Important ions

Question 1

Calcium (Ca2+)

Answer 1

• Nerve impulse transmission across synapse
• Muscle contraction

Question 2

Sodium (Na+)

Answer 2

• Nerve impulse transmission
• Kidney function

Question 3

Potassium (K+)

Answer 3

• Nerve impulse transmission
• Stomatal opening

Question 4

Hydrogen (H+)

Answer 4

pH determination

Question 5

Ammonium (NH4+)

Answer 5

Production of nitrate ions by bacteria

Question 6

Nitrates (NO3-)

Answer 6

• Nitrogen supply to plants
• Assimilated into amino acids and proteins

Question 7

Hydrogen carbonate (HCO3-)

Answer 7

Transport of carbon dioxide in blood

Question 8

Chloride (Cl-)

Answer 8

Balances positive charge of Na+ and K+ ions

Question 9

Phosphate (PO43-)

Answer 9

• Cell membrane formation (phospholipids)
• Nucleic acid formation
• ATP formation

Question 10

Hydroxide (OH-)

Answer 10

pH determination