Science Quiz: Day: 95

Which of the following statements is correct regarding the Ecosystem?
1.An ecosystem is a functional unit where living organisms interact among themselves and also with the surrounding physical environment.
2. Vertical distribution of different species occupying different levels is called stratification.
Select the correct option from the codes given below:

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2

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ANSWER: C

Consider the following statements regarding different kinds of Ecosystem:
1. Grasslands rarely receive enough rain to support trees and does not possess enough soil nutrients to feed large, grassy expanses.
2. Tundra is the treeless environment of the Arctic Circle.
3. The taiga is a region of subarctic forest south of the Arctic Circle.
Which of the above statement/s is/are correct?

(A) 1 and 2 only
(B) 3 only
(C) 2 and 3 only
(D) 1 only

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ANSWER: C

With respect to productivity of an ecosystem, consider the following statements:
1. Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis.
2. Secondary productivity is defined as the rate of formation of new organic matter by producers.
Which of the above statement/s is/are incorrect?

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2

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ANSWER: B

Which o f the following statements in NOT correct regarding producers and consumers?

(A) In a terrestrial ecosystem, major producers are herbaceous and woody plants.
(B) If the animals eat other animals which in turn eat the plants (or their produce) they are called tertiary consumers.
(C) Primary consumers will always be herbivores.
(D) Those animals that depend on the primary carnivores for food are labelled secondary carnivores.

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ANSWER: B

Consider the following statements regarding the Energy Flow in an Ecosystem:
1. Except for the deep sea hydro-thermal ecosystem, sun is the only source of energy for all ecosystems on Earth.
2. At each step up the food chain, only 10 percent of the energy is passed on to the next level, while approximately 90 percent of the energy is lost as heat.
3. Of the incident solar radiation more than 50 percent of it is photosynthetically active radiation (PAR).
Which of the above statement/s is/are correct?

(A) 1 and 2 only
(B) 2 only
(C) 1 and 3 only
(D) 3 only

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ANSWER: A

Photosynthetically active radiation (PAR) is light of wavelengths 400-700 nm and is the part of the light spectrum used by plants for photosynthesis.
Of the incident solar radiation less than 50 percent of it is photosynthetically active radiation (PAR).
Plants capture only 2 – 10 % of PAR .

With respect to Ecological Pyramids, consider the following statements:
1. The pyramid of productivity is more accurate than the pyramid of numbers and pyramid of biomass.
2. The pyramid of biomass in sea is always inverted because the biomass of fishes far exceeds that of phytoplankton.
Which of the above statement/s is/are correct?

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2

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ANSWER: A

The pyramid of productivity looks at the total amount of energy present at each trophic level, as well as the loss of energy between trophic levels.
Since this type of representation takes into account the fact that the majority of the energy present at one trophic level will not be available for the next one, it is more accurate than the other two pyramids.

The movement of nutrient elements through the various components of an ecosystem is called nutrient cycling. Consider the following statements regarding the same:
1. The reservoir for gaseous type of nutrient cycle is located in Earth’s crust and for the sedimentary cycle, the reservoir exists in the atmosphere.
2. Unlike carbon cycle, there is no respiratory release of phosphorus into atmosphere.
Which of the above statement/s is/are correct?

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2

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ANSWER: B

Carbon is the foundation of all life on Earth, required to form complex molecules like proteins and DNA. Which of the following statements is/are correct regarding Carbon Cycle?
1. Because Earth is a closed system, the amount of carbon on the planet never changes.
2. Green carbon is the term for carbon captured by the world’s ocean and coastal ecosystems.
Select the correct option from the codes given below:

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 and 2

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ANSWER: A

Which of the following is/are the in-situ methods of conservation?
1. Biosphere Reserve
2. Community Reserve
3. National Parks
4. Seed Banks
Select the correct answer using the code given below:

(A) 1 and 3 only
(B) 1, 2 and 3 only
(C) 2 and 4 only
(D) 1 , 2 , 3 and 4

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ANSWER: B

Consider the following statements
1. National Parks enjoy a greater degree of protection than Wildlife Sanctuaries.
2. Wildlife Sanctuary can be created for a particular type of species.
3. The boundaries of a National Park can be altered by the State Legislature.
Which of the statements given above is/are correct?

(A) 1 only
(B) 1 and 2 only
(C) 3 only
(D) 1 , 2 and 3

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ANSWER: D

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