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

Explanation:
Vascular cryptogams are plants that possess vascular tissues (xylem and phloem) but reproduce via spores rather than seeds. Pteridophytes, such as Selaginella (spike moss), ferns, and Equisetum, fit this description. Funaria and Marchantia are bryophytes (non-vascular cryptogams), and Pinus is a gymnosperm (a vascular phanerogam or seed-producing plant).

Explanation:
Transduction is the transfer of bacterial DNA from one bacterium to another by a bacteriophage. Generalized transduction occurs when phage accidentally packages host DNA; specialized transduction involves specific genes near the prophage integration site. Conjugation needs direct contact, transformation free DNA.

Explanation:
Iron is a trace mineral (micronutrient) needed in small amounts for hemoglobin and myoglobin function. Calcium and phosphorus are macro-minerals required in larger amounts for bones. Sodium is a major extracellular electrolyte. Trace elements include iron, zinc, copper, iodine, selenium, manganese, etc. Iron deficiency causes anemia. Iron is absorbed in duodenum and stored as ferritin.