Reproduction

Male reproductive cells are called _____

Sperm are _______ than female sex cells and can ____.

Sperm ___ have a food store

Female reproductive cells are called ___ cells

Eggs are ______ than sperm and _____ move by themselves.

Eggs ____ a food store

Fertilisation takes place when one male _____ fuses with one female _____. A fertilised ___ is produced.

For fertilisation to occur the sperm must be able to _____ the egg

In fish the females lay their ____ in the water and the males deposit their ____ sperm next to the eggs. This is known as _______ fertilisation because it takes place _______ the female's body.

________ fertilisation takes place inside the female's body, therefore the sperm must be _____ inside the female's body.

Internal fertilistion is important to land-living animals because there is no ______ environment into which eggs and sperm can be released.

In animals that use internal fertilisation, the male produces a liquid containing sperm which is ________ inside the female's body during ______

Sperm are produced in _____

During mating the sperm pass along the _____ ____ to the penis, which deposits the sperm inside the female's body.

Eggs are produced in the ____ and are released into the ______.

The embryo develops in the _____

Sperm enter the female's body via the ______

After fertilisation the fertilised egg develops into an ______

In fish the fertilisation egg is protected by a _____ _______ and the embryo obtains its food from the enclosed ___

In mammals fertilisation occurs in the ______

The fertilisated egg passes down the oviduct to the uterus where it becomes attached to the ____ of the ______.

As the embryo continues to develop, a fluid-filled bag called the ______ ___ protects it.

The embryo receives nutrients from its mother's _____

Blood coming from the embryo to the placenta carried waste substances like _______. These waste substances pass into the mother's _____ and are carried away.

Oxygen and digested food pass into the embryo's blood from the mother's blood in the ________

In fish, the young are born with a ____ ___ attached, which they use for food until they can find their own. They _____ receive any parental support.

When young mammals are born, they are ________ on their parents at first for care and protection. Their mothers provide them with ____

The ______ the degree of care and protection provided by parents, the _____ eggs and young need to be produced.

In animals like fish, parents provide very _____ care or protection during the processes of fertilisation and development.

Fish must produce ____ eggs to ensure that enough are fertilised and that enough young survive to keep the species from becoming ______

In mammals parents provide ____ care and protection, so _____ eggs and young need to be produced.