Question

Match List I with List II 

Choose the correct answer from the options given below: 
 

• A. A - III, B - IV, C - II, D - I
• B. A - IV, B - II, C - I, D - III
• C. A - III, B - II, C - IV, D - I
• D. A - III, B - IV, C - I, D - II

Hint:

Heterocyst = Site of Nitrogen fixation in Blue-Green Algae.
Vermi = Worm (Earthworm).
Sesbania = Premier green manure crop.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks to match various agricultural practices, specialized microbial structures, and biofertilizer components with their correct biological associations.

Step 2: Detailed Explanation:

• Sesbania rostrata (A-III): This is a unique tropical legume used as green manure. It is famous for being a stem-nodulating plant, which allows it to fix significant amounts of atmospheric nitrogen even in waterlogged soils.

• Vermi-composting (B-IV): This is the process of converting organic waste into nutrient-rich compost using Earthworms. Species like Eisenia fetida are commonly used to break down organic matter rapidly.

• Heterocyst (C-II): These are specialized, thick-walled cells found in certain filamentous cyanobacteria like Anabaena. They provide an anaerobic environment required for the enzyme nitrogenase to function and fix nitrogen.

• Cyst (D-I): Azotobacter (a free-living N-fixer) produces cysts, which are metabolically dormant and highly resistant structures that help the bacteria survive adverse environmental conditions like desiccation.
Final Answer:
The correct matching is A-III, B-IV, C-II, and D-I. This corresponds to option (A).