Organisms and Populations — BIOLOGY STD 12 Science — Question

How can retroviruses be used efficiently in biotechnology experiments in spite of them being disease causing?

Differentiate between:
Hypocotyl and epicotyl.

Write the two components of nucleoside.

Give an example of an indicator of industrial pollution?

How is primary productivity in an ecosystem determined?

Provide an instance where the population size of a species can be estimated indirectly, without actually counting them or seeing them.

Mention any two probable reasons for rapid rise of population in our country from and about 350 million at the time of independence to about one billion by the year 2000.

What role does an individual organism play as per Darwin’s theory of natural selection?

What represents the (a) basal part and (b) female gametophyte of the ovule?

What is heterogamety? Also give one example of it.