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Commom misconceptions in Biology (covers all topics)
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Why does the corpus luteum
need to be maintained for the
first 16 weeks of pregnancy?
Why does the corpus luteum
need to be maintained for the
first 16 weeks of pregnancy?
It secretes progesterone that
maintains the endometrium,
which contributes to the
structure of the placenta.
What hormones does the
placenta secrete?
What hormones does the
placenta secrete?
hCG (originally secreted by the
blastocyst following
implantation), progesterone and
oestrogen.
Explain the important functions
of the tapetum, the layer of cells
that surrounds the pollen sacs.
Explain the important functions
of the tapetum, the layer of cells
that surrounds the pollen sacs.
1. Provide nutrients and
regulatory molecules to the
developing pollen grains.
2. Has a role in the development of the
pollen cell wall.
3. Resists desiccation.
4. Prevents UV light from entering the pollen sac.
Self pollination leads to...
Self pollination leads to...
Self fertilisation, which results in
inbreeding.
What is dichogamy?
What is dichogamy?
When the stamens and stigmas ripen at different times to ensure cross pollination. There are two types: PROTANDRY, where the stamens ripen first, and PROTOGYNY, where the stigmas
ripen first.
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