Fertilisation, embryo development to blastocyst, implantation
- Given below are two 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 ca… Answer: 3. Both A and R are true but R is NOT the correct explanation of A. Key idea: Both statements are true, but they are unrelated. A is... 1
- Receptors for sperm binding in mammals are present on : Answer: 4. Zona pellucida In mammals, sperm-binding receptors are present on the zona pellucida, the glycoprotein layer around the ovum. Bin... 1
- Meiotic division of the secondary oocyte is completed : Answer: 4. At the time of fusion of a sperm with an ovum Key idea: The secondary oocyte is arrested in metaphase II and completes meiosis II... 1
- The amnion of mammalian embryo is derived from Answer: 1. ectoderm and mesoderm Key idea: The extra-embryonic membranes are formed from the germ layers. The amnion is made of extra-embryo... 1
- Capacitation occurs in : Answer: 3. Female Reproductive tract Key idea: Freshly ejaculated sperm cannot fertilise an ovum yet. They must spend some time in the secre... 1
- Fertilization in humans is practically feasible only if : Answer: 2. the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the fallopian tube. Key idea: Fertilization... 1