Why Flowers are Fragrant?

Rose has strong scent, osmanthus is sweet, orchid is fresh. Why the flowers could send out scent?

Listening a flower song at first

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.

rose

-khinhtwemya

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.

Have a Think

The eleocyte in the flower would secrete ( ).

A. aromatics          B. potpourri           C. aromatic oil

Answers: .C

Is Rafflesia the Biggest Flower in the World?

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.

rafflesia

– 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.

 see more ……   Twin blooming rafflesiawahttps

What is a shooting star?

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. 

bicycleastronomy.org

bicycleastronomy.org

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).

Around 15,000 tonnes of meteoroids, micrometeoroids and different forms of space dust enter Earth’s atmosphere each year!

If a meteor survives the plunge through the atmosphere and lands on the surface, it’s known as a meteorite.

A new pterosaur from the UK

An image of Vectidraco showing what bones were found. (Wikimedia, Darren Naish mail, Martin Simpson, Gareth Dyke(

An image of Vectidraco showing what bones were found. (Wikimedia, Darren Naish mail, Martin Simpson, Gareth Dyke)

A new pterosaur has been found from the Isle of Wight in the south of England. Its name is Vectidraco daisymorrisae which means daisy morris’ dragon of the Isle of Wight.

Daisy Morris is a nine-year-old girl who found the bones five years ago when on a walk with her family.

Palaenotlogists from the University of Southampton realised that it was something different and spent the next five years studying the bones. Finally they decided that they belonged to a new species.

Vectidraco daisymorrisae was a small animal in a world of giants. The fossil was a adult when it died but its wingspan was only about 75cm, about the size of a crow.

There is a lot unknown about Vectidraco as only a few bits of its skeleton was found, including its pelvis and a few vertebrae.

It lived 125 million years ago when England was a chain of tropical islands.

Could plants feel happiness, sadness and angry?

 

Happy-plants

-cooking greek.

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.

sad flower

– Danny

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

  1. When you hold a fire near a sapling,will it feels fearful?  ( )
  2. A Never              B. No             C. Yes

Answer: C.