Primary 5 · Science · Cycles: Human Reproduction
Cycles: Human Reproduction questions for Primary 5 Science
10 questions to work through online, 2 of them written out the way the paper asks. Answer and you get the working straight away, then a score at the end. No sign-up, and you can retake it as often as you like.
- Naming the first stage
- Where the baby develops
- What the cord does
- Protection before birth
- Ordering the stages
- Reading growth data
- Changes at puberty
- Naming the cord
- Naming the organ
- Reasoning about development
Same picture as the question above.
| Month of development | Length (cm) | Mass (g) |
|---|---|---|
| 3 | 8 | 30 |
| 5 | 25 | 300 |
| 7 | 38 | 1400 |
| 9 | 50 | 3300 |
Answers and explanations for all 10 questions
Every answer with the reasoning behind it. Worth reading after you have tried the set — or on its own, if you are a parent marking it.
What is the stage labelled W in the diagram above called?
Answer: fertilisation
Fertilisation is the joining of a sperm and an egg. Everything else in the diagram follows from it.
According to the diagram, where does the stage labelled Z take place?
Answer: in the womb
After the embryo settles at Y, the baby grows in the womb for about nine months until birth.
Which two of these pass along the umbilical cord to the developing baby?
Answer: A and B only
The cord carries the mother's blood supply to the baby, bringing oxygen and digested food and taking waste away. The baby's lungs and mouth are not used until birth.
What is the main job of the fluid that surrounds a baby in the womb?
Answer: to cushion the baby against knocks
The fluid acts as a shock absorber, spreading out any bump to the mother so the baby is protected.
Using the diagram above, which stage comes immediately after the fertilised cell divides many times?
Answer: Y
After dividing at X, the ball of cells travels to the womb and settles there, which is Y.
Based on the table above, which statement is correct?
Answer: The baby gains far more mass in the last four months than in the first five.
By month 5 the baby is 300 g; by month 9 it is 3300 g. Most of the mass is put on late, which is why the last months matter so much.
Which two of these are changes that happen to both boys and girls at puberty?
Answer: A and B only
A growth spurt and body hair happen to everyone at puberty. A deepening voice and the start of periods are changes in boys and girls respectively.
This cord joins the developing baby to the wall of the womb and carries everything the baby needs. What is it called? The ______ cord.
Answer: umbilical
The cord joining the baby to the womb is the umbilical cord.
This organ is where the baby develops during the nine months before birth. What is it called?
Answer: womb
The baby develops in the womb.
Why is a mother advised to eat well and avoid harmful substances while pregnant?
Answer: Whatever is in her blood can pass to the baby through the cord.
The baby is fed from the mother's blood through the umbilical cord, so what she takes in reaches the baby as well as herself.