The scientist who discovered the sex chromosomes was: MCQ with Answer and Explanation

Explanation:
Iron (Fe²⁺) is at the center of the heme group in hemoglobin, enabling reversible oxygen binding. Calcium is in bones, magnesium in chlorophyll, zinc in many enzymes. Iron deficiency leads to anemia.

Explanation:
Dairy farming is the agricultural practice of breeding and raising livestock (like cows and buffaloes) specifically for the long-term production of milk. Poultry farming involves the rearing of domesticated birds (like chickens, ducks, and turkeys) for the production of meat (broilers) and eggs (layers). Fisheries (pisciculture) involves the breeding and rearing of fish and other aquatic organisms for food; silk production is the domain of sericulture (rearing silkworms). Thus, statements 1 and 2 are correct.

Explanation:
Cyanobacteria (blue-green algae) are prokaryotes, possessing a nucleoid region but no true nucleus or membrane-bound organelles. Amoeba, yeast (fungus), and Paramecium are eukaryotes. Cyanobacteria perform oxygenic photosynthesis and some fix nitrogen, having chlorophyll a and phycobilins. They are classified under Kingdom Monera. Examples: Nostoc, Anabaena.