AIPMT MAINS 2012 Zoology Embryonic Development MCQ Question

1. Zygote (Fertilization to 2 weeks): This is the initial stage when sperm fertilizes the egg. It occurs in the fallopian tube.

2. Embryo (2 weeks to 8 weeks): This stage begins after implantation in the uterus. The embryo undergoes significant development, including the formation of major organs and structures.

3. Fetus (8 weeks to birth): After the embryonic period, the developing organism is referred to as a fetus. This stage involves growth and maturation of the organs and systems.

4. Neonate (Birth to 1 month): This stage refers to the newborn period, which occurs outside the womb.

Given that the correct answer is C, we can conclude that this corresponds to the Fetus stage (8 weeks to birth) and the right place of its occurrence is the uterus.

Explanation of the Correct Answer (C):

• Stage Identification: The fetal stage is characterized by the development of recognizable human features and continued growth of the organs that were formed during the embryonic stage. By week 8, the embryo is fully formed and has transitioned into a fetus.
• Location: The uterus is where the fetus develops throughout the remainder of the pregnancy until birth.

Clarification of Incorrect Options:

• Option A (1): This corresponds to the Zygote stage. This stage occurs in the fallopian tube, not the uterus, making it incorrect when identifying the fetal development stage.

• Option B (2): This refers to the Embryo stage. While it does occur in the uterus, it does not represent the fetal stage, which is specifically what the question asks for.

• Option D (4): This represents the Neonate stage, which occurs after birth. Since the question specifies a stage of development during pregnancy, this option is not applicable.

Summary:

The correct answer is C because it accurately identifies the Fetus stage of development (8 weeks to birth) occurring within the uterus. Each incorrect option references either an earlier stage of embryonic development that does not pertain to the question or a stage that occurs after birth.

In the context of human reproduction and embryonic development, understanding these stages is crucial for comprehending how human life begins and progresses in a normal pregnancy.