Biology MCQs

Notes:
The annelids (Annelida, from Latin anellus, “little ring”), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.

Notes:
Poliovirus is known as the prototypical enterovirus. It can cause a subclinical or mild illness, aseptic meningitis, or paralytic poliomyelitis. It is a disease that has been eradicated in the United States and other developed countries. Coxsackie virus infection is the most common cause of viral heart disease.

Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.

Notes:
Milk contains the water soluble vitamins thiamin (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), vitamin B6 (pyridoxine), vitamin B12 (cobalamin), vitamin C, and folate. Milk is a good source of thiamin, riboflavin and vitamin B12.

Notes:
Heart has four chambers, left & right ventricles and left & right atria which are synchronized to act together. A condition in which synchronizm does not take place is know as fibrillation. Fibrillation of atrial muscles is called as atrial fibrillation, fibrillation of the ventricular muscles is termed as ventricular fibrillation. In atrial fibrillation the ventricles functions normally, but respond with an irregular rhythm. In atrial fibrillations circulation is maintained, although not as efficiently. Ventricular fibrillation is more dangerous, as the ventricle are unable to pump the blood. There are many methods of correcting fibrillation mechanically, includingA.C. defibrillation & D.C. defibrillation. (Source: The Hindu Speaks on Science). Kindly read about working of Human Heart, particularly, how blood passes in 4 different parts of Human heart.

Notes:
Cell differentiation is the process by which dividing cells change their functional or phenotypic type. All cells probably derive from stem cells and acquire their functions when they mature. Walther Flemming discovered cell differentiation.

Notes:
Plant physiologists have investigated phototropism for over 100 years. The best known early research on phototropism was by Charles Darwin.

Notes:
Measles is caused by a single-stranded, enveloped RNA virus with a serotype 1. It is classified as a member of the genus Morbillivirus in the Paramyxoviridae family. Humans are the only natural host of the measles virus.

Notes:
Hepatitis B virus, Human T cell lymphotronic virus type I and Epstein-Barr virus are the viruses shows the transformation of infected cells.

Notes:
Leaf rust caused by Puccinia triticina is the most common rust disease of wheat. The disease occurs where wheat, barley, and other cereal crops are grown.