381: Consider the following statements:
1. Dengue is a protozoan disease transmitted by mosquitoes.
2. Retro orbital pain is not a symptom of Dengue.
3. Skin rash and bleeding from nose and gums are some of the symptoms of Dengue.
Which of the statements given above is/are correct?
(a) 1 and 2
(b) 2 only
(c) 1 and 3
(d) 3 only
Explanation:
Denue is a viral disease (arbo virus) transmitted through Aedes agyptii (mosquito). Fever, head ache, pain in joints, back muscles and eye balls (Retro orbital pain), skin rash for a few days, bleeding from nose and gums, prolonged convalescence are some of the symptoms of the Dengue fever.
382: Ticks and mites are actually
(a) Arachnids
(b) Crustaceans
(c) Insects
(d) Myriapods
Explanation:
Ticks and Mites are Arachnids belong to the phylum Arthropoda. These include spiders, ticks, mites and scorpions. Crustaceans of Arthropoda are economically important both benevolent and crop pests (Entomology). They possess jointed legs and include moths, flies, cicadas, fleas, bugs, cockroaches, bees, dragon flies, termites etc.
Myriapods are many legged arthropods which include milipedes and centepedes.
383: If father has blood group A and mother has blood group O, then which one of the following blood group may be found in their son ?
(a) B
(b) AB
(c) O
(d) B, AB or O
384: With reference to the blood in a normal person, which one of the following statements is correct?
(a) Compared to arteries, veins are less numerous and hold less of the body's blood at any given time
(b) Blood cells constitute about 70 per cent of the total volume of the blood
(c) White Blood Cells (WBC) are made by lymph nodes only
(d) The blood has more platelets than WBC
Explanation:
The blood has more plate lets (1.5-4.5 lakh/cmm) than WBC (4000-11000/cmm).
Blood cells consitute 40% of the total blood consumption. WBC are made by Lymphnodes and Spleen.
385: What is the correct sequence of the following in a heart attack ?
I. Narrowing of the inner orifice of the vessel
II. Plaque from fibrous tissue and high cholesterol
III. Inadequate supply of blood and oxygen
IV. Clots of blood carried into the coronary arteries.
Choose the answer from the codes given below :
Codes:
(a) I, II, III, IV
(b) II, IV, I, III
(c) II, III, I, IV
(d) IV, II, I, III