Biology Online Quiz

Diphtheria is a highly contagious, infectious disease caused by the bacteria Corynebacterium diphtheriae. It is a serious bacterial infection that usually affects the mucous membranes of the nose and throat.

By mass, about 96 percent of the human body is made up of just four elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent), and nitrogen (3.3 percent). Oxygen (O) together with hydrogen form water, which is the primary solvent found in the body and is used to regulate temperature and osmotic pressure.

Yawning occurs when CO₂ concentration in the blood is high, and Oxygen (O₂) concentration is low. The yawn acts as a boost to the O₂ levels.

Cytology is the study of cells as fundamental units of living things. A cytology test is used to look closely at cells and body fluids.

A glass snake (glass lizard) is a long, slender, legless lizard that superficially resembles a snake but is not a true snake. It has no legs but is not a snake, making it a unique and interesting member of the reptile kingdom.

Beri-Beri is a disease caused by a vitamin B1 deficiency, also known as thiamine deficiency. The body needs thiamin to break down and digest the foods, keep the metabolism going, and help muscles and the nervous system do their jobs effectively.

In male sharks, two claspers are found attached to the Pelvic fin. The claspers are simply a modified portion of the pelvic fin, and since there are two pelvic fins, there are two claspers.

Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen (anaerobically), primarily consisting of methane and carbon dioxide. Biogas can be produced from raw materials such as agricultural waste, municipal waste, plant material, sewage, green waste or food waste. Although, cattle dung has been recognised as the chief raw material for biogas plants.

Conduction and respiration are associated with plants during the dark period. Conduction is the process by which vital nutrients are transported to the different parts of a plant. This process is independent of the light factor. Respiration always occurs in plants, but night respiration is more evident since the photosynthesis process ceases.

An endemic species refers to a species that is native to where it is found. A species can be endemic to a particular small geographical area, such as a single island, or to a larger area, such as a continent. India has nine hornbill species, of which four are found in the Western Ghats: Indian Grey Hornbill (endemic to India), the Malabar Grey Hornbill (endemic to the Western Ghats), Malabar Pied Hornbill (endemic to India and Sri Lanka) and the widely distributed but endangered Great Hornbill.