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Mineral Nutrition

Multiple Choice Questions

71.

Heterocysts in Anabaena is helpful in

secondary growth
nitrogen-fixation
ion uptake
gaseous exchange

72.

The statement given below are the deficiency symptoms of a certain element. Identify the element with the help of options that follow.

I. Stunted growth

II. Tissue necrosis

III. Curling appear first in young leaves

IV. Premature flower abscission

Choose the correct option

magnesium
boron
calcium
nitrogen

73.

The nitrifying bacteria that convert the ammonia to nitrates are

Nitrosomonas and Nitrobacter
Azotobacter
Rhizobium sp.
Thiobacillus denitrificans

74.

Insectivorous plant is

Cuscuta
Drosera
Striga
None of the above

75.

Nodules with nitrogen-fixing bacteria are found in

cotton
gram
mustard
wheat

76.

Mycorrhiza is an example of

endoparasitism
decomposers
symbiotic relationship
ectoparasitism

77.

A metal ion involved in stomatal regulation is :

iron
potassium
zinc
magnesium

78.
The plant ash is an indication of :

organic matter of plant

waste product

mineral salts absorbed by plants

none of these

mineral salts absorbed by plants

The ash that is left after burning any dry part of the plant in a crucible, contains only mineral elements and is called plant ash. If dried plant parts are heated in silica crucible at 600 $°$ C, all organic substance vaporize and the remaining plant ash contains only inorganic substances or absorbed mineral elements.