Choose the correct answer from the codes given below.

Assertion (A) : The pyramid of grassland ecosystem is upright.

Reason (R) : The producers are maximum in number and tertiary consumers are least in number.

Which of the following is correct

1. The term systole refers to 
2. Phase of contraction of lungs.
3. Phase of relaxation of lungs.
4. Phase of relaxation of heart.
5. Phase of contraction of heart.

The velocity of sound is maximum in 

A particle executes S.H.M. The acceleration of the particle is maximum

The valence electron of the impurity atom that is to be added to germanium crystal so as to make it a n-type semiconductor is 

During the year 2016, total number of Indian Satellites launched by ISRO is