Biology quiz

More questions about Biology

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

1. 1 Easy

   What carbohydrate is the main structural part of plant cell walls?

   Answer: Cellulose

   Why: Cellulose, a tough chain of glucose units, is the most abundant organic material on Earth and gives wood and plant stems their rigid strength.

2. 2 Medium

   Which island chain's giant tortoises and finches inspired Darwin?

   Answer: Galapagos Islands

   Why: A giant tortoise's shell reveals its island: domed where ground plants are lush, saddle backed on dry islands where food grows higher.

3. 3 Hard

   Which scientist first observed living cells under a microscope?

   Answer: Antonie van Leeuwenhoek

   Why: A Delft cloth merchant who never attended a university, he ground his own lenses and called the swarming specks his little animals.

4. 4 Easy

   Which plant hormone is primarily responsible for triggering fruit ripening?

   Answer: Ethylene

   Why: Ripe fruit gives off ethylene gas that ripens the fruit around it, which is why one bad apple really can spoil the whole bunch.

5. 5 Medium

   Why do ambush predators like cats have vertical pupils?

   Answer: To judge distance accurately

   Why: Of 44 ambush predators with vertical slits, 36 stood under 42 cm at the shoulder; tall hunters like tigers have round pupils.

6. 6 Hard

   Why can wood frogs survive being frozen solid in winter?

   Answer: High glucose concentrations

   Why: A frozen wood frog has no heartbeat, and 65 to 70 percent of its body water can turn to ice; liver glucose protects its cells.