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Biology Tuition Singapore O Level Biology Tuition – Transport in Flowering Plants Common Misconception   Misconception 1 Xylem vessels have lignified walls and are often referred to as impermeable Correct Concept 1 Xylem vessels cannot be impermeable or else nothing can pass through them. The lignin exists only as spiral rings. It is not coated all over the walls. For example, the pits of the walls are not lignified and substances can pass through them. Lignin is only present to increase the rigidity of the walls and provide mechanical support to them, but not to change their permeability   Misconception 2 Both xylem vessels and phloem sieve tubes are made of dead cells Correct Concept 1 Only xylem vessels are made of dead cells. Mature sieve tube elements are living cells ...

Physics Tuition Singapore O level Physics Tuition – Kinetic Model of Matter Common Misconception   Misconception 1 Gases are compressible because their particles are soft and flexible but solids are incompressible because their particles are hard and inflexible. Correct Conception 1 In the kinetic theory of matter, we assume the particles are hard and have a fixed shape, even for gases. Gases are compressed purely by reducing the space between their particles, but the volume of each particle does not change   Misconception 2. In the Brownian motion experiment,  we can see air particles colliding with the smoke particles Correct Conception 2 In the Brownian motion experiment, we cannot see air particles. We conclude that air particles collide with  the smoke particles from t ...

Chemistry Tuition Singapore O level Chemistry Tuition – Oxidation and Reduction Common Misconception   Misconception 1 The oxidation number of hydrogen is 1 and the oxidation number of oxygen is 2. Correct Conception 1 The `+’ and `—’ signs must be shown. Thus, the oxidation number of hydrogen is +1 and the oxidation number of oxygen is —2.   Misconception 2 A substance is always an oxidising agent or a reducing agent in all reactions. Correct Conception 2 Some substances, such as sulfur dioxide, SO2, hydrogen peroxide, H202, and sodium nitrite, NaNO2, can act as both oxidising and reducing agents.   Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Chemistry Tuition O level N Level NA Level Chemistry Tuition Singapore.

Tuition Singapore Primary English Tuition Singapore- Vocabulary   James was so nervous during the oral examination that it _________________  his ability to perform his very best and as a result, he could not elaborate on his points. impeded enhanced accelerated deteriorated   Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Primary English Tuition Primary 1 to 6 English Tuition Singapore    

Tuition Singapore Primary Maths Tuition Singapore – Discount   Kimberly bought a bag at a discount of 20%. if the original price of the bag was $150, how much did Kimberly pay? $30 $120 $130 $180 Answer (2)   Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need Primary Math Tuition Primary 1 to 6 Maths Tuition Singapore