536: Arteries supplying blood to the heart are called
(a) carotid arteries
(b) hepatic arteries
(c) coronary arteries
(d) pulmonary arteries
Explanation:
A pair of coronary arteries carry oxygenated blood to the heart muscle. Failing of the functioning of these arteries causes a situation called heart failure, and requires bi-pass surgery.
Right and left pulmonary arteries carry de-oxygenated blood to right and left lungs. (pulmonary - lung related)
537: Consider the following:-
1. Carbon dioxide
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above is/are the emission/emissions from coal combustion at thermal power plants?
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
Explanation:
Coal fired thermal power plants are one of the main contributors for atmospheric pollution and greenhouse gases. Emissions that come from these plants could be categorized into three different categories:
1) Gaseous emissions Carbon Dioxide, Carbon Monoxide, Sulphur Dioxide and Nitrogen Dioxide which lead to global warming and acid rain.
2) Particulate emissions - this fine dust that is emanated from the stacks of power plants is a health hazard.
3) Trace elements like Mercury, Cadmium and Lead which are also health hazards.
538: Recommended daily intake of proteins for a moderately active woman is
(a) 30 g
(b) 37 g
(c) 40 g
(d) 46 g
Explanation:
Recommended daily intake of proteins for :
Moderately active women : 50 g
Pregnant women : 65 g
Lactating women : 75 g
539: Consider the following pairs:
Commonly used material vs. Unwanted or controversial chemicals found in them
1. Lipstick: Lead
2. Soft drinks: Brominated vegetable oils
3. Chinese fast food: Monosodium glutamate
Which of the pairs given above is/are correctly matched?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
540: The sequencing of the entire genome (the totality of all genes) of an organism was completed in 1996. The organism was
(a) albino mouse
(b) yeast
(c) human being
(d) Plasmodium vivax
Explanation:
Celera genomics first deciphered the female anopheles mosquito (vector) genome in which they found the entire genome of malarial causing parasite plasmodium vivax. Human genome project, launched in 1988 was successful in decoding genetic information present in 24 different types of human chromosomes in the year 2000, June.