MCQ
A dicotyledenous plant showing parallel venation is
- ADioscorea
- BSmilax
- ✓Calophyllum
- DHibiscus
Exceptionally few dicots show parallel venation, e.g., Calophyllum and Eryngium.
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$(i)$ Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosine and sprayed on to vulnerable plants
$(ii)$ B. thuringiensis are used to control butterfly caterpillars, but leave other insects unharmed
$(iii) $ The toxin of B. thuringiensis is released in the blood of larvae and the larvae get killed
$(iv)$ By the development of methods of genetic engineering B. thuringiensis toxin genes have been introduced