- What is the single-cell structure formed after fertilisation?
Answer: Zygote
A zygote is formed when the sperm and egg fuse; it is the first stage of a new organism’s life.
- What does the zygote develop into after repeated division?
Answer: Embryo
The zygote divides repeatedly and becomes a ball of cells which then forms an embryo, the early stage of development.
- Where in the female body does the embryo get embedded?
Answer: Uterus
The embryo gets embedded in the wall of the uterus, where it continues to develop further.
- What is the stage of development called when body parts become visible?
Answer: Foetus
An embryo becomes a foetus when all the body parts such as eyes, limbs, and head are visible and identifiable.
- What forms first when the zygote divides repeatedly?
Answer: Ball
The zygote forms a ball of cells in the early stage of embryo development, before differentiating into tissues.
- What does the ball of cells develop into?
Answer: Tissues
The cells in the ball start forming groups that later develop into various tissues and organs of the body.
- Which animals develop embryos inside egg shells?
Answer: Hen
In hens, the embryo develops inside a hard egg shell, and hatches after about three weeks.
- Which animals develop embryos inside their bodies?
Answer: Humans
In humans, the embryo grows inside the uterus and develops into a baby before birth.
- What protects frog eggs during external development?
Answer: Jelly
Frog eggs are held together by a layer of jelly, which provides protection in external development.
- What process transforms an embryo into a chick in birds?
Answer: Incubation
The hen provides warmth to the egg during incubation, allowing the embryo to develop into a chick.
