FREE NEET Biology Practice MCQ Test: Human Health And Diseases Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (a)

Answer: (b)

Common cold is caused by some 100 types of Rhinoviruses. Symptoms of common cold are irritation of nasal tract, nasal congestion, flow of mucus, sore throat, sneezing, cough, headache and slight fever.

Answer: (b)

Answer: (b)

Answer: (b)

Answer: (c)

Food poisoning is an illness caused by bacteria or other toxins in food. Symptoms which generally begin within 2 to 6 hours include abdominal cramping, diarrhoea, fever, headache, nausea, vomiting, and weakness. Food poisoning is caused by Clostridium botulinum.

Answer: (d)

Answer: (b)

Ringworm (tinea) is a fungal infection of the skin, the scalp, or the nails. Ringworm is caused by the dermatophyte fungi-species of microsporum, trichophyton, and epidermophyton and also affects animals, a source of infection for humans. It can be spread by direct contact or via infected materials. The lesions of ringworm may form partial or complete rings and may cause intense itching. The disease is treated with antifungal agents taken by mouth or applied locally.

Answer: (c)

IgA immunoglobulins are the second most abundant class of immunoglobulins, which are mainly found in sweat, tears, saliva, mucus, colostrum and gastrointestinal secretions.

Answer: (d)

Answer: (c)

Answer: (b)

The infective stage of Plasmodium is a minute organism called sporozoite. When the mosquito bites man, sporozoites present in the salivary gland of female Anopheles mosquito are injected into the blood of the man. These sporozoites are spindle-shaped or sickle-shaped uninucleate organisms capable of wrigging (worm-like) movements. Each sporozoite consists of elastic pellicle, cytoplasm and nucleus.

Answer: (a)

Answer: (d)

The given chemical structures (A) and (B) are of morphine and cannabinoid respectively. Morphine is the principal opium alkaloid. It is a strong analgesic. It also has sedative and calming effect. Morphine depresses respiratory centre, it contributes to the fall in blood pressure. Morphine is a very effective sedative and painkiller. It is very useful in patients who have undergone surgery. Natural cannabinoids are obtained from the inflorescence of hemp plant Cannabis sativa, family Cannabinaceae. They affect the cardiovascular system of the body.

Answer: (a)

Answer: (b)

Answer: (a)

Answer: (c)

Answer: (c)

Answer: (d)

AIDS virus infects $T_{4}$ lymphocytes (also called Helper cells). Cytotoxic T cells called $T_{8}$ lymphocytes.