In a typical angiosperm, the male gametophyte is the: MCQ with Answer and Explanation

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:
DNA (deoxyribonucleic acid) is the universal genetic material in all cellular organisms (prokaryotes and eukaryotes) and many viruses, storing hereditary information. Some viruses, known as RNA viruses (like HIV, influenza, and TMV), use RNA (ribonucleic acid) as their genetic material instead of DNA. Proteins are the products of gene expression and perform various cellular functions, but they are never the genetic material in any cell or virus. Thus, statements 1 and 2 are correct.

Explanation:
Chiasmata become clearly visible during the diplotene stage of Prophase I. While the actual exchange of genetic material (crossing over) occurs during the pachytene stage, the homologous chromosomes begin to repel each other and move apart in diplotene, remaining connected only at the sites of crossing over, which appear as X-shaped chiasmata. Exam tip: Pachytene = crossing over; Diplotene = chiasmata visible.