Identify the correct statement about the circulatory system: MCQ with Answer and Explanation

Explanation:
Louis Pasteur, a French microbiologist, is famous for several groundbreaking contributions. He developed the process of pasteurization (heating liquids to kill harmful microbes). He also conclusively disproved the theory of spontaneous generation using his famous swan-neck flask experiment, demonstrating that life only arises from pre-existing life (biogenesis). He also developed vaccines for rabies and anthrax.

Explanation:
The Golgi apparatus consists of cisternae that modify, sort, and package proteins and lipids received from the ER for secretion or delivery to other organelles. The smooth endoplasmic reticulum (SER) lacks ribosomes and is the primary site for the synthesis of lipids, including phospholipids and steroids. The rough endoplasmic reticulum (RER) has ribosomes attached and is primarily involved in protein synthesis, not lipid synthesis. Thus, statements 1 and 2 are correct.

Explanation:
During prophase I of meiosis, homologous chromosomes pair up and crossing over (exchange of genetic material) occurs at the pachytene stage. In anaphase I, the homologous chromosomes separate and move to opposite poles, while sister chromatids remain attached. Telophase II is the final stage of meiosis II, resulting in four genetically distinct haploid cells, not diploid cells. Thus, statements 1 and 2 are correct.