When Mendeleev started his work, how many elements were

___________ is a permit or certificate allowing the holder to emit carbon dioxide or other greenhouse gases.

Which of the following is NOT an objective of drip irrigation?

Which revolution is related to fruit production?

According to Lindeman’s law how much energy is lost while transfer from one to next trophic level ?

Volatile substance emitted by the ripening fruits is known as:

Saline soils occur mostly in

Which of the following is not matched correctly? 

Anaerobic respiration is called as

Which scheme aims to promote the use of bio-pesticides and bio-agents for pest control?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.