What’s the Magical Function of Green Leaves?

papaya leavesLeaves are the most important organ for plants to conduct photosynthesis and transpiration.Meanwhile, nutrients, which are vital for the growth of plants is produced in leaves.

Leaves could conduct photosynthesis, take in carbon dioxide and produce oxygen. Leaves of some plants could even take in poisonous gases such as carbon dioxide, monoxide and chlorine, making air fresher.

As is proved by scientists, 1 tons of leaves could take in 10-30 kilogram carbon dioxide and chlorine. Each leave is a small factory, continually providing energy for plants, as well as providing oxygen essential for human life. It could be said that there would be no life on earth if there is no photosynthesis by leaves. Besides, leaves also conduct transpiration。

800px-Leaf_function

-Vojtech.dostal

The major functions of green leaves are as following:

  •  It is the source of nutrients and fertilizer
  • It is the most important industrial raw materials
  • Their medical use could not be neglected
  • Leaves could be made as instrument.

 See more…………. A Video introduce parts of leaves

Have a Think

Leaves is the most important organ to ( )

A. absorb water             B. dehydration              C. photosynthesis

Answers: C

Do Trees Have Fever?

Trees fall ill when lacking water. Their temperature would also rise when lacking water.Besides, temperature in different part of the tree is different.

450px-Ash_Tree_-_geograph.org.uk_-_590710

-Wikimedia Commons

The change of temperature of leaves is the most obvious.

During the daytime, the leaves mainly adjust temperature by transpiration. When there is enough water in the earth, the effect of transpiration is prominent. When there is not enough water, the leaves would close their pores under the sunlight. In this way, the transpiration is decreased and the temperature of the leaves rises.

The temperature of the sick trees would rise like that of men.When people get ill, their temperature rise at night and the fever is reduced in the morning.

However, this is quite contrary to the trees, whose temperature is highest in the morning.

According to the situation of the trees’ fever, the forest rangers could judge out which area of the forest is sick and take effective measures to cure them.

 

2. When do trees usually have most badly fever? ( )

A. in the morning              B. at noon                  C. at night

Answers: :A

Do Flowers Have Age?

People gain age when a year passes, so are the trees grow an age after 365 days. But do you know whether flowers have ages? No! But why?

Flower_poster_2

-Wikimedia Commons

Because no flower could keep blooming over a year. In this way, flowers’ age could not be counted by year, it could only counted by day or hour.

Orchid is a tropical flower, it could keep blooming for 80 days, which could be called the star of longevity in the flowers.The famous royal water lily could just keep blooming for 2 days.

There are some flowers with even shorter blooming days which could only be counted by hours, such as morning gloryetc. The shortest blooming flower is Cornflower, only blooms for 5 minutes to half an hour.

Have a Think

The shortest blooming flower is ( ).

A. corn flower                     B. peony        C. morning glory

Answers: A

How Plants Purify Air?


Plants are the air cleaner in the nature.

On one hand, it absorbs the carbon dioxide in the air and vomit oxygen, effectively reduce the carbon dioxide in air and making air more fresh.

photosynthesis-and-respiration-in-plants

-http://www.welcomeathome.com/garden/are-plants-in-bedroom-bad-for-your-health/

On the other hand, plants, especially forest or tropical plants, blocking, and absorbing the ashes in the air, refreshing the air.

In order to maintain life, human being have to take in oxygen and expire carbon dioxide.If the carbon dioxide in the air is too high, people would hardly breath and be toxicated. Plants are the only creature in the world to photosynthesis, besides, it is the absorber of carbon dioxide and producer of oxygen.

There are other plants which can take in toxic gas like sulfur dioxide and carbon monoxide. Besides, some plants could even take in some harmful radiation to human body, such as the cactus put in front of the computer could take in large amount of radiation sent out by the screen.

 

Have a Think

Plants are the air cleaner in the nature and they take in ( ) in air.

A. Carbon dioxide         B. oxygen                     C.ash

Answer: A

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