[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:03.37,Default,,0000,0000,0000,,[MUSIC PLAYING]
Dialogue: 0,0:00:09.62,0:00:11.60,Default,,0000,0000,0000,,For this flower dissection,\Nwe're using a lily
Dialogue: 0,0:00:11.60,0:00:14.57,Default,,0000,0000,0000,,because it's a really large flower\Nthat's got really obvious and very
Dialogue: 0,0:00:14.57,0:00:15.80,Default,,0000,0000,0000,,distinct reproductive parts.
Dialogue: 0,0:00:18.31,0:00:20.06,Default,,0000,0000,0000,,Now the first thing\Nthat we're going to do
Dialogue: 0,0:00:20.06,0:00:22.19,Default,,0000,0000,0000,,is remove this outer layer here.
Dialogue: 0,0:00:22.19,0:00:24.64,Default,,0000,0000,0000,,These are the parts\Nknown as the sepals.
Dialogue: 0,0:00:24.64,0:00:26.60,Default,,0000,0000,0000,,And you can see there,\Nthey are the first thing
Dialogue: 0,0:00:26.60,0:00:29.58,Default,,0000,0000,0000,,that comes out at the top\Nof the stem of the flower.
Dialogue: 0,0:00:29.58,0:00:32.82,Default,,0000,0000,0000,,[MUSIC PLAYING]
Dialogue: 0,0:00:34.78,0:00:36.78,Default,,0000,0000,0000,,We can see here on\Nthis diagram, there
Dialogue: 0,0:00:36.78,0:00:38.41,Default,,0000,0000,0000,,is the stem, the\Nreceptacle at the top.
Dialogue: 0,0:00:38.41,0:00:41.29,Default,,0000,0000,0000,,And the sepals are sticking out\Neither side, and they're in green.
Dialogue: 0,0:00:41.29,0:00:43.25,Default,,0000,0000,0000,,The petals are above\Nthem, and they're brightly
Dialogue: 0,0:00:43.25,0:00:44.74,Default,,0000,0000,0000,,colored to attract insects.
Dialogue: 0,0:00:44.74,0:00:48.55,Default,,0000,0000,0000,,Here you can see the sepals are\Ngreen on the bud of the flower.
Dialogue: 0,0:00:48.55,0:00:51.01,Default,,0000,0000,0000,,But in the earlier stages\Nof it starting to bloom,
Dialogue: 0,0:00:51.01,0:00:53.14,Default,,0000,0000,0000,,they are the same\Ncolor as the petals.
Dialogue: 0,0:00:53.14,0:00:56.11,Default,,0000,0000,0000,,So in this particular species,\Nthe petals and the sepals
Dialogue: 0,0:00:56.11,0:00:59.33,Default,,0000,0000,0000,,look almost identical.
Dialogue: 0,0:00:59.33,0:01:01.33,Default,,0000,0000,0000,,Now that we've removed\Na few sepals and petals,
Dialogue: 0,0:01:01.33,0:01:04.70,Default,,0000,0000,0000,,we can see much more clearly what's\Non the inside of this flower.
Dialogue: 0,0:01:04.70,0:01:06.34,Default,,0000,0000,0000,,And you can see on\Nthis one that we've
Dialogue: 0,0:01:06.34,0:01:08.92,Default,,0000,0000,0000,,got both the male and the\Nfemale reproductive parts,
Dialogue: 0,0:01:08.92,0:01:10.42,Default,,0000,0000,0000,,which have been produced at once.
Dialogue: 0,0:01:10.42,0:01:11.96,Default,,0000,0000,0000,,At the base of the\Npetals here, we've
Dialogue: 0,0:01:11.96,0:01:15.43,Default,,0000,0000,0000,,got this sticky sugar-containing\Nfluid, and this is known as nectar.
Dialogue: 0,0:01:15.43,0:01:17.77,Default,,0000,0000,0000,,And it's there to\Nattract insects, which
Dialogue: 0,0:01:17.77,0:01:19.48,Default,,0000,0000,0000,,are necessary for pollination.
Dialogue: 0,0:01:22.90,0:01:25.75,Default,,0000,0000,0000,,Let's take a closer look now\Nat the male reproductive part
Dialogue: 0,0:01:25.75,0:01:26.35,Default,,0000,0000,0000,,of the flower.
Dialogue: 0,0:01:26.35,0:01:28.54,Default,,0000,0000,0000,,This part is known as the stamen.
Dialogue: 0,0:01:28.54,0:01:32.71,Default,,0000,0000,0000,,And the stamen contains the anther,\Nsupported by a stringy thing called
Dialogue: 0,0:01:32.71,0:01:34.61,Default,,0000,0000,0000,,the filament.
Dialogue: 0,0:01:34.61,0:01:36.79,Default,,0000,0000,0000,,The job of the anthers\Nis to produce pollen.
Dialogue: 0,0:01:36.79,0:01:40.03,Default,,0000,0000,0000,,The anthers produce the\Nmale gametes of the flower.
Dialogue: 0,0:01:40.03,0:01:43.00,Default,,0000,0000,0000,,In the earlier stages of\Nblooming of the flower,
Dialogue: 0,0:01:43.00,0:01:45.94,Default,,0000,0000,0000,,you can see the pollen starting\Nto burst out of the anthers.
Dialogue: 0,0:01:45.94,0:01:48.58,Default,,0000,0000,0000,,But once the flower's\Nmore mature, they're
Dialogue: 0,0:01:48.58,0:01:51.55,Default,,0000,0000,0000,,a lot more exposed and readily\Nreleased from the anthers.
Dialogue: 0,0:01:51.55,0:01:55.21,Default,,0000,0000,0000,,And you can see these coming\Noff here as a sort of dust.
