Mineral Nutrition

Which one of the following produces nitrogen fixing nodules on the roots of Alnus?

1. Rhizobium
2. Frankia
3. Rhodospirillum
4. Beijerinckia

Which of the following pair represents free living nitrogen fixing aerobic bacteria?

1. Pseudomonas and Thiobacillus
2. Rhizobium and Frankia
3. Azotobacter and Beijernickia
4. Anabaena and Rhodospirillum

Which of the following protects nitrogenase inside the root nodule of a leguminous plant?

1. Glutamate dehydrogenase
2. Catalase
3. leg haemoglobin
4. Transaminase

Match Column - I with Column - II. Choose the correct answer from options given below.

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Match the following concerning essential elements and their functions in plants Select the correct option

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
4. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are

1. Ammonia alone
2. Nitrate alone
3. Ammonia and oxygen
4. Ammonia and hydrogen

Thiobacillus is a group of bacteria helpful in carrying out :

1. Nitrification
2. Denitrification
3. Nitrogen fixation
4. Chemoautotrophic fixation

Which of the following elements is responsible for maintaining turgor in cells?

1. Sodium
2. Calcium
3. Magnesium
4. Potassium

In which of the following forms is iron absorbed by plants?

1. Ferrous
2. Both ferric and ferrous
3. Ferric
4. Free element

In which of the following all three are macronutrients?

1. Molybdenum, magnesium, manganese
2. Nitrogen, phosphorus, sulphur
3. Boron, Zinc, manganese
4. Iron, copper, molybdenum