Biology Quiz 4

Pheromones are chemicals released by one species of animals in order to attract the other members of the same species. They are capable of acting like hormones outside the body of the secreting individual, to affect the behavior of the receiving individuals.

Aflatoxins are produced by fungi. They are a family of toxins produced by certain fungi that are found on agricultural crops such as maize (corn), peanuts, cottonseed, and tree nuts.

The huge muscles that power the wings attach to a flat part of the breastbone called the keel. Some flightless birds, including ostriches, do not have a keel.

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.

The mineral constituent of chlorophyll is Magnesium (Mg). The chlorophyll molecule consists of a central magnesium atom surrounded by a nitrogen-containing structure called a porphyrin ring; attached to the ring is a long carbon-hydrogen side chain, known as a phytol chain. Other elements (not minerals) like carbon, nitrogen, oxygen and hydrogen are also present in chlorophyll.

Loris, Alligator and Cow have teeth. Peacock, Ostrich, Tortoise, Owl, Crow and Kiwi do not have teeth. Birds do not have teeth, although they may have ridges on their bills that help them grip food. Turtles and tortoises don't have teeth. Instead, their mouths have a hard, sharpened edge that they use to bite with, kind of like a bird's beak.

Saliva helps in the digestion of starch (complex carbohydrates). It contains special enzymes called amylase that help digest the starches in food. Amylase breaks down starches into sugars, which the body can more easily absorb.

Pulmonary Vein brings clean blood from the lungs into the heart. Its function is to transport oxygenated blood from the lung alveoli into the left atria.

Nerve cell is the longest cell in the human body. It is made of billion neurons. The largest cell in the human body is ovum (egg cell). Smallest cell in the human body is gametes (sperm cell). The largest cells is an egg cell of ostrich.

A Roundworm (called Ascaris lumbricoides) is a human parasite found in the Small intestine. It infects a human's small intestine and acts as a parasite, getting nutrients from its host's intestinal tract.