Dialogue: 0,0:01:55.21,0:01:57.34,Default,,0000,0000,0000,,We can put this onto\Na microscope slide,
Dialogue: 0,0:01:57.34,0:02:01.00,Default,,0000,0000,0000,,and then put it under the lens to\Nhave a little closer look at it.
Dialogue: 0,0:02:01.00,0:02:03.82,Default,,0000,0000,0000,,And you'll be able to see the\Nindividual pollen grains that have
Dialogue: 0,0:02:03.82,0:02:05.11,Default,,0000,0000,0000,,been released from the anthers.
Dialogue: 0,0:02:08.69,0:02:11.54,Default,,0000,0000,0000,,Next, let's have a look at\Nthe female reproductive part
Dialogue: 0,0:02:11.54,0:02:12.38,Default,,0000,0000,0000,,of the flower.
Dialogue: 0,0:02:12.38,0:02:13.98,Default,,0000,0000,0000,,At the bottom here is the ovary.
Dialogue: 0,0:02:13.98,0:02:16.19,Default,,0000,0000,0000,,This is the slightly large,\Ninflated part, which will
Dialogue: 0,0:02:16.19,0:02:18.11,Default,,0000,0000,0000,,go on to develop into the fruit.
Dialogue: 0,0:02:18.11,0:02:19.68,Default,,0000,0000,0000,,Above that is the style.
Dialogue: 0,0:02:19.68,0:02:22.13,Default,,0000,0000,0000,,And at the top of the\Nstyle here is the stigma.
Dialogue: 0,0:02:22.13,0:02:24.00,Default,,0000,0000,0000,,And this is where\Nthe pollen must land.
Dialogue: 0,0:02:26.51,0:02:30.52,Default,,0000,0000,0000,,In the diagram here, you can see the\Ncarpel with the ovary at the bottom
Dialogue: 0,0:02:30.52,0:02:32.40,Default,,0000,0000,0000,,and the style above it\Nand the stigma on top.
Dialogue: 0,0:02:32.40,0:02:34.04,Default,,0000,0000,0000,,This is the female\Npart of the flower.
Dialogue: 0,0:02:34.04,0:02:36.92,Default,,0000,0000,0000,,And inside of the\Novary are the ovules.
Dialogue: 0,0:02:36.92,0:02:40.55,Default,,0000,0000,0000,,Here we've got the female gametes.
Dialogue: 0,0:02:40.55,0:02:42.64,Default,,0000,0000,0000,,We can now cut into\Nthe ovary so that we
Dialogue: 0,0:02:42.64,0:02:44.51,Default,,0000,0000,0000,,can get a little bit of\Na closer look of what
Dialogue: 0,0:02:44.51,0:02:45.76,Default,,0000,0000,0000,,this looks like on the inside.
Dialogue: 0,0:02:45.76,0:02:48.81,Default,,0000,0000,0000,,[MUSIC PLAYING]
Dialogue: 0,0:02:57.38,0:02:58.63,Default,,0000,0000,0000,,We've cut off the outer layer.
Dialogue: 0,0:02:58.63,0:03:00.31,Default,,0000,0000,0000,,And now we'll cut off\Na little section of it
Dialogue: 0,0:03:00.31,0:03:01.73,Default,,0000,0000,0000,,so that we can have a closer look.
Dialogue: 0,0:03:01.73,0:03:05.12,Default,,0000,0000,0000,,[MUSIC PLAYING]
Dialogue: 0,0:03:14.55,0:03:16.11,Default,,0000,0000,0000,,On the inside of\Nthe ovary, we've got
Dialogue: 0,0:03:16.11,0:03:19.59,Default,,0000,0000,0000,,lots and lots and lots of these\Nabsolutely tiny, little ovules.
Dialogue: 0,0:03:19.59,0:03:21.69,Default,,0000,0000,0000,,We really need to see\Nthem under a microscope
Dialogue: 0,0:03:21.69,0:03:22.86,Default,,0000,0000,0000,,to get a good view of them.
Dialogue: 0,0:03:27.04,0:03:29.31,Default,,0000,0000,0000,,So that's the entire\Nstructure of the flower,
Dialogue: 0,0:03:29.31,0:03:32.49,Default,,0000,0000,0000,,with the sepals coming out of\Nthe receptacle at the base,
Dialogue: 0,0:03:32.49,0:03:35.73,Default,,0000,0000,0000,,the petals above them, which are\Nthere to attract insects, which
Dialogue: 0,0:03:35.73,0:03:37.20,Default,,0000,0000,0000,,is why they're brightly colored.
Dialogue: 0,0:03:37.20,0:03:39.66,Default,,0000,0000,0000,,The female system is\Nknown as the carpel, which
Dialogue: 0,0:03:39.66,0:03:42.87,Default,,0000,0000,0000,,contains the ovary at the\Nbottom with ovules inside of it,
Dialogue: 0,0:03:42.87,0:03:45.12,Default,,0000,0000,0000,,the style above that, and\Nthe stigma at the top.
Dialogue: 0,0:03:45.12,0:03:47.67,Default,,0000,0000,0000,,And the stigma is the place\Nthat receives the pollen.
Dialogue: 0,0:03:47.67,0:03:50.19,Default,,0000,0000,0000,,The male part is known\Nas the stamen, which
Dialogue: 0,0:03:50.19,0:03:53.82,Default,,0000,0000,0000,,consists of anthers at the top of\Nit and the filament beneath it,
Dialogue: 0,0:03:53.82,0:03:54.63,Default,,0000,0000,0000,,supporting it.
Dialogue: 0,0:03:54.63,0:03:57.98,Default,,0000,0000,0000,,[MUSIC PLAYING]