The undifferentiated primordial germ cells are larger in size and their chromatin rich nuclei are distinct in
Multiplication phase
Growth phase
Maturation phase
All the above
Spermiogenesis is possible due to....
Atretic follicles are found in the
Relative sizes of an egg cell, morula, blastula and gastrula are
Study the flow chart. Name the hormones labelled as $A, B, C, D$ at each stage.
$A \quad B\quad C \quad D$
The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Embryo's heart is formed _________.