General Science Questions (MCQs) for Competitive Examinations

Notes:
Advancing glaciers distort the shape of the rings of trees because melting ice of glaciers not only increase water level in ocean but also contribute to the weather changes of a place that affect formation of annual rings.

Notes:
Hibernation is a state of inactivity and metabolic depression in endotherms. Hibernation refers to a season of heterothermy that is characterized by low body temperature, slow breathing and heart rate, and low metabolic rate. Often associated with cold temperatures, the purpose of hibernation is to conserve energy during a period when sufficient food is scarce and outside temperature is low.

Notes:
Thymosin is the hormone of the thymus. It stimulates the development of disease-fighting T cells. Throughout our childhood years, white blood cells called lymphocytes pass through the thymus, where they are transformed into T cells. Once T cells have fully matured in the thymus, they migrate to the lymph nodes throughout the body, where they aid the immune system in fighting disease.

Notes:
Vitamin C or ascorbic acid is an essential dietary nutrient. Scurvy is caused by the deficiency of Vitamin C. Citrus Fruits are the best source of Vitamin C. After several months of deficiency, a range of symptoms and signs can occur, including anemia, myalgia, bone pain, easy bruising, swelling, petechiae, gum disease, poor wound healing, and depression. Late stages of scurvy are life threatening.

Notes:
Hydra doesn’t have blood. It is a single-cellular animal. In the hydra, respiration is accomplished via diffusion of molecules of oxygen and carbon dioxide through the skin whereas earthworm, cockroach and octopus has blood.

Notes:
Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy and their use to humans as a source for tinder, medicine, food, and entheogens, as well as their dangers, such as poisoning or infection. From mycology arose the field of phytopathology, the study of plant diseases.

Notes:
Open circulatory system is the one in which blood does not circulate only inside blood vessels but it also falls in cavities that irrigate tissues. The internal organs are suspended in a network of blood-filled sinuses or open spaces which collectively form the haemocoel such as in cockroach and other insects.

Notes:
It is generally considered that the Panda belongs to the bear family, though differences persist. Some DNA studies have shown that the giant panda is closer to the bear family while the red panda is indeed closer to the raccoon family.

Notes:
Quenching is a process in which absorbed light energy is dissipated as heat and does not take part in photochemistry. The phenomenon involves quenching of chlorophyll a fluorescence, which is induced under steady-state illumination.

Notes:
Factor IX, also known as Christmas factor, is one of the serine proteases of the coagulation system; it belongs to peptidase family S1. Deficiency of this protein causes Haemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to haemophilia.