37. Evolution increases:
- popdations
- organisms
- biodiversity
- none
Answer:
biodiversity
38. Propagation of transgenic plants is possible by
- cloning
- hydroponics
- selection
- all of these
Answer:
cloning
39. An aphid that attacks walput tree is being controlled by:
- wasp
- drosophila
- mosquito
- bacteria
Answer:
wasp
40. Algae have been found to reduce pollution of heavy metals by :
- bioabsorption
- biological control
- biomagnification
- all of these
Answer:
bioabsorption
41. Lead free petrol is necessary to reduce the :
- pollution
- CO
- SO2
- CO2
Answer:
pollution
42. Number of naturally occurring elements are:
- 90
- 92
- 94
- 96
Answer:
92