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  • It's AumSum Time.

  • Can you guess the title of my next video?

  • Hurry up.

  • Write your guess in the comments section below.

  • Why do snakes shed their skin?

  • Wait.

  • 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?

  • No.

  • 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 begins.

  • 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.

  • Ewww.

  • 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.

  • No.

  • Salt helps melt the ice and thus, clear the roads.

  • What?

  • 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.

  • No.

  • 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.

  • Alright!!

  • 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.

  • Well.

  • 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.

It's AumSum Time.

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B2 中高級 美國腔

蛇為什麼會脫皮?| 蛇的皮膚為什麼會脫落? (Why do Snakes shed their Skin? | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日
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