616: With reference to the work of human kidney, consider the following statements:
1. After the waste is removed in the kidney, the cleaner blood is sent back through renal artery.
2. From Bowman's capsule, the filtered liquid passes through tiny tubes where much of the glucose is reabsorbed and sent back to the blood in the renal vein.
Which of these statements is/the correct?
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Explanation:
After the waste is removed in the kidney, the cleaner blood is sent back through renal vein.
617: Urea is prepared by the chemical reaction of:
(a) Ammonia and Carbon dioxide
(b) Ammonium sulphate and calcium chloride
(c) Acetamide and ethyl alcohol
(d) Chlorine and water
618: A company marketing food products advertises that its items do not contain transfats. What does this campaign signify to the customers?
1. The food products are not made out of hydrogenated oils.
2. The food products are not made out of animal fats/ oils.
3. The oils used are not likely to damage the cardiovascular health of the consumers.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Explanation:
Trans fat is the common name for unsaturated fat with transisomer (E-isomer) fatty acid(s). Because the term refers to the configuration of a double carbon-carbon bond, trans fats may be monounsaturated or polyunsaturated but never saturated.
Many of the random compounds created when oils are hydrogenated are "trans fats". Hence statement 1 is correct. These are unnatural compounds which are known to be detrimental to cardiovascular health. Hence statement 3 is also correct.
A type of trans fat occurs naturally in the milk and body fat of ruminants (such as cattle and sheep) at a leval of 2-5% of total fat. Natural trans fats, which include conjugated linoleic acid (CLA) has two double bonds, one in the cis configuration and one in trans, which makes it simultaneously a cis - and a trans-fatty acid. Animal fats are good for health. Animal-based fats were once the only trans fats consumed, but by far the largest amount of trans fat consumed today is created by the processed food industry as a side effect of partially hydrogenating unsaturated plant fats (generally vegetable oils).
619: A hydrogen inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will
(a) Decrease in size
(b) Flatten into a disc-like shape
(c) Increase in size
(d) Maintain the same size and shape
Explanation:
Hydrogen inflated polythene balloon will maintain the same size and shape as polythene balloons will not expand with rise in altitude up in the atmosphere.
620: A good source of Vitamin A is:
(a) Carrot
(b) Potato
(c) Rice
(d) Tomato