OS Academy
Give your Civil Service Preparation an edge with our curated and structured resource...
Why us ?
* Team of highly qualified and experienced faculties
* Expertise in State Civil Service exam conducted by OPSC
* Student centered teaching method
* Dedicated doubt clearing sessions
* One to one mentorship sessions
* Continuous result since inception
Contact - 8249173360 (Feel free to WhatsApp)
Telegram - @askosacademy
Instagram - www.instagram.com/askosacademy/?hl=en
OS Academy
Keystone species are important because they:
(a) Are always top carnivores
(b) Have maximum population size
(c) Have a disproportionately large ecological impact
(d) Are found only in protected areas
3 days ago | [YT] | 5
View 0 replies
OS Academy
Which of the following ecosystems has the highest net primary productivity?
(a) Deserts
(b) Tropical rainforests
(c) Tundra
(d) Open oceans
4 days ago | [YT] | 5
View 1 reply
OS Academy
Ozone depletion in the stratosphere leads to:
(a) Increase in infrared radiation
(b) Increased UV-B radiation reaching Earth
(c) Rise in atmospheric pressure
(d) Enhanced greenhouse effect
Answer: (b)
Explanation: Ozone absorbs harmful UV-B radiation. Its depletion allows more UV-B to reach Earth, increasing risks of skin cancer, cataracts and damage to crops and marine life.
5 days ago | [YT] | 1
View 2 replies
OS Academy
Which of the following is a Ramsar Site criterion?
(a) High altitude location
(b) Importance for migratory waterbirds
(c) Presence of endemic mammals only
(d) Dense forest cover
6 days ago | [YT] | 3
View 0 replies
OS Academy
Which of the following statements about invasive species is correct?
(a) They always increase biodiversity
(b) They have no natural predators in new habitats
(c) They evolve only in islands
(d) They are always deliberately introduced
1 week ago | [YT] | 2
View 0 replies
OS Academy
Which of the following best defines “carrying capacity”?
(a) Total biomass of an ecosystem
(b) Maximum population size an environment can sustain
(c) Rate of population growth
(d) Resource availability at a given time
1 week ago | [YT] | 3
View 0 replies
OS Academy
In the nitrogen cycle, nitrification refers to:
(a) Conversion of nitrogen into ammonia
(b) Conversion of ammonia into nitrates
(c) Conversion of nitrates into nitrogen gas
(d) Absorption of nitrogen by plants
1 week ago | [YT] | 1
View 0 replies
OS Academy
Which of the following is NOT a greenhouse gas?
(a) Carbon dioxide
(b) Methane
(c) Nitrous oxide
(d) Sulphur dioxide
1 week ago | [YT] | 3
View 0 replies
OS Academy
Which of the following correctly explains “biological oxygen demand (BOD)”?
(a) Oxygen needed for respiration by aquatic animals
(b) Oxygen required to decompose organic matter
(c) Total dissolved oxygen in water
(d) Oxygen released by aquatic plants
1 week ago | [YT] | 1
View 1 reply
OS Academy
The main role of decomposers in an ecosystem is to:
(a) Transfer energy to higher trophic levels
(b) Convert inorganic nutrients into biomass
(c) Recycle nutrients back to the ecosystem
(d) Increase primary productivity
1 week ago | [YT] | 1
View 0 replies
Load more