General Science

Silicon carbide is an extremely hard material, often used as an abrasive in cutting tools, grinding wheels, and sandpaper.

Carbon dioxide is a greenhouse gas that absorbs infrared radiation emitted from the Earth's surface, trapping heat in the atmosphere.

Gregor Mendel, the father of genetics, famously used Pisum sativum, or garden peas, for his foundational experiments on inheritance.

Pinus (pine trees) is characterized by having two types of branches: long shoots and dwarf shoots (also called spur shoots) that bear the needles.

Halophytes are plants that are adapted to grow in environments with high salinity, such as salt marshes or coastal areas.

The cerebrum is the largest part of the human brain, accounting for about 85 percent of the brain's weight. It is responsible for higher brain functions like thought and action.

Wilhelm Conrad Roentgen discovered X-rays in 1895. He was awarded the first Nobel Prize in Physics for this discovery.

Cellular respiration is the metabolic process in which cells break down glucose and oxygen to produce energy, releasing carbon dioxide as a byproduct. Photosynthesis, by contrast, consumes carbon dioxide.

Proteins are complex molecules composed of long chains of amino acids. During digestion, enzymes break these chains down into individual amino acids for absorption.

Ammonia (R-717) is a common refrigerant used in industrial and large-scale cooling systems. While modern domestic refrigerators often use HFCs or hydrocarbons, ammonia is historically and technically significant as a refrigerant.

The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, most commonly sound pressure level.

Silicon is a semiconductor, which makes it the ideal material for manufacturing integrated circuits and computer chips. Its electrical properties can be easily modified to create transistors.

Addison's disease is an endocrine disorder where the adrenal glands don't produce enough hormones (cortisol and aldosterone). 'Intugementary' is a typo for integumentary (skin), but the correct system is endocrine.

The pituitary gland is often called the master gland because it secretes hormones that regulate other endocrine glands, including those that control the development and function of sex organs.

Iron is essential for hemoglobin production, while calcium and phosphorus are the primary minerals required for the structural integrity and formation of bones.

Ribosomes are the cellular machinery responsible for protein synthesis. They translate messenger RNA (mRNA) into polypeptide chains.

Both wine-making and curd formation involve fermentation by microorganisms. Grapes ferment with yeast to produce wine, similar to how bacteria ferment milk to produce curd (yogurt/dahi). Both are microbial conversion processes.

Vitamin A is essential for the formation of rhodopsin, a pigment in the retina that allows for vision in low light. A deficiency leads to night blindness.

Vitamin D is synthesized in the skin when it is exposed to ultraviolet B (UVB) radiation from sunlight. The liver and kidneys then process it into its active form.

A hermaphrodite is an organism that has both male and female reproductive organs. Earthworms are classic examples of simultaneous hermaphrodites.

High levels of cholesterol, particularly LDL cholesterol, can lead to the buildup of plaque in the arteries (atherosclerosis), which significantly increases the risk of heart disease.

Tungsten has the highest melting point of all pure metals, which is approximately 3422 degrees Celsius. Among the choices, 3000 is the closest approximation.

Sound travels fastest in solids because the particles are more closely packed together, allowing for more efficient transmission of mechanical vibrations. Steel is a dense solid.