Stalk root of onion is caused by________?

Tropical and subtropical fruits have the highest level of________?

Darcy formula for loss of head in pipes is given by, hf=4fl v2 / ________?

When high flood passing down weir creating high up lift pressures and there is no flow in the canals, if such condition is taken for design and is called________?

Which one of the following is the climacteric ethylene producing fruit________?

Agriculture contribution in GNP of developing nations?