Find the missing number, in the given number series.

The practice of cultivation in the air is termed as .......................... ?

The  Upper limit of available water is ______

Crops grown to supplement the yield of main crops are called

Polymorphism in fungi was first observed by:

Carrot belongs to the family:

Yellow vein mosaic disease of okra is a viral disease. 

Which of the following insects spreads the disease?

Consider the following statements.

Assertion (A): Phosphorous availability is poor in acid soils.

Reason (R): Phosphorous is leached from acidic soils.

Which term describes the unconsolidated layer of rock fragments above bedrock?

In cross-pollinated species, a true breeding line developed by continuous selfing is called: