411: With reference to the latest developments in stem cell research, consider the following statements:
1. The only source of human stem cells are the embryos at blastocyst stage
2. The stem cells can be derived a without causing destruction to blastocysts
3. The stem cells can regenerate themselves in vitro virtually forever
4. Indian research centres also created a few cell lines which can be developed into many types of tissues
Which of these statements are correct?
(a) 1, 2, 3 and 4
(b) 1, 2 and 3
(c) 1, 2 and 4
(d) 3 and 4
412: In summer, man with excess perspiration feels weak, because of the:
(a) Loss of more water through evaporation
(b) Loss of salts through evaporation
(c) Loss of carbohydrates through evaporation
(d) All factors mentioned above
413: Which one of the following statements is correct?
(a) Liquid Sodium is employed as a coolant in nuclear reactors
(b) Calcium carbonate is an ingredient of toothpaste
(c) Bordeaux mixture consists of sodium sulphate and lime
(d) Zinc amalgams are used as a dental filling
414: Avinash is Ravi's eldest brother. Ravi is younger to Ajay. Ravi and Ajay are not brothers. Which of the following statements is definitely true?
(a) Ajay is younger to Avinash
(b) Avinash is younger to Ajay
(c) Ajay is younger to Ravi
(d) None of the above
415: Which of the following States has "Urdu" as its official language?
(a) Bihar
(b) Jammu & Kashmir
(c) Madhya Pradesh
(d) Rajasthan