Beena is twice as old as Sunita. Three years ago, she

The relationship between two organisms, where both of them benefit from each other is called:

The approximate number of orange plants in one hectare would be: 

A Punjab farmer wants to grow 4 crops in a year, the most suitable crop rotation is

Which of the following is a weakest bond.

Which breeding technique involves crossing in isolation a number of lines tested for their general combining ability (GCA)?

Watson and Crick's double-helical model was proposed based on

Select the option that can substitute the underlined part of the sentence. If no substitution is needed, select 'No improvement required'.

The apex body in Co-operative marketing is

 Which of the following crop responds well to sulphur?

Critical period of crop weed competition in wheat plant is ______