The graph showing the concept of activation energy of enzyme is given below. Observe the graph and choose the correct option for M and N.

| List-I | List-II | ||
| 1. | Head | p. | Filled with enzyme |
| 2. | Acrosome | q. | Contains mitochondria |
| 3. | Middle piece | r. | Sperm motility |
| 4. | Tail | s. | Contains haploid nucleus |
Choose the correct option from the following :
In the given diagram of human sperm, identify the functions of the labelled parts a,b and c.
Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \). 
Choose the correct answer from the options given below:
For x < 0:
f(x) = ex + ax
For x ≥ 0:
f(x) = b(x - 1)2