UPSC CSE Prelims 2002 Q7 — Science & Technology PYQ with Answer

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 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?