Q15 of 43 Page 1

How does the study of fossils support organic evolution? Explain.

• A study of fossils in different sedimentary layers indicates the geological period in which they existed.


• The study showed that life-forms varied over time and certain life forms are restricted to certain geological time-spans.


• Hence new forms of life have arisen at different times in the history of earth.


More from this chapter

All 43 →
8

State the fate of trophoblast of a human blastocyst at the time of implantation and that of the inner cell mass immediately after implantation.

 12

Compare the ecological biodiversity existing in India and Norway.

 21

How have biotechnologists effectively used Agrobacterium tumefaciens in plants and retroviruses in animals? Explain.

 24

Strict instructions were given to students going on a school trip to Ladakh that they are expected to stay indoors for the first two days of the trip. Why were such instructions given? Explain.