Motion of sperm is
(a) Chemotaxis
(b) Rheotaxis
(c) Hydrotropism
(d) Random

Options

A. Chemotaxis
B. Rheotaxis
C. Hydrotropism
D. Random

Answer

To solve the question regarding the type of motion exhibited by sperm, we can analyze each option provided:

1. **Understanding the Options**:
- **(a) Chemotaxis**: This refers to movement toward or away from a chemical stimulus. Sperm do respond to chemical signals (like those from the egg), but this is not the primary description of their motion.
- **(b) Rheotaxis**: This is the movement in response to the current of water or air. Sperm do not primarily move in response to these currents, so this option is not applicable.
- **(c) Hydrotropism**: This term describes the growth of plant roots toward or away from moisture. Since this concept relates to plant behavior, it does not apply to sperm.
- **(d) Random**: This option refers to the type of motion that is unpredictable and does not follow a specific direction. Sperm exhibit a zigzag pattern of movement, which is characterized as random.

2. **Conclusion**:
- After analyzing each option, we find that the motion of sperm is best described as **random**. Therefore, the correct answer is **(d) Random**.