Match List-I with List-II
| LIST-I | LIST-II |
|---|---|
| Organisms | Relationships |
| (A) Baculoviruses | (I) Caterpillars |
| (B) Bacillus thuringiensis | (II) Biofertiliser |
| (C) Ladybird | (III) Arthropods |
| (D) Cyanobacteria | (IV) Aphid |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
(A) Baculoviruses — this matches (III) Arthropods. Baculoviruses are pathogens that attack insects and other arthropods. They act only on the target species, so they are used as narrow-range biocontrol agents that do not harm plants, birds or useful insects.
(B) Bacillus thuringiensis — this matches (I) Caterpillars. Dried spores of Bt are sprayed on plants. When a caterpillar eats the leaves, the toxin is released in its gut and kills it.
(C) Ladybird — this matches (IV) Aphid. The ladybird beetle eats aphids, so it is used for the biological control of this pest.
(D) Cyanobacteria — this matches (II) Biofertiliser. Cyanobacteria such as Anabaena, Nostoc and Oscillatoria fix atmospheric nitrogen. They add nitrogen to the soil, especially in paddy fields.