1. The percentage of Fresh water available in earth
a) 3%
b) 29%
c) 71%
d) 77%

2. Reappearance of high and low tides every day is called
a) Bimodal
b) Unimodal
c) Diurnal
d) Semi-neapal

3. Threats to oceanic biodiversity
a) Endemic phyta
b) Nuclear waste
c) Human harvest of zooplanktons
d) Both 2 and 3

4. Do Salt marshes support high levels of species diversity? State true or false
a) True
b) false

5. Approximately what percentage of today’s atmosphere is oxygen available?
a) 1%
b) 15%
c) 13%
d) 21%

6. Which of the following gas have a shielding effect on Ultra violet radiation?
a) Ozone
b) Carbon monoxide
c) Carbon dioxide
d) Oxygen

7. Miller-Urey original mixture does not contain ______
a) oxygen
b) nitrogen
c) carbon
d) phosphorus

8. The oldest fossils found in
a) Harappan Era
b) Archean Era
c) Cambrian Period
d) Proterozoic Era

9. According to the Scientist first molecules formed as life evolved were
a) proteins
b) RNA
c) Nucleic acid
d) None

10. Microfossils are the earliest organisms which resemble the present day spirochetes
a) True
b) False