Read the Crop Examples by Mechanism
Crop-biotechnology questions test the target pest, the silencing sequence or the nutrient pathway being changed.
Crop Biotechnology is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Protect crops from pests
Meloidogyne causes root-knot disease. Agrobacterium causes crown gall, often around wounded stem tissue. Bt Cry proteins damage susceptible insect larval gut cells.
Silence a target gene
In RNA interference, a target-specific sequence is introduced; transformed plant cells produce double-stranded RNA. RISC/Argonaute uses a guide strand to recognise and silence matching nematode mRNA.
Enrich a crop
Golden Rice uses genes from daffodil and Erwinia to produce β-carotene, a vitamin-A precursor, in the grain.
OlympIQ exam lens
- ✓Root-knot → Meloidogyne; crown gall → Agrobacterium.
- ✓Bt Cry protein → insect gut damage.
- ✓RNAi: target gene → dsRNA → RISC → silencing.
- ✓Golden Rice → β-carotene from daffodil/Erwinia genes.
Do not confuse the crop’s target pest with the bacterium used as a transformation vector.
Ready to try the pattern?
100% coverage across the 5 linked questions.
Practise 5 linked questions