Why does the inside of an apple turn brown?

Why does the inside of an apple turn brown?

When an apple is cut (or bruised), oxygen is introduced into the injured plant tissue. When oxygen is present in cells, polyphenol oxidase (PPO) enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colorless precursors to brown-colored secondary products.

Why do we put candles on top of birthday cakes?

Some believe that the tradition of birthday candles began in Ancient Greece, when people brought cakes adorned with lit candles to the temple of Artemis, goddess of the hunt. The candles were lit to make them glow like the moon, a popular symbol associated with Artemis.

Why are the atomic masses listed on the periodic table not whole numbers?

The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes. Being an average it would be most unlikely to be a whole number. The mass of an individual atom in atomic mass units is the mass relative to carbon-12.

Which famous person was the teddy bear named after?

A 1902 political cartoon in The Washington Post spawned the Teddy bear name. The name Teddy Bear comes from former United States President Theodore Roosevelt, who was commonly known as “Teddy” (though he loathed being referred to as such).

Why is it called a tom boy?

Since “Tom” was a name for the common or archetypal male, a particularly rowdy boy was perhaps called a “Tom boy” as another way of saying he was especially boyish – a boy’s boy, in other words. “Tomboy” soon took on another meaning, according to the OED, that of “a bold or immodest woman.”

What animals eat spiders?

Because they are small, spiders have many enemies. Larger animals, such as birds, toads, lizards and monkeys, hunt them. But they are also used as food by many smaller creatures. Ticks will attach themselves to a spider and eat away at it for a long time while the spider goes about its business.

How old was the oldest mother to give birth?

Rajo Devi became the oldest woman in recorded history to ever give birth on November 28, when the 70-year-old delivered a baby girl in India. Married for 50 years, she had been trying, without success, to have a child for much of that time, until she entered menopause (which was 20 years ago).

How many islands does Venice have?

Venice captured the impression of a magical floating city by setting wood pilings on the 118 submerged islands in the Northern end of the Adriatic Sea. 400 foot bridges and 170 boat canals connect the city to make it easily accessible to the local populace.