[PPSC Analyst 2022]
16. Which of the following has been linked to excessive UV-B exposure?
Skin cancer
Ricketts
Multiple sclerosis
All of the above
17. Common indicator organism of water pollution is:
Entamoeba histolytica
Escherichia coli
Eichhornia crassipes
Lemna paucicostata
18. Trichoderma harzianum has proved a useful microorganism for:
Reclamation of wastelands
Bioremediation of contaminated soils
Biological control of soil-borne plant pathogens
Gene transfer in higher plants
19. What is the name of a species that is highly connected to the entire food web and whose loss may result in ecosystem collapse?
Limiting species
Keystone species
Vital species
Top species
20. The metal which is generally absorbed by plants along with Zn and causes “Ouch Ouch” disease in human beings is
Pb
Cd
Hg
Cr