The double fertilization characteristic of angiosperms results in the formation of: MCQ with Answer and Explanation

Explanation:
The placenta is a vascular organ formed from fetal chorion and maternal decidua, facilitating exchange without mixing blood. The umbilical cord connects fetus to placenta.

Explanation:
Prolactin, secreted by the anterior pituitary, is the primary hormone responsible for milk synthesis (lactation) after childbirth. Oxytocin causes milk ejection (let-down reflex). Estrogen and progesterone stimulate mammary duct and alveolar development during pregnancy but inhibit milk secretion; after delivery, their levels drop, allowing prolactin to act.

Explanation:
Spectrophotometry measures the absorbance of light by a solution at a specific wavelength, which is proportional to the concentration of the absorbing substance (Beer-Lambert law).