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प्रश्न
The diagram given below represents a specific stage of human embryonic development. Identify the stage.
उत्तर
Morula
APPEARS IN
संबंधित प्रश्न
(a) Arrange the following hormones in sequence of their secretion in a pregnant woman.
(b) Mention their source and the function they perform :
hcG, LH, FSH, Relaxin
Eye lens is formed from ______.
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?
Relaxin is the hormone secreted by the placenta.
Mark the odd one.
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
At which stage of embryonic development does trophectoderm develop?
The secondary sexual characters develop in females because:
Extra-embryonic membranes provide:
Match the columns I and II with reference to weeks of pregnancy and the development of a human embryo. Select the correct option from the choices given below:
| Column I | Column II | ||
| I. | 8 weeks | (P) | Limbs and external genital organs |
| II. | 12 weeks | (Q) | Limbs and digits develop. |
| III. | 20 weeks | (R) | Body hair develops. |
| IV. | 24 weeks | (S) | Eyelids separate. |
The diagram given below shows the early embryonic stages of fish, reptiles, birds and humans. Though adult reptiles, birds and mammals breathe air, their embryos possess gills. How does this fact support evolution?
