Find the missing number?

The figure that best represents interrelation among "Star, Moon and Mars". 

There are deer and peacocks in a zoo. By counting heads they are 80. And the number of their legs is 200. How many peacocks are there? 

Mohan, Ritika, Janvi, Priya and Riya are friends. Janvi runs faster than Ritika but slower than Priya. Mohan is the slowest runner and Riya runs faster than Priya. Who runs the fastest among the five?

Direction: From the given alternatives select the word which cannot be formed using the letters of the given word
SEGREGATION 

Select a figure from amongst the Answer Figures which will continue the same series as established by the five Problem Figures.

Find the odd word/letters/numbers from the given alternatives. 

How many cubes are there in this diagram?