Biology

Ecology is the branch of biology that studies organisms and their interactions with each other and their environment. Acoustics relates to sound, Ichthyology is the study of fish, and 'None of these' is incorrect.

Human bone contains calcium, boron, and phosphate as part of its mineral and organic matrix. However, chondroitin sulfate is primarily found in cartilage, not bone, making it the correct answer for what human bone does not contain.

Fish respire through their gills, which extract oxygen from water. They do not use lungs or fins for respiration, and the nose is not involved in breathing.

Insulin is the hormone that regulates the metabolism of sugar by facilitating the uptake of glucose into cells and maintaining blood sugar levels. Thyroid hormones influence metabolism broadly but do not specifically regulate sugar metabolism. Glucose is the sugar itself, not a regulator.

Muscles, tissues, and blood are primarily composed of proteins, which are essential for their structure and function. Carbohydrates, vitamins, and fats play other roles but are not the main building blocks of these body components.

Cockroaches belong to the class Insecta, which typically have three pairs of walking legs. Therefore, a cockroach has three pairs of walking legs.

Human blood is classified into four main groups based on the ABO blood group system: A, B, AB, and O. This classification is fundamental in blood transfusion and compatibility.

Photosynthesis primarily takes place in the leaves of plants because they contain chlorophyll, which captures sunlight to convert carbon dioxide and water into glucose and oxygen.

Eugenics is the study and practice of improving the genetic quality of the human population, often through selective breeding. This matches the description of rearing fine and intelligent human beings through genetics.

James P. Allison and Tasuku Honjo were awarded the 2018 Nobel Prize in Physiology or Medicine for their discovery of cancer therapy by inhibition of negative immune regulation, which is the basis of immunotherapy. This treatment harnesses the immune system to fight cancer, not chemotherapy, radiation, or surgery.

Cotton is primarily grown on Regur soil, also known as black cotton soil, which is rich in clay and retains moisture well, making it ideal for cotton cultivation. While 'Black soil' is a general term, 'Regur soil' specifically refers to the black cotton soil suited for cotton farming.

The study of energy production and transformation in living organisms is called bioenergetics. It focuses on how cells convert energy for biological processes.

Trachoma is a contagious bacterial infection that primarily affects the eyes, leading to roughening of the inner surface of the eyelids and potentially causing blindness if untreated.

Robert Koch is famously known for his work on tuberculosis, where he identified the causative bacterium Mycobacterium tuberculosis. He also worked on cholera, but tuberculosis is most closely associated with his research.

Anaesthetics block sensory nerve signals, preventing the patient from feeling pain during medical procedures. Analgesics relieve pain but do not block sensory nerves, antibiotics fight infections, and antihistamines treat allergic reactions.

Leukemia is a type of cancer that primarily affects the blood and bone marrow, where blood cells are produced. It leads to the production of abnormal white blood cells, impacting the blood system directly.

Rickets is a disease caused by vitamin D deficiency that leads to softening and weakening of bones in children. Therefore, bones are the part of the human body affected by rickets.

Fish are not mammals; they are cold-blooded aquatic animals that breathe through gills. In contrast, cows, goats, and whales are mammals, characterized by warm-bloodedness, hair or fur, and mammary glands.

William Harvey was the first to accurately describe the systemic circulation and properties of blood being pumped by the heart throughout the body, which was a groundbreaking discovery in physiology.

The gallbladder is located beneath the liver, where it stores and concentrates bile produced by the liver before releasing it into the small intestine to aid digestion.

Sponges are simple animals that lack a nervous system, unlike bats, squirrels, and lizards which all have well-developed nervous systems. Therefore, the correct answer is C, Sponges.

Saliva contains amylase enzymes which begin the digestion of starches in the mouth. Trypsin is found in the small intestine, and 'Bite' is not a component of saliva.

The universal receiver blood group is AB because individuals with this blood type can receive red blood cells from any other blood group (A, B, AB, or O) without risk of immune reaction.

Chlorophyll primarily absorbs light in the red and blue wavelengths but reflects green light, which is why plants appear green. Therefore, chlorophyll does not absorb green light effectively.

Tooth enamel is the hardest substance in the human body because it is highly mineralized, primarily composed of hydroxyapatite crystals, which provide exceptional hardness and durability compared to other body tissues like bone or cartilage.