Ecology

Total Questions: 88

71. The area that acts as a boundary or a transition zone between two ecosystem is known as [M.P.P.C.S. (Pre), 2022]

Correct Answer: (d) Ecotone
Solution:The area that acts as a boundary or a transition zone between two ecosystem is known as Ecotone. The recognition of a transition zone between two ecological system by Clements could be called the beginning of ecotone research.

Ecosphere: This is a broader term that refers to the entire area on and around the Earth where life exists, encompassing all living organisms and their environment.

Ecoboundary: While "ecoboundary" might seem to fit, it's not a standard scientific term. "Ecotone" is the more established term for a boundary or transition zone between ecosystems.

Ecotwin: This is a term used in the context of Applied Materials, referring to a digital twin platform for energy and chemical consumption in semiconductor manufacturing. It is not related to the concept of a transition zone between ecosystems.

72. The transitional zone between two distinct communities is known as : [U.P.P.C.S. (Pre) 2012 ]

Correct Answer: (d) Ecotone
Solution:Ecotype: An ecotype is a group of organisms within a species that are adapted to local environmental conditions through natural selection. They can have distinct morphological or physiological traits that allow them to survive in a particular habitat.

Ecotone: An ecotone is the transitional zone between two different ecosystems or communities, where species from both ecosystems can be found. Examples include marshlands between a river and its bank, or the boundary between a forest and a grassland.

Ecosphere: The term "ecosphere" can refer to a sealed, self-sustaining ecosystem in a glass jar or bottle, or it can be used to describe the biosphere as a whole.

Arcade: An arcade is a covered walkway, often lined with shops, and is not directly related to ecological concepts.

73. A transition zone between two biological communities is referred to as : [Uttarakhand P.C.S. (Pre) 2021]

Correct Answer: (b) Ecotone
Solution:Ecotype: An ecotype is a group of organisms within a species that are adapted to local environmental conditions through natural selection. They can have distinct morphological or physiological traits that allow them to survive in a particular habitat.

Ecotone: An ecotone is the transitional zone between two different ecosystems or communities, where species from both ecosystems can be found. Examples include marshlands between a river and its bank, or the boundary between a forest and a grassland.

Ecosphere: The term "ecosphere" can refer to a sealed, self-sustaining ecosystem in a glass jar or bottle, or it can be used to describe the biosphere as a whole.

Arcade: An arcade is a covered walkway, often lined with shops, and is not directly related to ecological concepts.

74. example of Lotic ecosystem is - [U.P.P.C.S. (Pre) 2023]

Correct Answer: (c) Rivers
Solution:Lotic ecosystems are characterized by flowing waters. Examples include rivers, streams, brooks and springs. Here, the oxygen level is higher due to the continually moving waters of the current and the water is clearer. The flow of the water is different depending on the area of a river or stream. Lentic ecosystems are those whose water is still, and are made up of ponds, marshes, ditches, lakes and swamps. These ecosystems range in size from very small ponds or pools that may be temporary to large lakes.

75. Which of the following is the most stable ecosystem? [U.P.P.C.S. (Pre) 2013]

Correct Answer: (c) Ocean
Solution:Oceans are the cradle of life on Earth which harbours the highest level of biodiversity. No terrestrial ecosystem can match the biological richness of a coral reef, not only in some species but also in variety and originality of survival strategies.

The oceans are thought to have been the environment where life first emerged on Earth. Oceans cover over 70% of the Earth's surface and contain a significant portion of the planet's water and habitable space.

Certain regions, like coral reefs and the Coral Triangle, are known for their incredibly high biodiversity, supporting a vast array of marine life. Oceans play a crucial role in regulating the Earth's climate, producing oxygen, and supporting human livelihoods through fishing, tourism, and transportation.

76. Most stable Ecosystem is - [R.A.S./R.T.S. (Pre) 2008]

Correct Answer: (d) Ocean
Solution:Oceans are the cradle of life on Earth which harbours the highest level of biodiversity. No terrestrial ecosystem can match the biological richness of a coral reef, not only in some species but also in variety and originality of survival strategies.

The oceans are thought to have been the environment where life first emerged on Earth. Oceans cover over 70% of the Earth's surface and contain a significant portion of the planet's water and habitable space.

Certain regions, like coral reefs and the Coral Triangle, are known for their incredibly high biodiversity, supporting a vast array of marine life. Oceans play a crucial role in regulating the Earth's climate, producing oxygen, and supporting human livelihoods through fishing, tourism, and transportation.

77. Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity? [I.A.S. (Pre) 2013, U.P.R.O./A.R.O. (Pre) 2021]

Correct Answer: (c) Mangroves, grasslands, lakes, oceans
Solution:The correct sequence of ecosystems in the order of decreasing productivity is - Mangroves, grasslands, lakes, oceans.

Mangroves: These coastal ecosystems are highly productive due to their location, abundant sunlight, and nutrient-rich environments.

Grasslands: Grasslands also exhibit high productivity, supporting a diverse range of herbivores.

Lakes: Lakes have moderate productivity, relying on external sources of nutrients and sunlight.

Oceans: Oceans, particularly the open ocean, have the lowest productivity due to their vast size, nutrient-poor waters, and limited sunlight penetration.

78. Who of the following used the term 'deep ecology' for the first time? [U.P.P.C.S. (Mains) 2014]

Correct Answer: (d) Arne Naess
Solution:Deep ecology is an environmental philosophy and social movement. In 1972, the Norwegian philosopher Arne Naess use this term along with American environmentalist George Sessions.It argues that the natural world is a subtle balance of complex interrelationships in which the existence of an organism is dependent on the existence of others within the ecosystem. Deep Ecology consists of two words Deep and Ecology. Deep as it looks deeply into the actual reality of human relationship with the whole natural world which is more conclusive than that of the prevailing view of ecology as a branch of "Biology'. The world does not exist as a resource to be freely exploited by humans except to meet basic human needs, humans have no authority to limit diversity.It aims at conserving and saving nature for the inherent aim of maintaining and conserving the environment.

79. The Monoclimax theory was propounded by - [U.P.R.O./A.R.O. (Pre) 2021]

Correct Answer: (a) F.E. Clements
Solution:Monoclimax was propounded by F.E. Clement. According to the mono-climax theory of succession (Clements, 1936), every region has one climax community toward which all communities are developing. He believed that climate was the determining factor for vegetation and the climax of any area was solely a function of its climate.

80. The concept of the ecological niche was enunciated by - [U.P.P.C.S. (Pre) 2005]

Correct Answer: (a) Grinnell
Solution:Joseph Grinnell referred to the "ecological or environmental niche" as the ultimate distributional unit of "species and subspecies". An ecological niche refers to a species' specific role or position within its ecosystem. It includes the conditions created by both living (biotic) and non-living (abiotic) elements of the ecosystem that affect the species' ability to reproduce and obtain essential resources like food, water, and shelter. Additionally, a niche encompasses the impact the species has on its ecosystem.

An ecological niche is the role and position of a species in its environment, describing how it interacts with resources and competitors and how it affects these factors. It includes how a species grows when resources are abundant and threats are minimal and how it competes for resources, serves as prey, and hunts for food.

A species' niche depends on biotic factors like food and predators and abiotic factors such as temperature, soil nutrients, and light. For example, dung beetles eat dung and store it for their larvae, which helps recycle nutrients and aerate the soil.