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Consideer the following statements I. ...

Consideer the following statements
I. sulphur is present in two amino acids cysteine and valine
II. Lower level of N,K,S and Mo causes inhibition of cell division.
III. Microbe that fix nitrogen in the roots of non-leguminous plants alums in frankia
IV. Denitrification is carried by bacteria Nitrosomonas and nitrobacter
Select the correct pair of statements.

A

I and II

B

I and III

C

II and III

D

II and IV

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we will analyze each statement one by one to determine which ones are correct. ### Step 1: Analyze Statement I **Statement I:** Sulphur is present in two amino acids cysteine and valine. - **Analysis:** Sulphur is indeed present in cysteine and methionine, but it is not present in valine. Therefore, this statement is **incorrect**. ### Step 2: Analyze Statement II **Statement II:** Lower levels of N, K, S, and Mo cause inhibition of cell division. - **Analysis:** Nitrogen (N), Potassium (K), Sulphur (S), and Molybdenum (Mo) are essential nutrients for plants. A deficiency in these nutrients can lead to reduced cell division and overall growth. Therefore, this statement is **correct**. ### Step 3: Analyze Statement III **Statement III:** Microbe that fixes nitrogen in the roots of non-leguminous plants is Frankia. - **Analysis:** Frankia is indeed a genus of bacteria that forms symbiotic relationships with non-leguminous plants (like Alnus) to fix nitrogen. Therefore, this statement is **correct**. ### Step 4: Analyze Statement IV **Statement IV:** Denitrification is carried by bacteria Nitrosomonas and Nitrobacter. - **Analysis:** Nitrosomonas and Nitrobacter are known as nitrifying bacteria, which convert ammonia to nitrites and then to nitrates. Denitrification, which converts nitrates back to atmospheric nitrogen, is carried out by different bacteria, such as Pseudomonas. Therefore, this statement is **incorrect**. ### Conclusion Based on the analysis: - Statement I: Incorrect - Statement II: Correct - Statement III: Correct - Statement IV: Incorrect The correct pair of statements is **II and III**. ### Final Answer The correct pair of statements is **II and III**. ---
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