Biology

Intermediate neurons, also known as interneurons, are located in the brain and spinal cord where they connect sensory and motor neurons to process information.

The skin is the largest organ of the human body by surface area and weight, serving as a protective barrier. Other organs like the liver and heart are internal and smaller in size compared to the skin.

Both snails, octopuses, and spiders have blue blood due to the presence of hemocyanin, a copper-containing molecule that turns blue when oxygenated. Therefore, all the listed animals have blue blood.

The lungs remove carbon dioxide from the blood during exhalation, which is a waste product of cellular respiration. This process helps maintain the body's acid-base balance and allows oxygen to be absorbed into the blood.

The octopus is known for having three hearts: two branchial hearts that pump blood to the gills, and one systemic heart that pumps blood to the rest of the body. None of the other animals listed have three hearts.

According to the heterotrophic hypothesis, the earliest organisms on Earth were simple heterotrophs that obtained food from organic substances present in their environment. Autotrophs evolved later with the ability to produce their own food.

Locked-in syndrome (LiS) is a neurological disorder characterized by complete paralysis of voluntary muscles except for those that control eye movement, typically caused by brainstem damage.

Vitamin A deficiency primarily causes night blindness because it is essential for the formation of rhodopsin, a pigment in the retina that helps vision in low light. Other options like rickets, scurvy, and hair fall are caused by deficiencies of vitamin D, vitamin C, and other factors respectively.

‘Alba’ is a genetically modified glowing rabbit created by artist Eduardo Kac as a pioneering example of bio art, making option C correct.

The fluid part of blood is called plasma, which is a yellowish liquid that carries blood cells, nutrients, hormones, and waste products throughout the body. Platelets and blood cells are components suspended in the plasma, not the fluid itself.

Alzheimer's disease is primarily a brain disorder characterized by progressive neurodegeneration affecting memory and cognitive functions. It is not classified as a genetic disorder in the strict sense, although genetics can influence risk.

Darwinism is based on natural selection, overproduction, and competition for survival. Inheritance of acquired characters is a Lamarckian concept, not part of Darwin's theory.

Lycopene is the pigment responsible for the red color inside a watermelon. It is a red carotenoid pigment found in various red fruits and vegetables, including tomatoes and watermelons.

The average lifespan of red blood cells in the human body is approximately 120 days before they are broken down and recycled by the spleen and liver.

White blood cells (WBCs) generally have a lifespan ranging from 1 to 5 days, depending on the type. Some WBCs may live longer, but the typical range is 1-5 days, making option A the most accurate.

The average adult human has a blood volume of about 5 to 6 liters, with 6 liters being a commonly accepted average for a typical adult. Therefore, option C (6 liters) is the most accurate choice.

Eugenics is the study and practice of improving the genetic quality of the human population by selective breeding or genetic intervention, which aligns with option A.

Hummingbirds are warm-blooded animals that regulate their own body temperature internally, which classifies them as endotherms. This means they generate heat metabolically rather than relying on external sources.

At night, photosynthesis stops because there is no sunlight, so plants do not produce oxygen. However, they continue to respire, taking in oxygen and giving off carbon dioxide, just like animals.

Addison's disease, also known as primary adrenal insufficiency, is caused by the failure of the adrenal glands to produce sufficient hormones, primarily cortisol and aldosterone. This failure is most commonly due to autoimmune destruction of the adrenal cortex. The pituitary gland produces adrenocorticotrophic hormone (ACTH), which stimulates the adrenal glands to produce these hormones. In Addison's disease, the adrenal glands fail despite normal or elevated ACTH levels. Therefore, the disease is caused by adrenal hormone deficiency, not ACTH deficiency. However, among the given options, ACTH (option D) is the hormone most closely related to adrenal function regulation. The other options (Antidiuretic Hormone, Luteinising Hormone, Melanophore Stimulating Hormone) are unrelated to Addison's disease. Hence, option D is the best choice given the options, but it should be understood that Addison's disease results from adrenal gland hormone deficiency, not ACTH deficiency.

Individuals with the AB+ blood group are considered universal recipients because they have all A, B, and Rh antigens, allowing them to receive red blood cells from any blood type without immune reaction.

In photosynthesis, oxygen is released as a byproduct when water molecules are split during the light-dependent reactions. Therefore, water is the source of the oxygen produced.

Lyme disease is caused by the bacterium Borrelia burgdorferi, which is transmitted to humans through the bite of infected black-legged ticks. The other bacteria listed do not cause Lyme disease.

Pyridoxine (Vitamin B6) deficiency leads to decreased hemoglobin production because it is essential for heme synthesis, a component of hemoglobin. Deficiency can cause microcytic anemia due to impaired hemoglobin formation.

The study of life beyond Earth, including the possibility of extraterrestrial life, is called Exobiology. The other options refer to different biological fields unrelated to life in outer space.