G.S. Test

During photosynthesis, plants give off ______. This helps maintain the balance of oxygen and carbon dioxide in the air.

• carbon dioxide

• oxygen

• sugar

• chlorophyll

• photosynthesis

Which of the options below is NOT the properties of air?

• octorless

• colourless

• has no mass

• has weight

How does photosynthesis work?

Answer explanation

During photosynthesis, plants give off oxygen by maintaining the balance of oxygen and carbon dioxide in the air.

______ develops when abnormal cells in the body grow and multiply.

Which one below is a property of water?

• No weight

• No smell

• No mass

What is pressure?

Answer explanation

• Pressure is defined as a measure of force applied over a unit area.  

How can we put out fires?

Answer explanation

• Fires go out when either heat, fuel or heat in the fire triangle is removed.

Starting from the left, the candle is called in an alphabetical order. The most left candle is called A. The most right candle is called D. According to the experiment from the picture, which candle will be the last to go out? A, B, C, or candle D?

• Candle A

• Candle B

• Candle C

• Candle D

• All going out at the same time

Answer explanation

Candle C, because the glass cup on it is the biggest and also the longest. It trapped more oxygen than other candles.

1. Describe how filtration work in water.

Answer explanation

• Filtration is a process of separating solid matter from liquid by causing the latter to pass through the filter medium. It only allows the fluid to pass through but not the solid. 

Where below cannot find any fresh water? (Answer could be more than one)

• River

• Sea

• Well

• Reservoir

• Pond