C
CraftExam
medium difficulty4 min

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.

In one line: Implant in uterus; exchange through placenta.

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Understand it

  • 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.

Rule to remember

Fertilisation forms zygote; zygote divides into embryo; embryo implants in uterus; placenta supports exchange.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

If a question asks why the uterus has a thick lining, explain that it supports implantation and nourishment of the developing embryo.

Method you can reuse

Write the sequence: fertilisation in oviduct, zygote division, movement to uterus, implantation, placenta formation, development.

Visual tip

A simple flow diagram can show zygote, embryo, implantation, placenta, and foetus development.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

What is implantation in human reproduction?

Think first, then show answer
Implantation is the attachment of the early embryo to the lining of the uterus, where further development can take place.

Common wrong answer

Writing that implantation occurs in the ovary.

Why it loses marks: Implantation occurs in the uterine lining.

Don't mix this up

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.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Questions ask the role of placenta, meaning of implantation, and basic sequence from fertilisation to development.
  1. 1

    Enough for 1 mark

    Pregnancy is the period during which the embryo develops in the uterus after implantation, supported by the placenta and the mother's body.

  2. 2

    Add for 2 marks

    Example: The placenta supplies nutrients and oxygen to the developing embryo and helps remove wastes from it.

  3. 3

    Add for 3 marks

    After fertilisation, the zygote divides to form an embryo.

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