Find the average of all the numbers between 21 and 70

The hormone responsible for promoting fruit ripening and senescence is:

In which relation, an increase or a decrease in production of one product affect the production of the other inversely

Agranal chloroplasts are found in _____

The great Irish famine was caused by 

Water potential of chemically pure water is:

King of Pippin is the variety of ......

Powdery mildew is a common fungal disease that affects which part of the plant?

Which plant growth regulator promotes cell division and is often used in tissue culture for plant propagation? 

In most minerals soils particle density varies within

Which allelopathy type involves the release into the environment of compound that is toxic after chemical modification by micro-organisms?