Life quiz

More questions about Life

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   How do green plants convert raw sunlight and water into chemical energy?

   Answer: Photosynthesis

   Why: Early photosynthetic cyanobacteria released so much byproduct gas that they triggered Earth's first mass extinction.

2. 2 Medium

   How many hearts does an octopus use to pump blood?

   Answer: three

   Why: Two of them push blood through the gills, while the third serves the body and stops beating whenever the octopus swims, so it prefers crawling.

3. 3 Hard

   Which group has about five times the biomass of all ants on Earth?

   Answer: humans

   Why: A 2022 study estimated about 20 quadrillion ants on Earth, roughly 2.5 million for every person.

4. 4 Easy

   Inside living cells, what double-stranded molecule carries the master genetic blueprint?

   Answer: DNA

   Why: Unraveled DNA from a single human cell stretches about two meters long despite fitting into a microscopic nucleus.

5. 5 Medium

   Which animal shoots blood from its eyes to deter predators?

   Answer: horned lizard

   Why: Blood from sinuses around the eyes startles foxes and coyotes, but it has no effect on predatory birds such as roadrunners.

6. 6 Hard

   What type of infectious agent consists only of misfolded proteins?

   Answer: prion

   Why: Stanley Prusiner coined the name in 1982 from proteinaceous infectious particle and won the 1997 Nobel Prize in Medicine.