# GATE2018-20

Which one of the following plant secondary metabolites is a natural insecticide?

1. Digitoxin
2. Pyrethrin
3. Salicylic acid
4. Avenacin A-$1$

edited

## Related questions

1
In leguminous plants, both the rhizobium genes and the plant genes influence nodulation and nitrogen fixation. Which one of the following functions is NOT encoded by the host plant genes? Production of inducers that modify rhizobial cell wall Production of flavonoid inducers Establishment of contact between bacteria and legume Root hair curling
2
Which one of the following is an example of a neurotoxin? Cholera toxin Streptolysin-O Botulinuin toxin Diphtheria toxin
A single stem cell undergoes $10$ asymmetric cell divisions. The number of stem cells at the end is _________
In a detailed study of annual crow births in India, it was found that there was relatively no growth during the period $2002$ to $2004$ and a sudden spike from $2004$ to $2005$. In another unrelated study, it was found that the revenue from cracker sales ... birth rate. If cracker sale declines, crow birth will decline. Increased birth rate of crows will cause an increase in the sale of crackers.