The passage describes reproduction in flowering plants.
Complete the passage by writing a suitable word in each blank space.
Flowers are organs that allow plants to carry out .............................. reproduction. The male gamete is contained within the .............................. grains. These grains are released from the .............................. , which is found on top of the filament. These grains need to land on the .............................. , the female part of the flower. Grains can be transferred by wind or by animals. These animals are often insects such as .............................. or butterflies. The petals of insect-pollinated plants are often .............................. and brightly coloured. After pollination, the grains germinate and a tube grows down the ..............................to reach the ovary. In the ovary, the gametes fuse. This process is known as.............................. .
Once the seed has been produced it can then germinate, but only in the correct conditions.
Temperature is one factor that affects the rate of germination.
Name two other factors.
A student investigated the speed of seed germination at different temperatures.
To do this they placed 20 cress seeds on a layer of moist cotton wool in a petri dish.
They set up three of these plates and placed them in different temperature conditions: one at 10 °C, one at 30 °C, and one at 50 °C.
They recorded how long it took for 15 of those seeds to germinate.
The results were as follows:
Temperature (°C) | Time taken for 15 seeds to germinate (hours) |
|---|---|
10 | 26 |
30 | 13 |
50 | 15 seeds did not germinate after 5 days |
Explain the results shown in the table.
The diagram below shows the seeds shortly after germination.
Name part X and part Y of the germinating seed.
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