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Shankar IAS Test: Aquatic Ecosystem- 1 - UPSC MCQ


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10 Questions MCQ Test Famous Books for UPSC Exam (Summary & Tests) - Shankar IAS Test: Aquatic Ecosystem- 1

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Shankar IAS Test: Aquatic Ecosystem- 1 - Question 1

These are organisms which remain attached to stems and leaves of rooted plants or substances emerging above the bottom mud such as sessile algae and their associated group of animals. These are:

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 1

Aquatic Organisms: The aquatic organisms are classified based on their zone of occurrence and their ability to cross these zones. The organisms (both flora and fauna) in the aquatic ecosystem are unevenly distributed.

Periphyton: These are organisms which remain attached to stems and leaves of rooted plants or substances emerging above the bottom mud such as sessile algae and their associated group of animals.

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 2

Consider the following statements about the Photic zone:

1. It is the lighted and usually well-mixed portion that extends from the lake surface down to where the light level is 1% of that at the surface.

2. Respiration activity takes place.

3. The depth of this zone depends on the transparency of water.

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 2

Photic zone:

  • It is the upper layer of the aquatic ecosystems, up to which light penetrates and within which photosynthetic activity is confined.

  • The depth of this zone depends on the transparency of water.

  • Both photosynthesis and respiration activity takes place.

  • The Phototic (or “euphotic”) zone is the lighted and usually well-mixed portion that extends from the lake surface down to where the light level is 1% of that at the surface.

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Shankar IAS Test: Aquatic Ecosystem- 1 - Question 3

Consider the following statements:

1. The water temperature changes more rapidly than the temperature of the air.

2. Larger amounts of heat energy must be added to or taken away from water to raise or lower its temperature.

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 3
  • The water temperature changes less rapidly than the temperature of air because water has a considerably higher specific heat than air, i.e. larger amounts of heat energy must be added to or taken away from water to raise or lower its temperature.

  • Since water temperatures are less subject to change, the aquatic organisms have narrow temperature tolerance limit.

 

 

 

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 4

Which of the following are correctly matched:

1. Oligotrophic - very high nutrients

2. Mesotrophic - moderate nutrients

3. Eutrophic - very low nutrients

Which of these statements are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 4
  • Lakes are also classified based on their water chemistry. Based on the levels of salinity, they are known as Freshwater, Brackish or Saline lakes (similar to that of classification of the aquatic ecosystem).

  •  An oligotrophic lake or water body is one which has a relatively low productivity due to the low nutrient content in the lake.

  • Eutrophic lake: a lake with high productivity, high nutrients and with dark water. The water is usually not good for drinking purpose.

  •  Vast majority of lakes in India are either eutrophic or mesotrophic because of the nutrients derived from their surroundings or organic wastes entering them.

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 5

Consider the following statements about the Point Sources of Pollution:

1. Directly attributable to one influence.

2. In point source nutrient waste travels directly from source to water.

3. Point sources are difficult to regulate.

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 5
Point source: Directly attributable to one influence; In point source nutrient waste travels directly from source to water; Point sources are easy to regulate.

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 6

Consider the following statements about the effects of eutrophication:

1. Affects navigation due to decreased turbidity

2. Increased biomass of inedible toxic phytoplankton

3. Increase in the bloom of gelatinous zooplankton

4. Increase the biomass of benthic and epiphytic algae

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 6
  • Eutrophication eventually creates a detritus layer in the ponds & lakes and produces a successively shallower depth of surface water.

  • Eutrophication may cause the ecosystem to become competitive by transforming the normal limiting nutrient to an abundant level. This causes shifting in species composition of ecosystem Toxicity.

  • A decrease in water transparency and increased turbidity. • Affects navigation due to increased turbidity.

  • Increased biomass of inedible toxic phytoplankton.

  • Increase in the bloom of gelatinous zooplankton

  • Increased biomass of benthic and epiphytic algae

  • Unsuitable for aesthetic recreation, and reduction in the value of water body

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 7

Which of the following can help to mitigate the effects of eutrophication?

1. Nitrogen testing

2. Organic farming & Integrated Farming System

3. Nutrient enrichment of water

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 7
  • Nitrogen testing & modelling

  • N-Testing is a technique to find the optimum amount of fertilizer required for crop plants.

  • It will reduce the amount of nitrogen lost to the surrounding area.

  • Treatment of Industrial effluents

  • Organic farming & Integrated Farming System.

  • Reduction in livestock densities

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 8

The National Lake Conservation Programme (NLCP) considers lakes as standing water bodies which:

1. Have a minimum water depth of 3 m,

2. Generally cover a water spread of more than ten hectares

3. Have no or very little aquatic vegetation

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 8
Although the Ministry of Environment and Forests has not adopted a clear distinction between lakes and wetlands, the National Lake Conservation Programme (NLCP) considers lakes as standing water bodies which have a minimum water depth of 3 m, generally cover a water spread of more than ten hectares, and have no or very little aquatic vegetation (macrophytes).

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 9

Consider the following characteristics of the estuary ecosystem:

1. It has a free connection with open sea

2. An estuary has very little wave action, so it provides a calm refuge from the open sea

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 9
An Estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it.
  • It has a free connection with the open sea.

  • The complete salinity range from 0-35 ppt is seen from the head (river end) to the mouth (see end) of an estuary.

  • An estuary has very little wave action, so it provides a calm refuge from the open sea.

  • It provides the shelter for some of the animals.

Shankar IAS Test: Aquatic Ecosystem- 1 - Question 10

Consider the following statements:

1. Mangroves of Bhitarkanika is the largest in the Indian subcontinent

2. Harbour high mangroves found in Gulf of Kachchh

Which of these statements is/are correct?

Detailed Solution for Shankar IAS Test: Aquatic Ecosystem- 1 - Question 10
  • The mangroves of Sundarbans are the largest single block of tidal halophytic mangroves of the world.

  • The mangroves of Bhitarkanika (Orissa), which is the second largest in the Indian subcontinent, harbour high mangroves found in Gulf of Kachchh, to taller stands found in the Sunderbans.

  • On the Andaman & Nicobar Islands, the small tidal estuaries, neritic inlets and the lagoons support a dense and diverse undisturbed mangrove flora.

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