Reproduction essay 2

Essay # 1. Process of Reproduction in Fishes: Most teleosts, such as plaice or trout produce a large number of yolky eggs. The stimulus for ripening of gonads is supplied by pituitary hormones which depend for their secretion on rhythmical environmental changes.

The main adverse feature of the reproductive system described above is its necessity for external water. Some tree-frogs live together making hollows quite above the ground where rain water collects and into which they can lay eggs.

At this time, which is called puberty the reproductive functions commence. Sex desire is aroused a mating occurs. The reproductive period extends throughout the greater past of the animal’s life. It ends with atrophic changes in the sex organs and the gradual suppression of sexual activity.

Essay # 2. Process of Reproduction in Amphibia: Amphibians are stimulated by increasing daylight and other factors. The endocrines of the frogs, which control reproduction, become active during the later part of the hibernation. Metabolic changes occur and the quantities of stored fat decrease, while the gonads enlarge and ripen.