16. Reproduction
A section of Biology, 0610
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shows seven marsupial mammals. A B C D E F G not drawn to scale State one visible feature that could be used to identify the marsupials in as mammals. Use the key to identify each species. Write the letter of each species (A to G) in the correct box beside the key. One has been done for you. key 1 tail visible go to 2 no tail visible go to 3 2 back feet at least twice as long as front feet go to 4 back feet and front feet of similar length go to 5 3 large ears relative to the size of the head Phascolarctos cinereus small ears relative to the size of the head Vombatus ursinus 4 tail at least twice as long as body Sminthopsis longicaudata tail less than twice as long as body Macropus rufus 5 uniform body colouring Paljara tirarense markings on body go to 6 6 white band across back and chest Sarcophilus harrisii no white band across back and chest Dasyurus maculatus G Sexual reproduction occurs in all mammals. A zygote is formed from the fertilisation of a male gamete and a female gamete. Name the process that results in the formation of haploid gametes. Explain the importance of sexual reproduction in mammals. Marsupials differ from other mammals by giving birth to relatively undeveloped offspring. Female humans have a placenta and therefore give birth to more developed offspring. Describe the role of the placenta in humans. In humans, the placenta is connected to the amniotic sac which contains amniotic fluid. State two functions of the amniotic fluid.
0610_w15_qp_33
THEORY
2015
Paper 3, Variant 3
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