1. Lots of urea and phosphate fertilizer were used in the crops in the vicinity
2. The area was sprayed with DDT by an aircraft
3. The lake water turned green and stinky
4. Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis
Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis
1. produce gametes
2. utilise oxygen to generate energy
3. use solar energy for metabolic activities
4. replicate the genetic information
replicate the genetic information
1. r-RNA
2. t-RNA
3. mt-DNA
4. m-RNA
t-RNA
1. bioremediation of contaminated soils
2. reclamation of wastelands
3. gene transfer in higher plants
4. biological control of soil-borne plant pathogens
biological control of soil-borne plant pathogens
1. non-conservative
2. semi-conservative
3. flexible
4. conservative
semi-conservative
1. grasslands
2. agro-ecosystems
3. oceans
4. forests
oceans
1. 0.34 nm
2. 20 nm
3. 2 nm
4. 3.4 nm
3.4 nm
1. low moisture content
2. poor nitrogen content
3. anaerobic environment around them
4. low cellulose content
low moisture content
1. Down's syndrome
2. Turner's syndrome
3. Klinefelter's syndrome
4. Tay-Sachs disease
Down's syndrome
1. Y-chromosome is essential for sex determination in Drosophila
2. Y-chromosome is female determinating in Drosophila
3. Y-chromosome is male determining in human beings
4. Y-chromosome has no role in sex determination either in Drosophila or in human beings
Y-chromosome is male determining in human beings