Streamlined
• An adaptation refers to a trait or characteristic that helps an organism survive and thrive in its environment. In the case of an egg cell, being streamlined is an adaptation because it allows the egg to be easily transported through the female reproductive system and increases the chances of successful fertilization.
The other options mentioned in the question are not adaptations of an egg cell:
2. Haploid nucleus: A haploid nucleus is a characteristic of egg cells, but it is not considered an adaptation as it is a fundamental part of the reproductive process.
3. Tail: Egg cells do not typically possess a tail. Tails are typically found in sperm cells, which are responsible for swimming towards the egg cell.
4. Many mitochondria in the head: While mitochondria are found in egg cells, having many mitochondria in the head is not considered an adaptation specific to egg cells. The presence of mitochondria in the egg cell is necessary for energy production.
Therefore, the correct answer is option 1, Streamlined.