Flowers have a kind of cell called eleocyte filled with fragrant oil. Different flowers produce different fragrant oil, so they smell different. This oil would volatilize into the air with water, especially when the sunlight is strong, the fragrant oil could volatilize fast and the fragrance would be denser.
We don’t have to worry that the fragrant oil would be fully volatilized, because it could be produced constantly. It could not only reduce the water lost, but also attracts insects to gather honey and pollinate。
Flowers with bright color usually smell not dense. They always attract insects by their bright colors during their evolution, so they don’t have to send out fragrance.
As for those small flowers without bright color, they have strong fragrance, because they have to attract the insects by their fragrance.
The biggest flower in the world is Rafflesia，which is also called Rafflesia arnoldii。It grows in the tropical forest on Java and Sumatra islands in Indonesia.
– Wikimedia Commons
The longest diameter of the petal is 1.4 meters. 5 blood red petals is spotted with faint yellow plaque，looking like luxurious topaz sprinkling on the red velvet.
There is a big disk in the middle of the flower with diameter reaching to 0.3 meter. It seems like a big basin. Although the flower is large, its seeds is very small, which would broadcast themselves by attaching to animals’ feet.
Rafflesia has neither obvious root nor any stems and leaves. It inhabit on the rhizome of the wild rattan in the tropical forest, absorbing nutrients to raise themselves.
It need only few days from grow to bloom. We can smell slight fragrance when it just bloom, but after 4 days when it began to wither，it has a smell of odour, attracting flies and insects to transmit flower powder for them. In few weeks, the flowers began to curl，becoming sticky mash.
Rafflesiawas found by English people in 1818 on the Sumatra. Now this flower is near extinction.
Have you ever look to sky and see a streak of light? Well, in fact those are not stars, actually, they are meteoroids. The light you can see is the result of the meteoroid that burned up as enters the planet’s atmosphere, trying to make their way through to arrive to the Earth.
A meteoroid is a small particle from a comet or asteroid. Many meteors appearing seconds or minutes apart that seem to fall from the same point in the sky are called a meteor shower.
They have a wide range of sizes, from dust particles to around 10 metres in diameter (although larger objects are usually referred to as asteroids).
The fastest meteoroids travel through the solar system at a speed of around 42 kilometres per second (26 miles per second).
A Indian botanist whose name is Bose has carried out an experiment: he waved a rake before a plant. As a result, the tentacles of the plant wave together with the rake, as if the plant is forbidding any harm from rake by waving its tentacles. Based on the experiment, Bose made an assumption that a plant has a heart. Besides, Bose invent a Cardiac curvometer and found out that the plants not only have hearts, but also have impulse. And the activity circle of the hearts is 1 minutes.
Assumed that the plants have hearts, they would have emotions.
In 1996, a scientist called Baxter has connected the Lie detector’s electrode to one of the leaves of dragon tree. He watered the dragon tree first and a smooth sawtooth-like curve has appeared on the detector. It seems that the dragon tree was feeling comfortable.
Then, he dipped one of the leaves into hot coffee, the reaction on the detector sent out a response of slight fear, which is not too terrible.
However, when he decided to burn this leave and held burning match near the dragon tree，the needle on the detector showed a strong wave. And apparently, this is the reaction of fear. When Baxter take back the match，the detector showed that the dragon tree has resumed normal state.
Now you may understand that trees have emotions like people. So we must take care of them!
Have a Think
When you hold a fire near a sapling，will it feels fearful? ( )
Bees are very important for our ecosystem and for agriculture. They play a crucial role in pollinating flowers. Pollination is the way in which the male part of a flower reaches the female part so that a new plant can grow. Continue reading →