2.2.1

Early Stages of Gestation

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Early Stages of Gestation

Gestation is the time that an unborn baby spends developing in the womb or uterus. The gestation period is called pregnancy in humans.

Early stages of gestation

Early stages of gestation

  • The average time for pregnancy (gestation period) in humans is 40 weeks.
  • Every human begins as 1 fertilised egg cell.
  • This cell divides into 2, then 4 and continues to divide into an embryo.
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1

Year 5: Living Things & Their Habitats

1.1

Asexual Reproduction

1.1.1Basics of Asexual Reproduction1.1.2Uses of Asexual Reproduction
1.2

Sexual Reproduction

1.2.1Basics of Sexual Reproduction1.2.2Reproductive Cells in Animals1.2.3Reproductive Cells in Plants
1.3

Fertilisation

1.3.1Fertilisation1.3.2Internal Fertilisation - Type 11.3.3Internal Fertilisation - Type 21.3.4Internal Fertilisation - Type 31.3.5External Fertilisation in Water
1.4

Reproduction in Plants

1.4.1Sexual Reproduction in Plants - Male1.4.2Sexual Reproduction in Plants - Female1.4.3Pollination
1.5

Life Cycles in Plants

1.5.1Seeds & Germination1.5.2Growth & Pollination
1.6

Life Cycles in Mammals

1.6.1Gestation & Young Mammals1.6.2Adult Mammals
1.7

Life Cycles in Amphibians

1.7.1Birth & Young Amphibians1.7.2Adult Amphibians
1.8

Life Cycles in Birds

1.8.1Birds' Eggs1.8.2Young & Adult Birds
1.9

Life Cycles in Insects

1.9.1Eggs & Larva1.9.2Pupa & Adults
1.10

Understanding the Natural World

1.10.1Animal Behaviourists1.10.2Naturalists
2

Year 5: Animals (Including Humans)

2.1

Humans Life Cycles

2.1.1Fertilisation & Early Development in Humans2.1.2Adolescence & Adult Humans
2.2

Gestation

2.2.1Early Stages of Gestation2.2.2The Umbilical Cord2.2.3Foetus & Birth2.2.4Comparing Gestation of Animals
3

Year 5: Properties & Changes of Materials

3.1

Properties of Materials

3.1.1Materials3.1.2Hardness, Solubility, Transparency3.1.3Conductors & Magnetic3.1.4Metals & Wood3.1.5Plastic
3.2

Separating Mixtures

3.2.1Salt Separation3.2.2Separating Solids from Liquids3.2.3Physical Changes3.2.4Chemical Changes
3.3

Experiments

3.3.1Conducting Experiments
4

Year 5: Earth & Space

4.1

How Do We Have Night & Day?

4.1.1The Sun & the Moon4.1.2Earth and Other Planets4.1.3The Solar System4.1.4Planet Features4.1.5Day & Night4.1.6Moons of the Solar System
5

Year 5: Forces

5.1

Forces

5.1.1What are Forces?5.1.2What do Forces Do?
5.2

Forces that Move Objects

5.2.1Friction5.2.2Air Resistance5.2.3Reducing Air Resistance5.2.4Water Resistance5.2.5Reducing Water Resistance5.2.6The Discovery of Gravity5.2.7The Force of Gravity5.2.8Gravity & Other Forces
5.3

Gears, Levers & Pulleys

5.3.1Gears5.3.2Levers5.3.3Pulleys
6

Year 6: Living Things & Their Habitats

6.1

Classification of Living Things

6.1.1Classification of Living Things6.1.2The Animal Kingdom6.1.3Vertebrates & Invertebrates6.1.4Fish, Amphibians, Reptiles6.1.5Birds & Mammals6.1.6Arthropods, Molluscs, Annelids6.1.7The Plant Kingdom6.1.8Groups of Plants6.1.9Microorganisms & Viruses6.1.10Using Keys to Classify Living Things
7

Year 6: Animals (Including Humans)

7.1

The Circulatory System

7.1.1Blood Cells7.1.2Substances Transported in the Blood7.1.3Blood Vessels7.1.4Pulmonary Artery & Pulmonary Vein7.1.5The Heart7.1.6Chambers of the Heart
8

Year 6: Evolution & Inheritance

8.1

Evolution

8.1.1Adaptation to Cold Areas8.1.2Adaptation to Hot Areas8.1.3Variation in Humans8.1.4Variation in Dogs8.1.5Evolution & Mutations8.1.6Examples of Evolution8.1.7Fossils8.1.8Natural Selection8.1.9Darwin & Wallace
9

Year 6: Light

9.1

How Do We See?

9.1.1Light9.1.2Light & Shadows9.1.3Reflection9.1.4Periscopes
10

Year 6: Electricity

10.1

What is Electricity?

10.1.1Electricity, Current & Voltage10.1.2Electrical Symbols10.1.3Circuit Diagrams: Lamp10.1.4Circuit Diagrams: Buzzer10.1.5Electrical Safety
11

Year 5 & 6: Working Scientifically

11.1

Thinking Scientifically

11.1.1Scientific Questions11.1.2Ideas & Evidence11.1.3Punished Scientists:Galileo Galilei11.1.4Evidence is Not Proof11.1.5Hypothesis11.1.6Theory
11.2

Scientific Enquiry

11.2.1Starting an Enquiry11.2.2Observations & Testing11.2.3Research11.2.4Data Patterns11.2.5Correlations11.2.6Sorting & Classifying11.2.7Tools for Sorting & Classifying11.2.8Variables
11.3

Planning an Investigation

11.3.1Planning an Investigation: Question11.3.2Planning an Investigation: Equipment11.3.3Planning an Investigation: Equipment (2)11.3.4Planning an Investigation: Measurement
11.4

Carrying Out an Investigation

11.4.1Health & Safety11.4.2Using Equipment Correctly11.4.3Observing, Measuring & Recording11.4.4Replication & Annomalies11.4.5Recording & Presenting Information
11.5

Writing Up an Investigation

11.5.1Writing Up an Investigation11.5.2Presenting Data11.5.3Diagrams & Images
11.6

Conclusions & Discussions

11.6.1Writing a Conclusion11.6.2Finalising Your Conclusion

Practice questions on Early Stages of Gestation

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    What is the name of the time that an unborn baby spends developing in the womb or uterus?Multiple choice
  2. 2
    Every human begins as one fertilised egg cell. What process enables the change to two cells, four cells and then a whole embryo?Multiple choice
  3. 3
    What is the gestation period called in humans?Multiple choice
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Adolescence & Adult Humans

The Umbilical Cord