Termination of gastrulation is indicated by:
Correct answer: A. Obliteration of blastocoel
- A. Obliteration of blastocoel
- B. Obliteration of archenteron
- C. Closure of blastopore
- D. Closure of neural tube
Explanation
During gastrulation, the blastula undergoes significant changes to form the three germ layers: ectoderm, mesoderm, and endoderm. As these layers form, the blastocoel, which is the fluid-filled cavity of the blastula, becomes gradually reduced in size and is eventually filled in by the newly formed cells. The obliteration of the blastocoel signifies the completion of gastrulation and the establishment of the germ layers.
Last updated
About Reproduction
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
Practise Reproduction
1,220 free Reproduction MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
2nd meiotic division in the oocyte is completed during the?
50 secondary oocytes in females and 50 secondary spermatocytes in males give rise to:
50 secondary spermatocytes and 50 secondary oocytes will give rise to
A carpel is a leaf which has been modified to produce:
A change in the amount of yolk and its distribution in the egg will affect: