Nitrogen

Q. What are the various steps involved in the formation of root nodule

Q.

Which of the following statements are true? If false, correct them:
(a) Boron deficiency leads to the stout axis.
(b) Every mineral element that is present in a cell is needed by the cell.
(c) Nitrogen as a nutrient element is highly immobile in the plants.
(d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities.

Q.

Which element is used in the synthesis of proteins?

Q.

Give two examples of nitrogen-fixing aerobic microbes that are free-living.

Q.

Assertion: Deficiency of sulphur causes chlorosis in plants.

Reason: Sulphur is a constituent of chlorophyll, proteins and nucleic acids.

1. Both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion.

2. Both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion.

3. Assertion is true but the Reason is false.

4. Both the Assertion and the Reason are false

Q. Plants cannot absorb nitrogen in the form of

1. $N_2$
2. ${{\mathrm{NO}}_2}^{-}$
3. ${{\mathrm{NO}}_3}^{-}$
4. ${{\mathrm{NH}}_4}^{+}$

Q.

Some plants contain nitrogen-fixing bacteria Rhizobium in their root nodules. This relationship is known as ____________.

1. aAn amensalism

2. a commensalism

3. a mutualism

4. Interspecific competition

Q.

Define ammonification.

Q. Which of the following is a free-living biocontrol microbial agent for plant pathogen?

1. $Mucor$
2. $Trichoderma$
3. $Rhizobium$
4. $Glomus$

Q.

What is the end product of denitrification?

Q. Microorganisms capable of fixing atmospheric nitrogen in the soil are

1. Soil fungi
2. Green algae
3. Bacteria
4. Bacteria and cyanobacteria

Q.

Who Is responsible for denitrification?

Q. Which of the following is considered to be the best chemical method of fixing atmospheric nitrogen?

1. Fisher method
2. Decan method
3. Haber-Bosch method
4. Parnas-Meyerhoff method

Q. Which was absent in the atmosphere at the time of origin of life?

1. $H_2$
2. $C{H}_4$
3. $N{H}_3$
4. $O_2$

Q. If wheat field is inoculated with $Rhizobium$

1. Soil will become rich in calcium
   
2. Soil will become nitrogen rich
   
3. Soil will be depleted of nitrogen
   
4. No effect on soil nitrogen
   

Q. Name any two free-living nitrogen fixing bacteria.

Q. Nitrogen is present in the environment as

1. a, b, c
2. b, c, d
3. a, b, c, d
4. None of these

Q.

In nitrogen cycle, atmospheric nitrogen is fixed by bacteria and converted into ammonia. Ammonia is further converted into other forms of nitrogen. At the end of the cycle nitrogen is returns to the atmosphere by the process of -

1. Ammonification

2. Nitrification

3. Denitrification

4. Assimilation

Q. Assertion :Reductive amination involves the transfer of amino group from one amino acid to the keto group of a keto acid. Reason: In reductive amination, transfer of $N{H}_2$ from glutamic acid takes place.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Nitrification includes

1. a only
2. b only
3. Both a and b
4. None of these

Q. What is not true for Ammonification?

1. Carried out by saprophytic microbes
2. Organic nitrogen is converted in ammonia
3. Carried out by Bacillus ramosus bacteria
4. Protein are directly converted into ammonia without any intermediate

Q. Symbiotic nitrogen fixation is carried out in the nodules of leguminous plants by ..........

Q. Which of the following is/are nitrogenous fertilizers?

1. Urea
2. Ammonium sulphate
3. Ammonium nitrite
4. Sodium nitrate

Q. Assertion :Azolla is used as biofertilizer in rice fields. Reason: Azolla contains nitrogen fixing cyanobacteria in its root nodules.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q.

The process that releases free nitrogen back into the air is known as

1. ammonification

2. nitrification

3. denitrification

4. purification

Q.

Which of the following statements are true? If false, correct them:

(a) Boron deficiency leads to stout axis.

(b) Every mineral element that is present in a cell is needed by the cell.

(c) Nitrogen as a nutrient element, is highly immobile in the plants.

(d) It is very easy to establish the essentiality of micronutrients because they

are required only in trace quantities.

Q. Ammonia formed in the process of biological nitrogen fixation is subsequently used for the synthesis of ..........

Q. Root nodules for nitrogen fixation of a non leguminous tree poses
a)Frankia
b)Rhizobium
c)Azotobacter
d)Thiobacillus

Q. The process that is the opposite of nitrogen fixation is

1. Ammonification
2. Denitrification
3. Nitrate reduction
4. Nitrification

Q.

If you cut through the root nodules of a pea plant you will notice that the central porion is red or pink. What makes the nodule pink mention the role of this pink pigment.