Ten $E.coli$ cells with $^{15}N$ - dsDNA are incubated in medium containing $^{14}N$ nucleotide. After 60 minutes, how many $E.coli$ cells will have DNA totally free from $^{15}N$?

What is the full form of IUDs?

Given below are two statements: Statement I: The primary source of energy in an ecosystem is solar energy. Statement II: The rate of production of organic matter photosynthesis in an ecosystem is called net primary productivity (NPP). In the light of the above statements, choose the most appropriate answer from the options given below.

Which one of the following is not a method of in situ conservation of biodiversity?

A 'new' variety of rice was patented by a foreign company though such varieties have been present in India for a long time. This is related to?

Given below are two statements: Statement I: In an ecosystem, there is unidirectional flow of energy of sun from producers to consumers. Statement II: Ecosystems are exempted from 2nd law of thermodynamics. In the light of the above statements, choose the most appropriate answer from the options given below:

The site of perception of light in plants during photoperiodism is

In RNAi, the genes are silenced using:

Consider the pyramid of energy of an ecosystem given below : If T4 is equivalent to 1000 J, what is the value of T1?