Biology : Mineral Nutrition

Natural reservoir of phosphorus is

• sea water

• animal bones

• rock

• fossils

Nitrogenase enzyme is a

• magnesium-iron protein

• molybdenum-iron protein

• iron-copper protein

• nickel-iron protein

Necrosis (die-back) ofthe tip of young leaves is caused due to the deficiency of

• iron

• manganese

• zinc

• copper

Read the following deficiency symptoms of micronutrients in plants.

I. Loosening of inflorescence in Cauliflower.

II. Apical necrosis of young leaves (reclamation disease).

III. Bronze colour in leaves

IV. Upper half a lamina falls down (whiptail disease)

V. Legume cotyledons with brownish spots (marsh spot disease)

Pick out the symptoms caused by the deficiency of molybdenium and choose the correct option.

• II, IV and V

• I, III and IV

• III and II

• I and IV

Which of the following is correctly matched for the deficiency symptom produced by them?

• Molybdenum - Disturbance in iron metabolism

• Sodium - Interfere with healthy growth of nails and hair

• Protein - Convulsions and hallucinations

• Riboflavin - Beri beri

Heterocysts in Anabaena is helpful in

• secondary growth

• nitrogen-fixation

• ion uptake

• gaseous exchange

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

The nitrifying bacteria that convert the ammonia to nitrates are

• Nitrosomonas and Nitrobacter

• Azotobacter

• Rhizobium sp.

• Thiobacillus denitrificans

Insectivorous plant is

• Cuscuta

• Drosera

• Striga

• None of the above

Nodules with nitrogen-fixing bacteria are found in

• cotton

• gram

• mustard

• wheat