| 51 |
The S-shaped (logistic) growth curve levels off when the population reaches: |
Environmental Studies
Population regulation |
Easy |
| 52 |
For a population with r = 0.2 per year, N = 200 and K = 1,000, what is the logistic growth rate dN/dt? |
Environmental Studies
Population regulation |
Hard |
| 53 |
J-shaped population growth is expected when: |
Environmental Studies
Population regulation |
Easy |
| 54 |
Which of these is a density-independent factor? |
Environmental Studies
Population regulation |
Medium |
| 55 |
In the logistic model, a population grows fastest when its size N is equal to: |
Environmental Studies
Population regulation |
Medium |
| 56 |
Which is considered the single largest cause of biodiversity loss worldwide? |
Environmental Studies
Threats to ecosystems |
Easy |
| 57 |
When farmers replace many local crop varieties with a few high-yielding varieties, the resulting loss of gene… |
Environmental Studies
Threats to ecosystems |
Medium |
| 58 |
Lantana and water hyacinth spreading in Indian forests and lakes are examples of: |
Environmental Studies
Threats to ecosystems |
Easy |
| 59 |
A parasite that can live only on one host species dies out when the host becomes extinct. This is called: |
Environmental Studies
Threats to ecosystems |
Medium |
| 60 |
Public protest in Kerala led to a planned hydroelectric project being dropped and the area becoming a nationa… |
Environmental Studies
Threats to ecosystems |
Hard |
| 61 |
The National Forest Policy of 1988 aims to bring what share of India’s land area under forest or tree cover? |
Environmental Studies
Forest conservation and conflicts |
Easy |
| 62 |
The law that recognises the land and forest-produce rights of tribal and traditional forest-dwelling communit… |
Environmental Studies
Forest conservation and conflicts |
Medium |
| 63 |
The Appiko movement, modelled on Chipko, took place in: |
Environmental Studies
Forest conservation and conflicts |
Medium |
| 64 |
In 1730, Amrita Devi and many members of her community gave their lives to protect khejri trees. The communit… |
Environmental Studies
Forest conservation and conflicts |
Easy |
| 65 |
According to the India State of Forest Report 2021, India’s forest cover was about what share of its geograph… |
Environmental Studies
Forest conservation and conflicts |
Hard |
| 66 |
The first Inspector General of Forests in British India was: |
Environmental Studies
Forest management |
Medium |
| 67 |
Planting trees along roadsides, canal banks and railway lines is called: |
Environmental Studies
Forest management |
Easy |
| 68 |
Joint Forest Management grew out of a successful experiment at: |
Environmental Studies
Forest management |
Medium |
| 69 |
The main aim of colonial “scientific forestry” was to: |
Environmental Studies
Forest management |
Easy |
| 70 |
Which statement correctly describes Joint Forest Management? |
Environmental Studies
Forest management |
Hard |
| 71 |
Which is an example of ex situ conservation? |
Environmental Studies
In situ and ex situ conservation |
Easy |
| 72 |
In a biosphere reserve, the zone where people live and carry out sustainable activities is the: |
Environmental Studies
In situ and ex situ conservation |
Medium |
| 73 |
India’s first national park, set up in 1936 as Hailey National Park, is now known as: |
Environmental Studies
In situ and ex situ conservation |
Easy |
| 74 |
Cryopreservation of genetic material is usually carried out at a temperature of about: |
Environmental Studies
In situ and ex situ conservation |
Medium |
| 75 |
How does a national park mainly differ from a wildlife sanctuary in India? |
Environmental Studies
In situ and ex situ conservation |
Hard |
| 76 |
Project Tiger was launched in India in: |
Environmental Studies
Project Tiger and conservation laws |
Easy |
| 77 |
Which law requires prior central government approval before forest land is diverted for non-forest purposes? |
Environmental Studies
Project Tiger and conservation laws |
Medium |
| 78 |
The National Biodiversity Authority, headquartered in Chennai, was set up under the: |
Environmental Studies
Project Tiger and conservation laws |
Medium |
| 79 |
The fundamental duty of citizens to protect and improve the natural environment is found in: |
Environmental Studies
Project Tiger and conservation laws |
Easy |
| 80 |
The All India Tiger Estimation 2022, released in 2023, gave an average estimate of about how many tigers in I… |
Environmental Studies
Project Tiger and conservation laws |
Hard |
| 81 |
Fertiliser-laden runoff from many farm fields entering a river is an example of a: |
Environmental Studies
Pollutants, sources and sinks |
Easy |
| 82 |
Minamata disease, first reported in Japan in the 1950s, was caused by poisoning with: |
Environmental Studies
Pollutants, sources and sinks |
Medium |
| 83 |
The increase in concentration of a persistent pollutant such as DDT at successive levels of a food chain is c… |
Environmental Studies
Pollutants, sources and sinks |
Easy |
| 84 |
The Central Pollution Control Board was first set up under which Act? |
Environmental Studies
Pollutants, sources and sinks |
Hard |
| 85 |
The Environment (Protection) Act, 1986 was passed soon after which disaster? |
Environmental Studies
Pollutants, sources and sinks |
Medium |
| 86 |
Which of these is a secondary air pollutant? |
Environmental Studies
Air pollution |
Easy |
| 87 |
The ozone layer lies mainly in the: |
Environmental Studies
Air pollution |
Easy |
| 88 |
Rain is considered “acid rain” when its pH falls below about: |
Environmental Studies
Air pollution |
Medium |
| 89 |
Photochemical smog differs from classical smog because it: |
Environmental Studies
Air pollution |
Hard |
| 90 |
A layer of warm air lying over cooler air near the ground, which traps pollutants, is called: |
Environmental Studies
Air pollution |
Medium |
| 91 |
India’s revised National Ambient Air Quality Standards (2009) cover how many pollutants? |
Environmental Studies
Air quality standards and monitoring |
Medium |
| 92 |
A city reports an AQI of 350. Its air quality falls in which category? |
Environmental Studies
Air quality standards and monitoring |
Easy |
| 93 |
The 24-hour NAAQS limit for PM2.5 is: |
Environmental Studies
Air quality standards and monitoring |
Hard |
| 94 |
Why is PM2.5 considered more harmful to health than coarser particles? |
Environmental Studies
Air quality standards and monitoring |
Medium |
| 95 |
How is the overall Air Quality Index for a location decided? |
Environmental Studies
Air quality standards and monitoring |
Easy |
| 96 |
India moved to BS-VI emission norms nationwide on 1 April 2020 by skipping: |
Environmental Studies
Vehicular and industrial emissions |
Easy |
| 97 |
Which device is mainly used in thermal power plants to remove fine particles from flue gases? |
Environmental Studies
Vehicular and industrial emissions |
Medium |
| 98 |
A catalytic converter in a petrol car requires unleaded fuel because lead: |
Environmental Studies
Vehicular and industrial emissions |
Medium |
| 99 |
The switch of Delhi’s buses, taxis and autorickshaws to CNG followed an order in 1998 by the: |
Environmental Studies
Vehicular and industrial emissions |
Easy |
| 100 |
What is the maximum sulphur content allowed in BS-VI fuel? |
Environmental Studies
Vehicular and industrial emissions |
Hard |