The process of sperm formation in the testes is called: MCQ with Answer and Explanation

Explanation:
In roots, the protoxylem (first formed xylem) lies towards the periphery and metaxylem towards the centre; this arrangement is called exarch. In stems, protoxylem is towards the centre, called endarch. Exarch condition is typical of roots. Mesarch is found in ferns. This arrangement aids in understanding anatomical differences between root and stem.

Explanation:
Human somatic cells have 46 chromosomes: 44 autosomes and 2 sex chromosomes (XX or XY). Sperm cells are haploid (n=23), containing 22 autosomes and one sex chromosome (either X or Y). The ovum also has 22 autosomes and one X. Fertilization restores 44 autosomes plus XX or XY. So sperm has 22 autosomes.

Explanation:
Drosophila melanogaster (fruit fly) is a widely used model organism in genetics due to its short life cycle, large polytene chromosomes, easy culture, and high fecundity. Thomas Hunt Morgan established its use, discovering linkage and chromosomal theory. Musca domestica is housefly, Periplaneta cockroach, Bombyx silkworm. Many Nobel-winning genetic discoveries were made using Drosophila.