Plant Biology Science Free online practice objective Questions

Plant Biology Science Free online practice objective Questions
Free Objective Science Plant Biology Tests Online Practice Test
Free Multiple Choice Question In Plant Biology and Science Online Practice Test
1. The pyramid of biomass is inverted in pond ecosystem
(a) pond ecosystem
(b) grassland ecosystem
(c) forest ecosystem
(d) all the above
Ans. (a)

2. Which of the following plays an important role in nitrogen cycle?
(a) Rhizopus
(b) Nitrobacter
(c) Mucor
(d) Spirogyra
Ans. (b)

3. World climate is threatened by increase in concentration of
(a) oxygen
(b) nitrogen
(c) water vapours
(d) carbon dioxide
Ans. (d)


4. Ten per cent law of energy transfer in a food chain was enunciated by
(a) Lindeman
(b) Haeckel
(c) Schimper
(d) Zernicke
Ans. (a)

5. Alluvial soils in India are
(a) found in desert
(b) least fertile
(c) very rare
(d) most extensive soils
Ans. (d)

6. Which of the following environments is richest in free oxygen?
(a) Warm fresh water
(b) Atmosphere
(c) Cold fresh water
(d) Salt water
Ans. (b)


7. Ultraviolet radiation from sunlight causes the reaction that produces
(a) SO2
(b) CO
(c) zone
(d) fluorides
Ans. (c)

8. From the following, which is the best source of renewable energy?
(a) Petroleum
(b) Coal
(c) forests
(d) Cattle
Ans. (c)

9. A depleting source of energy is
(a) wind
(b) sunlight
(c) water
(d) fossil fuels
Ans. (d)

10. The species, which are in danger of extinction, are referred to as
(a) endangered species
(b) vulnerable species
(c) threatened species
(d) rare species
Ans. (a)


11. When plant diversity is maintained in natural habitat the conservation is called
(a) in vivo
(b) in vitro
(c) ex situ
(d) in situ
Ans. (d)

12. An American plant that had become a troublesome waterweed in India is
(a) Trapa bispinosa
(b) Cyperus rotundus
(c) Eichhornia crassipes
(d) Typha latfolia
Ans. (c)

13. Carbon monoxide is a pollutant because it
(a) inhibits glycolysis
(b) combines with haemoglobin
(c) inactivates nerves
(d) combines with oxygen
Ans. (b)

14. Which of the following atmospheric pollutants does the exhaust of motor vehicles do
NOT produce?
(a) SO2
(b) Fly ash
(c) Hydrocarbon gases
(d) CO
Ans. (b)

15. Gas released during Bhopal tragedy was
(a) sodium isothiocyanate
(b) potassium isothiocyanate
(c) ethyl isothiocyanate
(d) dmethyl isocyanate
Ans. (d)

16. Terracing is an effective method of soil conservation in
(a) desert areas
(b) plain areas
(c) hill areas
(d) none of these
Ans. (c)

17. Which of the following serves as indicator of atmospheric pollution?
(a) Liverworts
(b) Hornworts
(c) Epiphytic lichens
(d) Ferns
Ans. (c)

18. DDT is
(a) non-degradable pollutant
(b) degradable pollutant
(c) green house gas
(d) none of these
Ans. (a)

19. Minamata disease is a pollution-related disease, which results from
(a) release of human organic waste into drinking water
(b) accumulation of arsenic into atmosphere
(c) release of industrial waste mercury into fishing water
(d) oil spills into sea
Ans. (c)

20. Mulching is a process that helps in
(a) weed control
(b) soil fertility
(c) moisture conservation
(d) improvement of soil structure
Ans. (c)