Biology Quiz 4

Birds which swim in water have webbed feet. Ducks, geese, and swans all have webbed feet. The primary use for webbed feet is paddling through the water.

The DPT (Tdap) vaccine is administered to children from 6 weeks to 6 years of age to provide immunization against diphtheria, tetanus, and whooping cough (pertussis).

Scurvy is caused due to the deficiency of Vitamin C (also known as ascorbic acid). It is caused by not having enough vitamin C in the diet for at least three months. Vitamin C is mainly found in fruit and vegetables.

Polycyclic hydrocarbons (PAHs) are the constituents of automobile exhaust that can cause cancer. PAHs are ubiquitous environmental pollutants generated primarily during the incomplete combustion of organic materials (e.g. coal, oil, petrol, and wood). These PAHs are carcinogenic in nature i.e. leads to cancer.

The fluid part of blood without corpuscles is called Plasma. Blood plasma is fluid part of blood in which corpuscles (blood cells) are absent, but contains proteins and other constituents of whole blood in suspension. Plasma is the largest part (about 55%) of blood.

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.

Jaundice is caused due to infection of the liver. It happens when there's too much bilirubin, a yellow-orange substance, in your blood. Jaundice may occur if the liver can't efficiently process red blood cells as they break down.

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.

Myopia, also known as shortsightedness or nearsightedness, is a very common vision disorder. It is the inability to see distant objects clearly unless they are relatively close to your eyes. This causes light to focus in front of the retina instead of directly on it.

Fructose is natural sugar present in fruits, certain vegetables, and honey. Grapes, apples, watermelon, asparagus, jackfruit, pears and zucchini are some fruits which contain high fructose.