Female Reproductive Process — NEET Biology
📚 Practice ConceptThe process of release of ovum from a mature follicle is called (g) Ovulation is induced by a hormone called (h) The fusion of male and female gametes is called (i) Fertilisation takes place in (j) Zygote divides to form which is implanted in uterus. (k) The structure which provides vascular connection between foetus and uterus is called
Which of the following statements regarding early human embryonic development and implantation are correct? S1: The fusion of male and female gametes, known as fertilisation, predominantly occurs in the ampullary region of the oviduct, followed by the initiation of mitotic divisions (cleavage) as the zygote moves towards the uterus. S2: The blastocyst, formed by repeated divisions of the zygote, comprises an outer layer called trophoblast and an inner group of cells known as the inner cell mass; the inner cell mass is responsible for direct attachment to the uterine endometrium during implantation. S3: The endometrium, the inner glandular layer of the uterus, is essential for the implantation of the blastocyst and undergoes cyclical changes under hormonal influence to support pregnancy. S4: Following implantation, finger-like projections called chorionic villi develop from the trophoblast, which, along with uterine tissue, form the structural and functional unit of the placenta, acting as an endocrine tissue. S5: The determination of the embryo's sex is exclusively controlled by the type of sex chromosome (X or Y) carried by the ovum that successfully fertilises the sperm. S6: The inner cell mass, post-implantation, differentiates to form the ectoderm and endoderm initially, with the mesoderm appearing later between them, collectively giving rise to all tissues and organs.
View solution & NCERT explanation
Correct answer: B — S1, S3, S4 and S6 are correct.
Let's evaluate each statement: S1: Fertilisation takes place in the ampullary region of the fallopian tube. After fertilisation, the zygote undergoes mitotic divisions, called cleavage, as it moves through the isthmus towards the uterus. This statement is correct. S2: The blastocyst consists of an outer layer called trophoblast and an inner group of cells, the inner cell mass. The trophoblast layer, not the inner cell mass, gets attached to the endometrium during implantation. Therefore, this statement is incorrect. S3: The endometrium is the inner glandular layer of the uterus. It undergoes cyclical changes during the menstrual cycle and is the site where the blastocyst becomes embedded (implantation). It is essential for supporting pregnancy. This statement is correct. S4: After implantation, chorionic villi, which are finger-like projections, appear on the trophoblast. These villi and the uterine tissue interdigitate to form the placenta. The placenta also functions as an endocrine tissue, producing various hormones necessary for pregnancy. This statement is correct. S5: The sex of the baby is determined by the sperm. If an X-carrying sperm fertilises the ovum, the zygote will be XX (female); if a Y-carrying sperm fertilises the ovum, the zygote will be XY (male). The ovum always carries an X chromosome. Therefore, this statement is incorrect as it attributes sex determination control to the ovum's chromosome type. S6: Immediately after implantation, the inner cell mass differentiates into an outer ectoderm and an inner endoderm. A mesoderm soon appears between them. These three germ layers give rise to all the tissues and organs in the adult. This statement is correct. Based on the analysis, statements S1, S3, S4, and S6 are correct. The final answer is $\text{B}$.
What does NCERT say about process release ovum from?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.