Pregnancy and Development
Pregnancy is the period during which the embryo develops in the uterus after implantation, supported by the placenta and the mother's body.
Practice This ConceptMain explanation
Teacher explanation
After fertilisation, the zygote divides to form an embryo. The embryo implants in the uterine lining. The placenta helps exchange nutrients, oxygen, and wastes between mother and developing baby without mixing their blood directly. In humans, the gestation period is about nine months.
Example
The placenta supplies nutrients and oxygen to the developing embryo and helps remove wastes from it.
Simple analogy
Implant in uterus; exchange through placenta.
Common confusion
Students often write that the placenta is the baby’s stomach; it is an exchange organ between mother and developing baby.
Exam tip
For placenta questions, mention nutrients, oxygen, waste removal, and connection through the umbilical cord.
Answer writing and exam use
1-mark use
Write the exact meaning of pregnancy and development in one clean line.
2-mark use
Define pregnancy and development and add one example or condition.
3-mark use
Explain pregnancy and development, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.
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