166: Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?
(a) Nickel and cadmium
(b) Zinc and carbon
(c) Lead peroxide and lead
(d) Iron and cadmium
Explanation:
Nickel and Cadmium are used as electrodes. Here cathode is Nickel hydroxide and the Anode is made of Cadmium with KOH as electrolyte.
167: The main difference between raw soybeans and cooked soybeans is in respect of
(a) Amino acid composition
(b) Biological value of proteins
(c) Protein content
(d) Calorific value
168: Genetically modified "golden rice" has been engineered to meet human nutritional requirements. Which one of the following statements best qualifies golden rice ?
(a) Its modified genes cause the fortification of its grains with vitamin D grains have been fortified with genes to provide three times higher grain yield per
(b) Its modified genes cause the synthesis of all the nine essential amino acids
(c) The grains have been fortified with genes to provide three times higher grain yield per acre than other high yielding varieties
(d) Its grains contain pro-vitamin A which upon ingestion is converted to vitamin A in the human body
Explanation:
Golden rice is a variety of Oryza sativa rice produced through genetic engineering to biosynthesize beta-carotene, a precursor of pro-vitamin A in the edible parts of rice. Golden rice was developed as a fortified food to be used in areas where there is a shortage of dietary vitamin A.
Because many children in countries where there is a dietary deficiency in vitamin A rely in rice as a staple food, the genetic modification to make rice produce provitamin A (beta-carotene) is seen as a simple and less expensive alternative to vitamin supplements or ann increase in the consumption of green vegetables or animal products. It can be considered as the genetically engineered equivalent of fluoridated water of iodized salt.
Initial analyses of the potential nutritional benefits of golden rice suggested consumption of golden rice would not eliminate the problems of blindness and increased mortality, but should be seen as a complement to other methods of vitamin A supplementation. Since then, improved strains of golden rice have been developed containing sufficient provitamin A to provide the entire dietary requirement of this nutrient to people who eat about 75g of golden rice par day.
169: Match List I with List II and select the correct answer using the codes given below the lists :
List I List II
I. Fruit (A) Ovule
II. Seed (B) Leaf
III. Wood (C) Stem
IV. Starch (D) Ovary
Codes:
(a) I-B, II-A, III-C, IV-D
(b) I-D, II-A, III-C, IV-B
(c) I-B, II-C, III-A, IV-D
(d) I-D, II-C, III-A, IV-B
170: Foot and mouth disease is prevalent among:
(a) Cattle only
(b) Cattle and pigs only
(c) Sheep and cattle only
(d) Cattle, goats, sheep and other hoofed animals