Use the Mouse Pointer to Select the Words to Fill in the Blanks

Use the mouse pointer to select the words to fill in the blanks.

During season malemost impressivefemale stickleback fish build a nest of waterweeds and develop red bellies to attract a femalelot of unwanted attentionmaleAberdeen fans. The two fish perform unadviseabledirty dancingworryingacrobaticthe tangocourtship movements. Finally the malefemalesalmon with identity issues lays eggs in the nest and swims away and the malefemale deposits his sperm in the water adjacent to the eggs.

During copulationthe christmas holidayscourting the ABCDE receives an extra supply of blood so that sperm can be deposited into the vagina. The sperm are made in ABCDEseminal fluid is added to the sperm at point ABCDE. The testes are contained in ABCDEin order tobe kept coolerbe kept warmer . Muscles in the sperm duct force millionshundreds of sperm into the upper end of the vagina point FGHI.

The sperm enter the vagina at point FGHIand travel through the cervix at pointFGHIwhich is a muscular ringduct at the base of the womb. The sperm swim up through the M6Uterusat point FGHI and into the oviduct at FGHI. If an egg has been released from thepoliceovaryoff the back of a lorryat pointFGHIsperm will meet the egg at point FGHI. This is where fertilisation takes place.

Now answer these short questions on keywords:

1. The fertilized egg is now called azygoteembryofoetus.
2. This becomes an foetusembryozygotewhile being transported along the oviduct.
3. The embryoovumpasses to the uterus and becomes embedded in the uterine wall.
4. This is called embeddingimplantation.
5. The period of development is called gestationpregnancy
6. The amnionumbilical cordplacenta is the organ which allows the foetus and mother’s blood supply to become in close contact.

Fish produce an enormous amount of eggs!

–EXTERNALINTERNAL fertilisation is moreless efficient and moreless wasteful.

–The chance of sperm meeting an egg are greaterless.

–Fertilised eggs receive no protection.

Mammals produce less eggs!

–INTERNALEXTERNAL fertilization is lessmore efficient and lessmore wasteful.

–LessGreater chance of fertilisation.

–Fertilised eggs are well protected inside the female’s body.

Select ONE statement that is True : -

Fish therefore produce more eggs to ensure that a sufficient number are fertilised and survive to maintain the species!

Fish therefore produce more eggs to ensure that massive numbers are fertilised and survive to increase the population every season!

NOW TRY THESE LINKS to on-line TESTS : -

- see esp No. 18 19 22 & 23

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