NATURAL SCIENCES. TEST UNIT 4. ANIMAL REPRODUCTION

Aristotle stated that flies and mosquitoes were produced spontaneously from mud and from rubbish.

In the 18th century, Pasteur showed that the theory of spontaneous generation was false.

Pasteur used a serious of experiments to prove that microbes in the air can contaminate any material that is near them

In a hermaphrodite animal, the same individual produces eggs and sperm.

Hermaphroditism is common in earthworms

Most mammals only reproduce at a certain time of the year. This is when the male reaches maximum sexual receptivity and is most attractive to the male.

In humans, fertilisation can take place at any time of year

Polyembryony is a type of sexual reproduction in which an embryo fragments into several different embryos

Polyembryony is a characteristic of certain vertebrates like armadillos

In humans, polyembryony is seen in identical twins