Biology
Chemistry
Environmental science
Physics
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100

What is the function of mitochondria?

Produce energy to fuel cell activities

100

Water in a cup slowly "disappears" on a hot summer day. 

A. Condensation B. Deposition C. Freezing D. Evaporation

D. Evaporation

100
Name Earth's 5 climate system. 

Oops, there's only 4. 

Lithosphere, atmosphere, hydrosphere, and biosphere. 

:p

100

The name of "hot light source"? 


Incandescence. 
100

Name this compound: 

(NH4)2SO3

Ammonium sulfite

200

What is the function of small intestine? 

Why villi in the small intestine is important? 

Function of the small intestine: absorb water and nutrients

Importance of villi: maximize surface area for nutrient absorption in the small intestine. 

200

Draw the Bohr diagram for O2- (-2 charged oxygen ion). 

200

Find the climate zone for Italy in Europe. 

North temperate zone

200
Name 7 colours of visible light, and name the colour with longest wavelength. 

Red, orange, yellow, green, blue, indigo, purple. 

Red colour has the longest wavelength. 

200

During mitosis, during what stage do chromosomes first become visible?

Prophase

300

Inside a leaf, what type of cell is responsible for most photosynthesis? 

A. Spongy parenchyma cells

B. Palisade cells

C. Guard cells

D. Lower epidermal cells


B. Palisade cells



300

Finish in 30 seconds: 







Fe2O3: _____________

Copper(I) oxide:_____________

HBr(acid name):____________

Fe2O3: Iron(III) oxide

Copper(I) oxide: Cu2O

HBr(acid name): Hydrobromic acid

300

What is the cause of ocean currents? 

(hint: temperature, salt). 

Thermohaline circulation. 

300
On the Earth, there are hree types of electromagnetic radiation produced by the sun. 

infrared, UV rays, and visible light. 

300

Explain the relationship between cell division, cancer cells and healthy cells.

Healthy cells undergo 20-30 cell divisions in their whole life, where cancer cells can undergo an infinite number of cell divisions. 
400

List 4 specialized cells in human body. 

Red blood cells

Bone cells

Neurons

White blood cells

Sperm

Eggs

Epidermal cells...

400

Are acids and bases molecular, or ionic compounds? Explain using one balanced chemical equation. 

Ionic. 

HCl --> H+ + Cl-

Ca(OH)2--> Ca2+ + 2OH-

400

How can environmental scientists study yearly weather patterns?

By looking at tree rings. 

400

If you were painting the walls in your classroom, would you want the walls to exhibit specular or diffuse reflection?

Diffuse reflection for painting a classroom wall. 

Diffuse reflection occurs when light is scattered in different directions upon striking a rough surface. This helps to distribute the light evenly and reduces strong light reflection. Unlike specular reflection that's usually on mirror surfaces, diffuse reflection is ideal for painting walls as it creates a more uniform and pleasing appearance.



400
Name 3 types of surfaces that are translucent. 

Frosted glass, fog, sunglasses, a glass of clear apple juice...

500

Name three organs in the digestive system that food does not pass through.  

Liver, pancreas, and gallbladder

500

How do lakes become acidic?  What can be done to help with the problem?

Acid rain, chemical spills, increased carbon dioxide concentration in the atmosphere... 

Solution: liming.

500

The fossil shown below was found in Antarctica (south pole), where everywhere is covered by ice. What does this tell us about the past climate in Antarctica? 

Antarctica's temperature was once warmer than present days, where the climate can support leafy plant's growth. 

500

What is the difference between fluorescence and phosphorescence? 

Both light sources absorb UV light and emit visible light. However, fluorescence emits much more energy as visible light than phosphorescence. 

500

What is geoengineering? Will it effectively stop climate change? Explain. 

Geoengineering is human intervention in climate change by reducing solar radiation on Earth's surface. It costs a lot of money and scientist's investment in developing and implementing. 

Geoengineering is not the long-term solution for climate change, because it does not address global warming. 

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