The first stable product of C3 pathway

From which of the following words we get a new meaningful word if we add the prefix ‘Un’?

If E = 5 and PACKS = 50, then INDUSTRY =

England: Apple:: Iran: ? 

Select the option that is related to fourth letter-cluster in the same way second letter cluster is related to first letter-cluster.

Tree : Shrub :: Mountain : ?

Select the option that is related to the third word in the same way as the second word is related to the first word.

Expand: Enlarge :: Condense: ?

CONCEPT : AMLACNR :: COUNTRY :  ?

Select the number combination of letters that when placed sequentially in the blanks of the given series will complete the series.\