Which of the following hormones is not secreted by the human placenta?
- A$hCG$
- BEstrogen
- CProgesterone
- D$LH$
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During pregnancy,the fetus receives some antibodies from its mother through the .............. .
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View SolutionMatch the following with respect to stages of embryonic development in human.
Column $I$ Column $II$ $a$. Fully formed morula $i$. By end of $7^{\text{th}}$ day after fertilization $b$. Fully formed blastocyst $ii$. $15$ days after fertilization $c$. Completion of implantation process $iii$. By end of $4^{\text{th}}$ day after fertilization $d$. Fully formed gastrula $iv$. By end of $10^{\text{th}}$ day after fertilization
Choose the correct option-
| Column $I$ | Column $II$ |
| $a$. Fully formed morula | $i$. By end of $7^{\text{th}}$ day after fertilization |
| $b$. Fully formed blastocyst | $ii$. $15$ days after fertilization |
| $c$. Completion of implantation process | $iii$. By end of $4^{\text{th}}$ day after fertilization |
| $d$. Fully formed gastrula | $iv$. By end of $10^{\text{th}}$ day after fertilization |
Choose the correct option-
The gestation period of elephants is about
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View SolutionIn which of the following stages does the embryo consume the maximum amount of $O_2$?
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