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2.Human Reproduction
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The placenta helps in the maintenance of pregnancy by secreting a hormone, known as
A
Thyroxine
B
Estrogen
C
Progesteron
D
Testosterone
Solution
(c)Progesterone serves to maintain pregnancy by preventing contraction of uterine wall.
Standard 12
Biology
Similar Questions
Match the columns.
| Column 1 | Column II |
| $(a)$ $6-14$ days | $(1)$ It is known as menstrual cycle |
| $(b)$ $1-5$ days | $(2)$ Polar body is down |
| $(c)$ $15-28$ days | $(3)$ It is known as proliferative phase |
|
$(4)$ Endometrium is prepared forimplantation of embryo |
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