The correct sequence in the process of development of human embryo is
- fertilization—zygote—cleavage—morula—blastula— gastrula
- fertilization—cleavage—morula—zygote—blastula—gastrula
- fertilization—zygote—blastula—morula—cleavage—gastrula
- cleavage—zygote—fertilization—morula—blastula—gastrula
The Correct Option is A
Solution and Explanation
Zygote - morula- blastula - gastrula - embryo
Zygote is the first cell that is formed after the fusion of sperm cells and the egg cell.
After multiple rounds of division through cleavage, it forms a solid ball called a morula. After that there is a formation of fluid filled hollow balls of cells called blastula. Gastrula have invagination and cell migration that results in the formation of three germ layers. The process of organogenesis forms embryos.
Top Questions on pregnancy
- Choose the statements which are correct with respect to the Medical Termination of Pregnancy (MTP) Act, 2017:
(A) Approximately \(20\%\) of the conceived pregnancies undergo MTP globally in a year
(B) MTP is legalized in India up to four months unconditionally
(C) Amniocentesis is mandatory before performing MTP
(D) MTPs are considered relatively safe up to 12 weeks of pregnancy
Choose the correct answer from the options given below:- CUET (UG) - 2024
- Biology
- pregnancy
Label the following layers around ovum properly.
- MHT CET - 2024
- Biology
- pregnancy
- Identify the terminal methods to prevent pregnancy.
Tubectomy
Vasectomy
IUDs
Cervical caps
Choose the correct answer from the options given below:- CUET (UG) - 2023
- Biology
- pregnancy
- Amniocentesis is a process to:
- KCET - 2022
- Biology
- pregnancy
- Which of the following secretes the hormone, relaxin, during the later phase of pregnancy ?
- NEET (UG) - 2021
- Biology
- pregnancy
Questions Asked in NEET exam
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is :
- NEET (UG) - 2025
- Moment Of Inertia
The current passing through the battery in the given circuit, is:
- NEET (UG) - 2025
- Current electricity
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :
- NEET (UG) - 2025
- Pendulums
- Two cities X and Y are connected by a regular bus service with a bus leaving in either direction every T min. A girl is driving scooty with a speed of 60 km/h in the direction X to Y. She notices that a bus goes past her every 30 minutes in the direction of her motion, and every 10 minutes in the opposite direction. Choose the correct option for the period T of the bus service and the speed (assumed constant) of the buses.
- NEET (UG) - 2025
- Relative Velocity
- The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at \(22.5^\circ\) from the polarization axis of one of the polaroids (\(I_0\) is the intensity of polarised light after passing through the first polaroid):
- NEET (UG) - 2025
- Polarization
Concepts Used:
Pregnancy
The human gestation period or pregnancy lasts for over nine months or 266 days. At times, childbirth also takes place prematurely or even after nine (9) months. The entire process of pregnancy is split into trimesters of three intervals:
- First Trimester: This comprises the period mainly from week one to twelve. This is the embryonic or pre-embryonic development stage.
- Second Trimester: This comprises the period from week thirteen to the twenty-fourth. This is the stage of fetal development and normally, most the body parts develop in this stage.
- Third Trimester: This comprises the period from week twenty-fifth to that of the birth of an infant. This stage spectates some of the major developments in the child such as the formation of the blood cells, bones turning hard, sense organs being developed and the fingernails are also visible by this stage.