Which phenomenon allows plants to move water from roots to leaves?
Anonymous Quiz
19%
Reverse osmosis
24%
Capillarity and surface tension
55%
Root osmotic pressure and cohesion-tension
2%
Gravity alone
Which planet rotates in a retrograde direction?
Anonymous Quiz
17%
Mars
42%
Saturn
30%
Venus
11%
Neptune
What is water photolysis?
Anonymous Quiz
6%
Breakdown of water by heat
72%
Splitting of water using light energy in photosynthesis
11%
Evaporation of water from leaves
10%
Reduction of H₂O to hydrogen
❤1
Which rock forms from the metamorphism of limestone?
Anonymous Quiz
34%
Granite
13%
Gneiss
37%
Marble
16%
Quartzite
What is an electromagnetic field?
Anonymous Quiz
23%
Gravitational force between charges
54%
A disturbance of space generated by charges and currents
5%
Surface tension of water
19%
Force field of permanent magnets
Which brain structure produces hormones?
Anonymous Quiz
9%
Hippocampus
26%
Cerebellum
63%
Pituitary gland (hypophysis)
2%
Amygdala
What is the Heisenberg uncertainty principle?
Anonymous Quiz
65%
You cannot simultaneously measure position and momentum of a particle with arbitrary precision
28%
The energy of a particle is always uncertain
4%
A particle cannot be in two states at once
2%
Light has no mass
What reagent is used to detect CO₂ in an experiment?
Anonymous Quiz
58%
Limewater (Ca(OH)₂)
26%
Hydrogen peroxide
13%
Phenolphthalein
3%
Universal indicator
What is a coral reef ecosystem?
Anonymous Quiz
12%
An underwater desert
70%
One of Earth's most biodiverse ecosystems
14%
An ecosystem devoid of vertebrates
5%
A form of mass parasitism
❤1
Which law describes the relationship between current, voltage and resistance?
Anonymous Quiz
19%
Faraday's law
70%
Ohm's law
6%
Kirchhoff's law
4%
Ampere's law
What is mitochondrial DNA?
Anonymous Quiz
15%
DNA in the cell nucleus
75%
A small circular genome in mitochondria, inherited maternally
4%
Viral DNA integrated into the genome
5%
Mitochondrial messenger RNA
❤2
What causes the aurora borealis?
Anonymous Quiz
6%
Refraction of sunlight in clouds
77%
Interaction between solar wind and Earth's magnetic field
15%
Reflection of moonlight on the atmosphere
2%
Chemical reaction between O₃ and N₂
❤2
What is alpha radioactivity?
Anonymous Quiz
3%
Emission of electrons
22%
Emission of gamma rays
69%
Emission of a helium nucleus (2 protons + 2 neutrons)
6%
Emission of neutrons
❤3
What is the pancreas's role in digestion?
Anonymous Quiz
6%
Produces hydrochloric acid
88%
Secretes digestive enzymes (lipase, amylase, protease) into the duodenum
4%
Absorbs nutrients
2%
Stores glycogen
❤2👍1
What is spectroscopy?
Anonymous Quiz
10%
Study of DNA structure
78%
Analysis of light emitted or absorbed by a substance
10%
Measurement of sound wave speed
3%
Study of gravitational tides
❤3
Which type of reaction releases heat (is exothermic)?
Anonymous Quiz
10%
Photosynthesis
17%
Water electrolysis
49%
Combustion
25%
Dissolution of NaCl in water
❤2