The thyroid gland is homologous to which part of lower vertebrates?

The injection of which of the following increases the metabolic rate?

Toxic agents present in food which interfere with thyroxine synthesis lead to the development of

$I.$ Hypothyroidism causes irregularity of the menstrual cycle.
$II.$ Hyperthyroidism adversely affects body physiology.
$III.$ Hypothyroidism causes cretinism.
$IV.$ Hypothyroidism causes goitre.
Which of the above statements are correct?

According to pathology,goiter is associated with which of the following?

What are the effects of hypothyroidism (observed during pregnancy) on the development and maturation of a growing baby?