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

Explanation:
Metabolism, comprising anabolism and catabolism, is a universal feature of all living cells. Non-living objects may possess mass, crystallize, or conduct electricity, but they lack metabolic processes. Metabolism involves enzyme-catalyzed biochemical reactions that sustain life. Thus, metabolic activity is a definitive characteristic of life.

Explanation:
Bacteria are unicellular prokaryotic organisms, characterized by the absence of a true nucleus and membrane-bound organelles. Fungi are eukaryotic organisms, possessing a true nucleus and membrane-bound organelles, and can be unicellular (yeasts) or multicellular (molds, mushrooms). Viruses are acellular, non-cellular entities; they consist of genetic material (DNA or RNA) enclosed in a protein coat (capsid) and lack any cellular structure or metabolic machinery. Thus, statements 1 and 2 are correct.

Explanation:
Progesterone stimulates the development of alveolar tissue of the breasts during pregnancy. Estrogen promotes duct development. Prolactin initiates milk synthesis, oxytocin ejection.