B2 High-Intermediate US 57 Folder Collection
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Why do snakes shed their skin?
I'll explain.
When a snake grows, its outer skin layer called epidermis does not grow or get bigger with it.
Hence, the snake sheds its epidermis periodically to allow further growth of its body.
In addition to this, shedding also helps remove parasites present on the epidermis.
So, does the snake buy a new skin?
First listen.
Before shedding, the snake grows a new epidermis beneath the old one.
Secretes a fluid between the old and new epidermis.
This fluid helps separate the old epidermis
from the new one.

Once this is done, the process of shedding

To remove the old epidermis, the snake rubs its head against any hard surface.
Creating a tear either near mouth or near nose area.
Then, it drags and wriggles it body against any hard surface and slowly slithers out of the old epidermis.
How do bees make honey?
No idea.
To make honey, the worker honeybee sucks nectar from flowers and stores it in its honey stomach.
Once the worker bee returns to the hive, it
vomits the nectar into a processor honeybee's mouth.

In the processor bee's mouth and stomach,
an enzyme called invertase is added to the nectar.

Invertase breaks some nectar into simple sugars like glucose and fructose.
Then it vomits the partially converted nectar into another processor bee's mouth.
Who also adds more invertase helping breakdown more nectar.
This process goes on until most of the nectar is converted into simple sugars.
Then the mixture of simple sugars is stored
in the honeycomb.

At this point, the mixture is still watery.
Hence, the bees flap their wings which evaporates water and thickens the mixture to eventually form honey.
Why is salt added to icy roads?
To make ice tasty.
Salt helps melt the ice and thus, clear the

But how dude?
The freezing or melting point of water is
about 0 degrees Celsius or 32 degrees Fahrenheit.

When temperature drops below the melting point, water molecules bond together to form solid ice.
However, when temperature rises above the melting point.
The bonds break and the ice melts forming liquid water.
Now, when we add salt or sodium chloride to ice, it lowers the melting point causing solid ice to melt.
Form liquid even at temperatures
below 0 degrees Celsius.

Then, the salt dissociates in the liquid water forming sodium and chloride ions.
These ions make it harder for liquid water
molecules to again bond together and form ice.

Hence, the melting ice does not refreeze and thus, helps clear the roads.
Why do we have seasons?
Because of season fairies.
It is mainly because of our earth's axis.
Our earth's axis is tilted at an angle of
about 23.5 degrees.

Hence, as the earth revolves around the sun, sometimes the northern hemisphere points towards the sun.
While sometimes the southern hemisphere.
This causes seasons.
Oh man.
It is too complicated.
Let us observe the northern hemisphere to
learn more about seasons.

When the northern hemisphere points towards the sun.
The sunrays directly strike the northern hemisphere.
Thus, the temperatures are high, resulting
in summer season in that region.

However, when the northern hemisphere points away from the sun, the sun rays fall slanting on it.
Thus, the temperatures are low, resulting
in winter season.

But when the northern hemisphere is neither tilted towards nor away from the sun.
The temperatures are moderate, resulting in spring and autumn seasons.
Topic: Transpiration
Why do cacti have spines?
Maybe they want to look like porcupines.
Very funny.
Spines help cacti to reduce transpiration.
I know all about vibration, but what's this
new thing called transpiration?

Transpiration is the loss of water from aerial parts, like stems and leaves, in the form of water vapor.
These aerial parts contain stomata which allow water vapor to escape into the atmosphere.
So, shall we tape the ariel parts so that
the vapor won't escape?

Pay attention.
In deserts, where cactus usually grows, there is scarcity of water.
Also, due to high temperatures, the rate of
transpiration is very high.

Thus, the leaves of a cactus have modified
into spines.

Spines don't have stomata.
Thus, the rate of transpiration is reduced,
helping the cactus to save water.

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Why do Snakes shed their Skin? | #aumsum

57 Folder Collection
AumSum published on April 18, 2019
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