Daily Trivia Quiz - Day 251 (2026-07-20)

Question 1

Why does taking a probiotic not mean it will permanently settle in your gut?

Accepted Answer

Most strains stay only temporarily, and effects depend on the gut environment

Answer

Probiotics replace the existing gut microbiome automatically

Answer

All probiotic strains become dominant gut bacteria

Answer

One dose of probiotics creates stable long-term colonization

Question 2

Why must immune cells tell 'self' from 'foreign'?

Accepted Answer

They need to avoid attacking the body while detecting infection and abnormal cells

Answer

They identify targets only by cell size

Answer

They help red blood cells judge oxygen levels

Answer

They help intestinal cells choose which sugars to absorb

Question 3

Why do veins look blue even though the blood that comes out is not blue?

Accepted Answer

Hemoglobin makes blood red; venous blood is just darker

Answer

Venous blood is blue until it touches air

Answer

Blood vessel walls dye clear blood red

Answer

Platelet pigments determine the color of blood

Question 4

Desert plants such as camelthorn are often 'small above, deep below.' What strategy does that reflect?

Accepted Answer

They limit thirsty above-ground growth and invest more in roots for water

Answer

They move most photosynthesis into the roots

Answer

They keep above-ground stems away from all insect feeding

Answer

Deep roots absorb water directly from the air

Question 5

Why are cancer cells dangerous for more than just growing fast?

Accepted Answer

They can escape controls, invade tissue, and sometimes spread

Answer

They mainly just live longer than ordinary cells

Answer

They only grow in the original tissue and stay there

Answer

They exist only in places without oxygen

Question 6

Why did some of Paganini's contemporaries describe him as if he had made a deal with the devil?

Accepted Answer

His virtuoso technique exceeded what many listeners thought possible

Answer

His strings were tuned far below normal pitch

Answer

His performances relied on hidden backstage players

Answer

His works used only an unusually low register

Question 7

Why is 4'33" not simply 'nothing being performed'?

Accepted Answer

It turns ambient sound and audience attention into the material of the piece

Answer

It asks the performer to silently sing the melody internally

Answer

It became silent because pages were missing from the score

Answer

Its point is to prove a stage can exist without an audience

Question 8

Why can a nutrition label say '0 trans fat' even if the food is not absolutely free of it?

Accepted Answer

Labeling rules often allow values below a threshold to be rounded to 0

Answer

Trans fat exists only in raw meat

Answer

A label value of 0 means the fat disappears in the body

Answer

Trans fat below the labeling threshold has no biological effect

Question 9

Drip irrigation does not soak the whole field like flood irrigation. Where does it save water?

Accepted Answer

It sends water to the root zone, reducing wasted evaporation and runoff

Answer

It first spreads water across the surface, then lets it sink slowly

Answer

It makes crops absorb water mainly through leaves

Answer

It keeps the root zone permanently waterlogged

Question 10

Why should you avoid stepping on the thin, crusty-looking surface in some deserts?

Accepted Answer

It may be biological soil crust that stabilizes the surface

Answer

It is mainly a temporary mud film after rain

Answer

It is usually a pure salt layer left by groundwater

Answer

It is lifeless sand compacted only by wind