Daily challenge · 5 November 2026
Science and nature
0 players took on this challenge.
Question 1
How many legs does an adult insect usually have?
- A Four
- B Six
- C Eight
- D Ten
Adult insects have three pairs of legs, for a total of six.
Question 2
At about 25°C, what is the pH of pure water?
- A 3
- B 5
- C 7
- D 9
Pure water is neutral, with a pH of about 7 at 25°C.
Question 3
What is the deepest lake in the world?
- A Lake Tanganyika
- B Lake Baikal
- C Lake Superior
- D Lake Victoria
Lake Baikal in Siberia reaches a depth of about 1,642 metres.
Question 4
Which naturalist independently developed the idea of evolution by natural selection while working in the Malay Archipelago?
- A Alfred Russel Wallace
- B Jean-Baptiste Lamarck
- C Thomas Huxley
- D Gregor Mendel
Wallace developed the idea independently and sent his work to Charles Darwin in 1858.
Question 5
How many pairs of chromosomes are normally found in a human body cell?
- A 22
- B 23
- C 24
- D 46
A typical human body cell has 46 chromosomes arranged in 23 pairs.
Question 6
Which scale is commonly used to report an earthquake’s magnitude from seismic data?
- A Beaufort scale
- B Moment magnitude scale
- C Fujita scale
- D Mercalli scale
The moment magnitude scale estimates an earthquake’s size using its seismic moment.
Question 7
How many chromosomes are in a typical cell of the fruit fly Drosophila melanogaster?
- A 4
- B 8
- C 12
- D 16
The species has four pairs of chromosomes, or eight in total.
Question 8
Which site became the world’s first national park when it was established in 1872?
- A Yosemite
- B Yellowstone
- C Banff
- D Sequoia
Yellowstone National Park was established in the United States in 1872.
Question 9
Which bird lays the largest egg relative to its body size?
- A Kiwi
- B Emperor penguin
- C Ostrich
- D Albatross
Kiwi eggs are exceptionally large compared with the body size of the female.
Final question
At the triple point of water, what is the temperature on the Celsius scale?
- A −0.01°C
- B 0°C
- C 0.01°C
- D 0.61°C
Water’s triple point is defined at 0.01°C, where ice, liquid water, and water vapour can coexist in equilibrium.