The scientist who discovered that DNA is the genetic material in bacteriophages was: MCQ with Answer and Explanation

Explanation:
Amphibians like frogs have a three-chambered heart (two atria, one ventricle) with some mixing of blood. Humans and pigeons have four-chambered hearts, crocodiles uniquely have a four-chambered heart among reptiles.

Explanation:
Spermiogenesis is the final stage of spermatogenesis, where the spherical, non-motile spermatids undergo a complex morphological transformation to become highly specialized, motile spermatozoa (sperm). This involves the formation of the acrosome, condensation of the nucleus, development of the flagellum (tail), and the shedding of excess cytoplasm. Spermiation is the subsequent release of these mature sperm into the tubule lumen.

Explanation:
Sericulture is the process of rearing silkworms (primarily Bombyx mori) for the production of silk. The silkworm feeds on mulberry leaves (Morus alba) and spins a continuous filament of silk protein (fibroin) to form a cocoon around itself during its pupal stage. The cocoons are then boiled to kill the pupa and unwind the silk filament for textile production.