Ergot is an important disease

Change the question mark with the option that follows the applied logic in the first pair.

E: P :: I: ??

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

xy_z_xxy_zbx_yx_bx_y_z_x

Select the number from the given options which can come in place of the question mark (?) in the following series. 

13, 27, 56, 115, 234, ?

The position(s) of how many letters will remain unchanged if each of the letters in the word OPERATOR is arranged in the English alphabetical order?

Arrange the given words in the sequence in which they occur in the dictionary. 

1. Lens 

2. Lenient 

3. Length 

In a certain code language, ‘PLAY’ is coded as ‘4831’ and ‘CLAY’ is coded as ‘1824’. What is the code for ‘C’ in that language?

Statement: Ram has only one month's time to prepare for the exam, so he practices math everyday.

Conclusion:

Mary is taller than Aayushi. Gunjan is taller than Aayushi but shorter than Shalini, who is taller than Mary. Who among them is the tallest?

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.