Environment & Biodiversity MCQs
Environment, Ecology & Biodiversity Multiple choice questions for GK paper in SSC, NDA, CDS, UPSC, UPPSC and State PSC Examinations.
21. For the biomagnification of a particle to occur which of the following conditions should exist?
[A] Water soluble
[B] Short- lived
[C] Biologically active
[D] Immobile
Show Answer
Correct Answer: C [Biologically active]
Notes:
Biomagnification refers to the tendency of pollutant to concerntrate as they move from one trophic level to another. For biomagnification to take place a particle should be biologically active and mobile so that it can move to the higher level, it should be long-lived and soluble in fat.
22. Ramsar convention is related to which of the following-
[A] Limiting the desertification
[B] Conservation of wetlands
[C] Conservation of Snow Leopard
[D] Conservation of Tigers
Show Answer
Correct Answer: B [Conservation of wetlands]
Notes:
Ramsar convention signed in 1971 in Ramsar, Iran is related to the wise use and conservation of notified wetlands. From India there are 38 wetland sites recognized in the convention.
23. This group of organisms aquatic ecosystem are swimmers and are large and powerful to overcome the ocean currents. Which of the following are those group of organisms?
[A] Neuston
[B] Periphyton
[C] Benthos
[D] Nekton
Show Answer
Correct Answer: D [Nekton]
Notes:
Nektons contain those aquatic organisms that are swimmers. Nektons generally have large bodies and are powerful to overcome the ocean currents. They are of different ranges i.e form swimmer insects to large blue whales.
24. Tropical rain forests –
[A] Does not shed leaves
[B] Have a particular leaves’ shedding period
[C] Shed leaves but does not have particular season
[D] Shed leaves twice in a year
Show Answer
Correct Answer: C [Shed leaves but does not have particular season]
Notes:
Tropical rain forest occur near the equator and are marked by high temperature and rainfall. Thus flora is diversified and rich. Because of almost perennial presence of humidity the trees shed leaves but does not have a particular shedding period.
25. These forests are categorized by the moderate climate, trees having particular leaves shedding season, podozolic soil and fairly uniform rainfall. Which among the following is that type of forest?
[A] Tropical Deciduous
[B] Temperate Deciduous
[C] Tropical Rainforest
[D] Boreal forest
Show Answer
Correct Answer: B [Temperate Deciduous]
Notes:
The Temperate Deciduous forests are characterized by moderate climate, broad leaf deciduous trees, trees having particular shedding season. The rainfall is fairly uniform and soil is podozolic.
26. Which of the following can can categorised as the point source of water pollution?
- Oil spill in sea form ship
- Discharge from houses connected to public sewerage system
- Drains
- Nuclear Reactors
Select the correct answer form the codes given below-
[A] 1,2,3,4
[B] 1,3 and 4 only
[C] 1, 2 and 4 only
[D] 1,2 and 3 only
Show Answer
Correct Answer: B [1,3 and 4 only]
Notes:
Point sources of water pollution are those sources which are identifiable and thus easily controlled. Since drains, oil spill from ships and release form nuclear reactor can be easily identified so they are point source of water pollution.
27. Which of the following components are considered as the Abiotic components?
1) Non-green plants
2) Symbionts
3) Water
Select the correct answer from the codes given below:
[A] Only 1
[B] Only 2
[C] Only 1 & 3
[D] Only 3
Show Answer
Correct Answer: D [Only 3]
Notes:
The environment around us is not static. Both biotic and abiotic factors are in flux and keeps changing continuously. Some of the Abiotic components are Energy, Radiation, Temperature & heat flow, Water, Atmospheric gases and wind, etc
28. Ecosystems can be divided into which of the following scales?
1) Micro
2) Messo
3) Biome
Select the correct answer from the codes given below:
[A] Only 1 & 2
[B] Only 1 & 3
[C] Only 2 & 3
[D] 1, 2 & 3
Show Answer
Correct Answer: D [1, 2 & 3]
Notes:
Ecosystems exist in indefinite Sizes and can be divided into three main scales:
1) Micro- A small scale ecosystem such as Pond, Puddle, etc.
2) Messo- A medium Scale ecosystem such as a big lake, forest, etc.
3) Biome- A very large Ecosystem or collection of ecosystems.
29. In which of the following type of biotic interaction one species benefits and the other is harmed?
[A] Commensalism
[B] Predation
[C] Amensalism
[D] Competition
Show Answer
Correct Answer: B [Predation]
Notes:
In predation and parasitism one species benefits whereas the other is harmed. Some examples of predator and prey are lion and zebra, bear and fish, and fox and rabbit.
30. Which of the following are organisms which remain attached to stems and leaves of rooted plants or substances emerging
above the bottom mud such as sessile algae?
[A] Nekton
[B] Plankton
[C] Periphyton
[D] Neuston
Show Answer
Correct Answer: C [Periphyton]
Notes:
Periphyton are organisms which remain attached to stems and leaves of rooted plants or substances emerging above the bottom mud. The examples include sessile algae and their associated group of animals.
