Biology Quiz 7

Charles Robert Darwin was an English naturalist, geologist and biologist, best known for his contributions to the Theory of Evolution.

Dehydration is a deficiency of water in the body. It occurs when the human body uses or loses more fluid than takes in, and the body doesn't have enough water and other fluids to carry out its normal functions.

A biopsy test is typically associated with the diagnosis of cancer. Doctors use biopsies to test whether abnormalities in the body are caused by cancer or by other conditions.

Common Cold is caused by viruses. Although many types of viruses can cause a common cold, rhinoviruses are the most common cause. Typhoid is caused by a bacterium called Salmonella typhi. Cholera is caused by Vibrio cholerae bacteria. Tetanus is an infection caused by a bacterium called Clostridium tetani.

cold-blooded animals' body temperature remains constant all the time. They cannot regulate their internal body temperature with the change in the environment. Animals, such as reptiles, fishes, and amphibians, cannot control their body temperature and therefore become sluggish in cold weather.

Fish growth and activity usually require 5-6 mg/L of dissolved oxygen. Dissolved oxygen levels below 3 mg/L are stressful to most aquatic organisms. Healthy water should generally have dissolved oxygen concentrations above 6.5-8 mg/L and between about 80-120 percent.

Adrenaline is a neurotransmitter in the sense that, within the brain, it helps neurons to communicate with one another.

Pregnant women usually become deficient in Calcium and Iron. During Pregnancy, the body needs iron to make hemoglobin — that's the substance in red blood cells that helps carry oxygen to organs and tissues. A developing baby needs calcium to build strong bones and teeth.

A person's eye colour results from the pigmentation of a structure called the iris, which surrounds the small black hole in the centre of the eye (the pupil) and helps control how much light can enter the eye. The colour of the iris ranges on a continuum from very light blue to dark brown.

Haemolymph is observed in Arthropods. It is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal's tissues.