AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The sperm (male gamete) is tiny, contains mainly genetic material, and has a long tail for movement. The egg (female gamete) is large, immobile, and contains no tail.
Source: Chapter 7, Section 7.3.3(a) & (b)
The key contrast examiners expect is: size (sperm = tiny; egg = large), mobility (sperm has a tail and can move; egg is immobile), and composition (sperm = mostly genetic material; egg = larger cytoplasm). Even for 1 mark, mentioning at least one clear structural difference with both gametes named is essential.