Biological importance of magnesium and calcium - class-XI

Question 1 Multiple Choice (Single Answer)

Select the correct statement about $Mg^{2+}$ ions :

These ions are concentrated more in intracelluar then in extracellular fluids in animal bodies
Activation of phosphate transfer enzyme takes place in their presencde
They are involved in carbohydrate metablism
All are correct statement

Question 2 Multiple Choice (Single Answer)

The ion helpful for controlling heart beating and muscle contraction is:

$Mg^{2+}$
$Na^{+}$
$K^{+}$
$Ca^{2+}$

Question 3 Multiple Choice (Single Answer)

Which of the following enzymes contain $Mg^{2+}$
ions?

Phosphohydrylase
Zymase
Phosphotransferase
1 and 3

Question 4 Multiple Choice (Single Answer)

Which of the following statements is false ?

${\text{M}}{{\text{g}}^{{\text{2 + }}}}$ ion form a complex with ATP
${\text{C}}{{\text{a}}^{{\text{2 + }}}}$ on are important in blood clotting
${\text{C}}{{\text{a}}^{{\text{2 + }}}}$ ion are not important in maintaining the regular beating of the heart.
${\text{M}}{{\text{g}}^{{\text{2 + }}}}$ ion are important in the green parts of plants.

Question 5 Multiple Choice (Single Answer)

Which of the following statement is false?

$Mg^{2+}$ ion forms a complex with $ATP$
$Ca^{2+}$ ions are important in blood clothing.
$Ca^{2+}$ ions are not important in maintaining the regular beating of the hear
$Mg^{2+}$ ions are important in the green parts of plants

Question 6 Multiple Choice (Single Answer)

Ripening of fruits can be caried out in presence of :

$Na _2SO _4$
$NaCl$
$CaCl _2$
$CaC _2$

Question 7 Multiple Choice (Single Answer)

Which one of the following has magnesium?

Vitamin $B _{12}$
Chlorophyll
Haemocyanin
Carbonic anhydrase

Question 8 Multiple Choice (Single Answer)

Ripening of fruits can be carried out in the presence of :

$Na _2SO _4 $
$NaCl$
$CaCl _2$
$CaC _2$

Question 9 Multiple Choice (Single Answer)

State True or False.

Magnesium is an essential constituent of chlorophyll, the green colouring matter of plants.

True
False

Question 10 Multiple Choice (Single Answer)

For a given sample of water containing the following impurities
$Mg{ \left( H{ CO } _{ 3 } \right) } _{ 2 }=73mg/L;\quad Ca{ \left( H{ CO } _{ 3 } \right) } _{ 2 }=162mg/L;\quad Ca{ SO } _{ 4 }=136mg/L$
$Mg{ Cl } _{ 2 }=95mg/L;\quad Ca{ Cl } _{ 2 }=111mg/L;\quad NaCl=100mg/L$
Then the total hardness (temporary and permanent) of above water sample is

$300ppm$
$350ppm$
$450ppm$
$500ppm$

Question 11 Multiple Choice (Single Answer)

The metal ions (charged particles) that are required for contraction of muscles in human beings and animals are ions of:

calcium
sodium
potassium
iron

Question 12 Multiple Choice (Single Answer)

Which of the following metals is required as a cofactor by all enzymes utilizing ATP in phosphate transfer?

K
Ca
Na
Mg

Question 13 Multiple Choice (Single Answer)

The main constituents of pearl are:

ammonium sulphate and sodium carbonate
aragonite are conchiolin
calcium carbonate and magnesium carbonate
calcium oxide and ammonium chloride

Question 14 Multiple Choice (Single Answer)

Select correct statement(s).

$Mg^{2+}$ ions are necessary for the activation of phosphate transfer enzymes.
Mg is present in chlorophyll of green plants.
Mg is present in chlorophyll used in photosynthesis in green plants.
All the above are correct statements

Question 15 Multiple Choice (Single Answer)

Chlorophyll, the green component of plants contains:

$Ca^{2+}$
$Be^{2+}$
$Mg^{2+}$
$Ba^{2+}$

Question 16 Multiple Choice (Single Answer)

Bones and teeth contain:

Calcium dihydrogen phosphate
Apatite
Calcium phosphide
None of the above

Biological importance of magnesium and calcium - class-XI

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