No - the placenta grows around the fetus in the uterus as part of the pregnancy. The ovaries just supply hormones and the egg that gets fertilized.
Estrogen is produced in part by the follicles in the ovaries. Additionally, its production is helped by the placenta, and corpus luteum.
ovaries
The ovaries and the adrenal cortex (part of the adrenal gland, superior to the kidneys) are major sources of testosterone for women.
Most commonly ovaries of women.And placenta is a temporary gland.
Placenta produces those hormones.But it is a temporary gland.
The ovaries of plants usually have placenta and ovules. Sometimes under abnormal conditions of growth they may have another ovary inside which may also bear ovules.
The egg cell is made in the ovaries(women) and sperm in made in the testicles.
Ovaries
ovaries
Ovaries
Estrogen's are produced primarily by developing follicles in the ovaries, the corpus luteum, and the placenta. Luteinizing hormone (LH) stimulates the production of estrogen in the ovaries. Some estrogen's are also produced in smaller amounts by other tissues such as the liver, adrenal glands, and the breasts. These secondary sources of estrogens are especially important in postmenopausal women. Fat cells also produce estrogen,[6] potentially being the reason why underweight or overweight are risk factors for infertility. (Source wikipedia)^^ Life Story; The ovaries secrete oestrogen. simples :)
The placenta.