Correct option is A
The juvenile hormone is secreted by the corpus allatum in insects. This hormone plays a key role in regulating development, growth, and metamorphosis in insects, particularly by preventing premature metamorphosis and helping to maintain juvenile characteristics. It is not secreted by the pituitary, pineal, or labial glands.
Information Booster:
The corpus allatum is a pair of endocrine glands in insects that produce juvenile hormone, regulating the transition between developmental stages.
Juvenile hormone helps maintain the larval stage in insects by preventing them from undergoing metamorphosis.
This hormone has an important role in regulating molting, and its levels influence whether an insect will undergo another molt or undergo metamorphosis into its adult form.
The pituitary gland (option 2) is responsible for producing other hormones like growth hormone, but it does not secrete juvenile hormone.
The pineal gland (option 3) is involved in the production of melatonin and regulates sleep-wake cycles, not juvenile hormone.
Labial glands (option 4) are involved in the secretion of saliva in some animals but are unrelated to juvenile hormone production.
Additional Knowledge:
Pituitary (option 2), pineal (option 3), and labial (option 4) glands are all involved in different physiological functions but do not secrete juvenile hormone.
