science

Ordinary table salt is sodium chloride. What is baking soda?

• Potassium chloride

• Potassium carbonate

• Potassium hydroxide

• Sodium bicarbonate

Plants receive their nutrients mainly from

• chlorophyll

• atmosphere

• light

• soil

Most fish do not sink in water because of the presence of

1. 1.swim bladder

2. 2.air bladder

3. 3.air sacs

4. 4.air in spongy bones

• I and II are correct

• II and III are correct

• III and IV are correct

• I, II, III and IV are correct

Plants synthesis protein from

• starch

• sugar

• amino acids

• fatty acids

Which of the following physical properties about diamond is correct?

• high thermal conductivity

• hardness

  high strength

• high electricity resistance

• all of the above

The most electronegative negative element among the following is

• Na

• Br

• f

the metal used to recover copper from the solution of copper sulphate is

• Na

• Ag

• Hg

• Fe

1,4,9,16,25,30,49,___,81,100

• 64

• 76

• 74

• 72

The bacteria found in the root nodules of leguminous plants

Transpiration is

• the movement of water through a plant from the roots up the stem
• the loss of water from the leaves of a plant by the process of evaporation
• the flow of water into plant roots by osmosis from the soil
• the process of minerals and sugars moving through plant veins