Biology Quiz 5

The edible part in the onion is concentric fleshy, enlarged and scaly leaf bases.

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.

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.

Deep-fried food materials are carcinogenic because they are rich in Polycyclic aromatic hydrocarbons (PAHs). PAHs are made whenever substances are burned. They may cause cancer and may affect the eyes, kidneys, and liver.

Chlorophyll is an extremely important biomolecule, critical in photosynthesis, which allows plants to absorb energy from light. Chlorophyll absorbs light most strongly in the blue portion of the electromagnetic spectrum, followed by the red portion.

Vitamin B₆ is one of the B vitamins. Deficiency of Vitamin B₆ in men causes anemia because it is needed to form red blood cells.

The human skeleton of an adult consists of around 206 bones. There are typically around 270 bones in human infants, which fuse to become 206 to 213 bones in the human adult.

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.

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.

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.