FREE NEET Biology Practice MCQ Test: Human Health And Diseases Exercise 4 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Syphilis is caused by bacterium Treponema pallidum. It is a sexually transmitted disease (STD) which is transferred through sexual intercourse with infected person. Haemophilia is a X-linked genetic disorder of blood. It is not transmitted via any sexual practice. Genital herpes is an STD while sickle-cell anaemia is an autosomal hereditary disorder.

The chances of a 5 year boy contracting an STD are very little since he is unlikely to have sex at this age.

Answer: (c)

Answer: (a)

Answer: (d)

Answer: (a)

Polymorphonuclear leukoytes named so, as they have multilobed nucleus or neutrophils and monoytes are the cellular barrier provide innate or nonspecific immunity. Cellular barriers are the internal defence or second live of defence.

Answer: (c)

Answer: (a)

A disease, which can be easily transmitted from one person to another is called infectious disease. Infectious diseases are also known as transmissible disease or communicable disease.

Answer: (c)

Fibroblasts are the cells present in connective tissue. Sarcomas are cancers that are located in connective and muscular tissues derived from mesoderm. Thus, they include the cancers of bones, cartilages, tendons, adipose tissue, lymphoid tissue and muscles.

Answer: (c)

Interferons are the proteins secreted by virus infected cell, that protect non-infected cells from further viral infection.

Serotonin is a neurotransmitter that leads to depression.

Colostrum is a neurotransmitter that leads to depression.

Histamine is also a neuro transmitter involved ininflammatory response.

Answer: (a)

Answer: (b)

Answer: (c)

HIV is a spherical, enveloped virus of about 90-120 nm diameter. Its nucleocapsid is icosahedral and its genome consists of a single-stranded RNA filament segmented into two identical filaments and associated with a "reverse transcriptase enzyme".

Answer: (b)

Humoral immunity is also called as antibody mediated immunity. It refers to immunity provided by substances in the body fluid. Since, antibodies are found in the blood, therefore antibody mediated immunity is also referred to as humoral immunity.

Answer: (b)

Ringworm is a skin infection caused by a fungus. The Microsporum, pathogen responsible for ringworm disease in human beings belongs to the same kingdom as that of Rhizopus, a mould. Rhizopus is a genus of common saprophytic fungi on plants and specialized parasites on animals. They are found on a wide variety of organic substrates, including "mature fruits and vegetables", jellies, syrups, leather, bread, peanuts and tobacco.

Answer: (c)

Answer: (b)

Lysergic Acid Diethylamide (LSD) is an extremely potent psychedelic ergot alkaloid derived from the fungus, Claviceps purpurea. LSD is one of the most powerful hallucinogenic drugs known. It was invented in 1938 by the Swiss chemist, Albert Hoffman, who was interested in developing medicines from compounds in ergot, a fungus that attacks rye.

Answer: (b)

Answer: (d)

Answer: (b)

Short-lived immunity acquired from mothers to fetus across placenta or through mother's milk to the infant is categorised as passive immunity. Passive immunity, an acquired immunity, is resistance based on antibodies performed in another host. In this case, the fetus is not directly responsible for its body immunity but it becomes immunised by mother's milk across placenta.

Answer: (b)