Match the LIST-I with LIST-II
| LIST-I | LIST-II |
|---|---|
| Organisms | Applications |
| A. Glomus | I. Biocontrol agent |
| B. Azospirillum | II. Protection against aphids |
| C. Trichoderma | III. Phosphorous absorption |
| D. Ladybird | IV. Nitrogen fixation |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-III, B-IV, C-I, D-II
(A) Glomus — this matches (III) Phosphorous absorption. Glomus forms a mycorrhiza with plant roots. The fungus absorbs phosphorus from the soil and passes it to the plant.
(B) Azospirillum — this matches (IV) Nitrogen fixation. It is a free-living soil bacterium that fixes atmospheric nitrogen and adds to the nitrogen content of the soil.
(C) Trichoderma — this matches (I) Biocontrol agent. These free-living fungi are effective biocontrol agents of several plant pathogens.
(D) Ladybird — this matches (II) Protection against aphids. The ladybird beetle feeds on aphids and so protects crops from them.
Note: A ladybird is also a biocontrol agent, so (I) could fit both Trichoderma and the ladybird. But (II) fits only the ladybird. So the ladybird takes (II), Trichoderma takes (I), and Option (4) is the only consistent answer.