First Two Weeks: Fertilisation to Implantation
- Previous year questions on First Two Weeks: Fertilisation to Implantation for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Anatomy section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 7 live questions in First Two Weeks: Fertilisation to Implantation.
- Anatomy is worth about 17 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 3 Sept 2026.
Q1.When does the Implantation occur?
- AOn day 4 after fertilization
- BAfter the endometrium undergoes a decidual reaction
- CWhen the embryo is at the morula stage
- DOnly after priming of the uterine endometrium by progesterone and estrogen✓ Correct answer
Q2.Extra-embryonic mesoderm is derived from:
- AEpiblast
- BPrimary yolk sac✓ Correct answer
- CSecondary yolk sac
- DHypoblast
Q3.Morula period is a ----- cell stage
- A4 to 8 cell stage
- B12 to 16 cell stage✓ Correct answer
- C28 to 32 cell stage
- D50 to 60 cell stage
Q4.Morula has how many cells
- A8
- B16✓ Correct answer
- C32
- D64
Q5.Zona Pellucida disappears by:-
- ABefore ferilisation
- BDuring feilization
- C5th day after feilization✓ Correct answer
- D7th day after feilization
Q6.Feilization is complete when
- A1st polar body is formed
- B2nd polar body is formed✓ Correct answer
- CPrimary oocyte is formed
- DSecondary oocyte is formed
Q7.Number of cells in a morula is ?
- A8
- B16✓ Correct answer
- C32
- DNone of the above
Answer key
Q1: D. Only after priming of the uterine endometrium by progesterone and estrogen; Q2: B. Primary yolk sac; Q3: B. 12 to 16 cell stage; Q4: B. 16; Q5: C. 5th day after feilization; Q6: B. 2nd polar body is formed; Q7: B. 16.
Other topics in Anatomy
- Gametogenesis
- Third to Eighth Week: Gastrulation and Organogenesis
- Placenta, Fetal Membranes and Multiple Pregnancy
- Development of Pharyngeal Arches, Bone and Muscle
- Development of the Heart, Vessels and Lungs
- Development of the Gut, Liver, Pancreas and Spleen
- Development of the Face, Palate, Eye and Ear
- Development of the Nervous System and Endocrine Glands
- Development of the Urogenital System
- The Cell, Epithelium, Glands and Connective Tissue
- Cartilage, Bone and Muscle Tissue
- Nerve Tissue and Endocrine Organs
- Microstructure of Vessels, Lymphoid Organs and Airways
- Microstructure of the Gut, Liver and Urogenital Tract
- Skin, Eye and Ear Microstructure
- Cranial Nerves
- Cranial Meninges and Venous Sinuses
- Ventricles, CSF and Subarachnoid Space
- Cerebrum
- White Matter Tracts and Internal Capsule
- Basal Ganglia and Limbic Structures
- Diencephalon
- Brainstem
- Cerebellum
- Blood Supply of the Brain
- Spinal Cord
- Skull Bones, Scalp and Face
- Cervical Fascia and Neck Triangles
- Muscles, Nerves and Vessels of the Head and Neck
- Salivary, Thyroid and Parathyroid Glands
- Oral Cavity: Tongue and Palate
- Pharynx
- Larynx
- Osteology and Articulations of the Upper Limb
- Axilla, Cubital Fossa and Related Spaces
- Breast
- Brachial Plexus and Upper Limb Nerves
- Upper Limb Musculature
- Arteries and Veins of the Upper Limb
- Chest Wall, Ribs and Intercostal Spaces
- Mediastinum
- Diaphragm
- Heart
- Lungs, Pleura and Bronchial Tree
- Anterior Abdominal Wall and Inguinal Region
- Peritoneum and the Peritoneal Cavity
- Stomach, Small and Large Intestine
- Liver, Biliary Tree, Pancreas and Spleen
- Abdominal Aorta and Visceral Arterial Supply
- Kidneys, Ureters, Bladder and Adrenal Glands
- Male and Female Genital Organs
- Pelvic Walls, Pelvic Floor and Perineum
- Lower Limb Osteology
- Hip, Knee and Ankle Joints
- Lower Limb Musculature
- Lumbosacral Nerves and Lower Limb Vessels
- Femoral Triangle, Popliteal Fossa and Foot Arches
- Vertebral Column
- Classification of Bones, Joints and Cartilage
- Muscle Types and Tendon Structure
- General Organisation of Vessels, Lymphatics and Nerves
- Skin, Fascia and Ligaments