Select the option that correctly fills up the blanks in the given paragraph.
After one month of pregnancy, the embryo's (i) is formed. By the end of the (ii) month of pregnancy, the foetus develops limbs and digits. By the end of (iii), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed. By the end of (iv), the body is covered with fine hair, eyelids separate, and eyelashes are formed.
Important Questions on Human Reproduction
Write the differences between blastula and morula.
Reason (R): Placenta of man is described as haemo endothelial placenta
Match the following columns and select the correct option:-
| Column-I | Column-II | ||
| (a) | Ovary | (i) | Human chorionic gonadotropin |
| (b) | Placenta | (ii) | Estrogen & Progesterone |
| (c) | Corpus luteum | (iii) | Androgens |
| (d) | Leydig cells | (iv) | Progesterone only |
Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Endometrium is necessary for implantation of blastocyst.
Reason R: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements, choose the correct answer from the options given below:
