Biology Unit 4 - THINGS I KEEP FORGETTING 0.0 / 5 ? BiologyOtherA2/A-levelWJEC Created by: Tashaleese_99Created on: 23-05-17 12:05 Function of the ovaries (generalised)? Produce oocytes for fertilisation and secrete the hormones oestrogen and progesterone. 1 of 15 How long is the foetus at the end of the first trimester? 5cm. 2 of 15 Major events of the 2nd trimester? The foetus begins to store fat, move and so may open their eyes. They are 30cm long by week 28. 3 of 15 What are the inter-villous spaces between the chorionic villi of the placenta called? Lacunae. 4 of 15 Which part of a blastocyst eventually forms the chorion? Trophoblast cells. 5 of 15 How does the placenta provide protection from the mother's immune response? The walls of the chorionic villi fuse so that immune cells cannot pass into the foetal circulation. 6 of 15 The amnion is a membrane derived from... The inner cell mass of a blastocyst. 7 of 15 Why is outbreeding of evolutionary significance? Some genomes are more successful than others, so it may allow a species to survive in a changing environment. 8 of 15 What is it called when a stamen and stigma ripen at different times of the year? Dichogamy. 9 of 15 If the stamen ripens first, this is called... PROTANDRY. 10 of 15 If the stigma ripens first (rare), this is called... PROTOGYNY. 11 of 15 From what structure does the fruit develop? OVARY (not ovary wall). 12 of 15 From what structure does the seed develop? Fertilised ovule. 13 of 15 Germination The biochemical and physiological processes through which a seed becomes a photosynthesising plant. 14 of 15 What process is gibberellin involved in? Germination in endospermic seeds (brings the seed out of dormancy). 15 of 15
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