (upper arm), radius, and ulna (forearm).
  
  
  • Skull: This is incorrect. The human skull consists of cranial and facial bones such as the frontal, parietal, occipital, temporal, zygomatic, and mandible bones.
  
  

The correct answer is Insulin because Sir Frederick Banting revolutionized modern medicine by successfully isolating this hormone to manage diabetes.

• Insulin: This is the correct choice. In 1921, Canadian scientist Sir Frederick Banting, alongside Charles Best, isolated insulin from pancreatic tissues at the University of Toronto. This breakthrough turned a previously fatal metabolic condition (Type 1 Diabetes) into a manageable chronic condition, earning Banting the Nobel Prize in Physiology or Medicine.


• Incorrect Options:
  
  
  
  • Covid Vaccine / Anti-Rabies Vaccine: These are incorrect. Insulin is a pancreatic hormone treatment rather than an immunological vaccine. Louis Pasteur famously developed the anti-rabies vaccine, while COVID-19 vaccines were developed by modern global consortiums nearly a century later.
  
  

The correct answer is A Grass family because bamboo is botanically classified as a giant perennial evergreen plant within the grass kingdom.

• A Grass family: This is the correct choice. Bamboos belong to the true grass family known scientifically as Poaceae. They are notable for being the largest and fastest-growing members of the grass family, utilizing unique cellular elongation properties.


• Incorrect Options:
  
  
  
  • A weed family: This is incorrect. 'Weed' is a generic ecological descriptor for any unwanted plant growing out of place rather than an official botanical taxonomy.
  
  
  • A Herb family: This is incorrect. While young shoots are soft, bamboo develops woody culms and belongs structurally to the grasses.
  
  

The correct answer is Maize because it serves as the primary commercial source raw material for industrial glucose extraction through starch hydrolysis.

• Maize: This is the correct choice. In commercial production, starch is extracted from corn (maize) kernels and treated with acids or food-grade enzymes to break down the complex polysaccharides into simple sugars, resulting in what is globally known as corn syrup or liquid glucose.


• Incorrect Options:
  
  
  
  • Sugar Cane / Beetroot: These are incorrect. While these agricultural plants are the world's primary sources of sucrose (standard table sugar), they are not the typical baseline materials processed to manufacture industrial glucose syrup.
  
  

The correct answer is Oxygen because it comprises nearly half of the entire chemical mass composition of the Earth's crustal layer.

• Oxygen: This is the correct choice. Oxygen makes up approximately 46.6% of the Earth's crust by weight. It is not found as a free gas here, but rather chemically bound within silicate minerals, oxides, and water.


• Incorrect Options:
  
  
  
  • Carbon dioxide / Ozone: These are incorrect. These choices represent atmospheric gases rather than elements that constitute the solid, physical crust layer of the Earth. Silicon is the second most abundant crustal element, not carbon or ozone variants.
  
  

The correct answer is Retina because it functions as the sensory inner lining containing specialized neural cells that convert light into visual signals.

• Retina: This is the correct choice. The retina lines the back interior of the eyeball and is packed with millions of photoreceptor cells called rods (which process low-light/night vision) and cones (which process sharp color vision). These cells capture incoming light photons and convert them into electrical impulses transmitted to the brain via the optic nerve.


• Incorrect Options:
  
  
  
  • Cornea: This is incorrect. While the cornea is the most physically/tactilely sensitive tissue regarding pain reception due to dense pain-sensing nerve endings, it is a clear structural window that focuses light rather than a tissue that senses light brightness or color.
  
  
  • Pupil: This is incorrect. The pupil is simply an adjustable central aperture or opening that controls the total volume of light permitted to enter the inner chamber.
  
  
  • Lens: This is incorrect. The lens is a transparent, flexible biconvex structure responsible for refracting and sharpening focus onto the rear wall.
  
  

The correct answer is Odontology because this branch of science deals explicitly with the structural layout, development, and pathology of human teeth.

• Odontology: This is the correct choice. Derived from Greek roots, it encompasses the scientific evaluation of dental anatomy, tooth development, and specialized forensic dentistry used to identify individuals via dental characteristics.


• Incorrect Options:
  
  
  
  • Ornithology: This is incorrect. It is the branch of zoology that focuses entirely on the scientific study of birds.
  
  
  • Orthoepy: This is incorrect. This is a linguistic sub-discipline dealing with the correct pronunciation of words.
  
  
  • Pedagogy: This is incorrect. This refers to the method, practice, and academic theory of teaching and education.