UPSC Prelims Marathon 18 August - Marine organism

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Dear Friends,

We are posting prelims marathon MCQs for today. In this initiative, you can attempt 10 subjectwise MCQs daily. Daily Quiz UPSC Prelims Marathon 18 August Marine organism

For schedule, refer to the archive link given below. Best UPSC institute In Delhi,

For the Prelims Marathon archive – click here,

Start Quiz

Marking Pattern

Correct Answer : 2

Wrong Answer : -0.66

Answered

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Marked For Review

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CHOOSE A QUESTION

Time Left :5

Question No. 1

Consider the following statements about Plankton:
1.Plankton includes both microscopic plants (phytoplankton) and microscopic animals (zooplankton).
2.The distribution of plankton in aquatic ecosystems is primarily controlled by water currents rather than their own locomotion.
Which of the statements given above is/are correct?

A1 only

B2 only

CBoth 1 and 2

DNeither 1 nor 2

Question No. 2

With reference to Phytoplankton, consider the following statements:
1.Phytoplankton include bacteria, protists, and single-celled plants.
2.Phytoplankton are confined only to tropical and temperate oceans, being absent in polar waters.
3.Phytoplankton form the base of aquatic food chains and serve as the “pasture grounds” of oceans.
Which of the statements given above is/are correct?

A1 and 2 only

B1 and 3 only

C2 and 3 only

D1, 2 and 3

Question No. 3

With reference to Zooplankton, consider the following statements:
1.They play a vital role in nutrient recycling and the transfer of organic matter from phytoplankton to higher consumers.
2.Zooplankton abundance is generally higher in mangrove waterways compared to adjacent coastal waters.
3.The diversity and quality of zooplankton are indicators of fishery productivity and ecosystem health.
How many of the statements given above is/are correct?

A1 only

B2 only

CAll three

DNone

Question No. 4

Which of the following are common kinds of Phytoplankton?
1.Cyanobacteria
2.Diatoms
3.Dinoflagellates
4.Green algae
5.Coccolithophores
Select the correct answer using the code below:

A1, 2 and 3 only

B2, 3 and 4 only

C1, 2, 3, 4 and 5

D1, 4 and 5 only

Question No. 5

With reference to plankton in tropical waters, consider the following statements:
1.Mangrove waters show relatively high growth rates, productivity, and species diversity of plankton.
2.Plankton is entirely absent in swift-moving waters like rapids and fast streams.
Which of the statements given above is/are correct?

A1 only

B2 only

CBoth 1 and 2

DNeither 1 nor 2

Question No. 6

Consider the following statements:
Statement I: Seagrasses are the only group of higher plants fully adapted to life in salt water.
Statement II: They thrive mainly in shallow coastal waters with sandy or muddy bottoms, where salinity is high, water is clear, and currents are relatively calm.
Options:

ABoth Statement I and Statement II are correct, and Statement II is the correct explanation of Statement I.

BBoth Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

CStatement I is correct, but Statement II is incorrect.

DStatement I is incorrect, but Statement II is correct.

Question No. 7

With reference to Seaweeds, consider the following statements:
1.Seaweeds are macroscopic algae (thalloid plants) without differentiation into true roots, stems, and leaves.
2.They are commonly found attached to rocks, corals, and other submerged strata in intertidal and shallow subtidal zones.
Which of the statements given above is/are correct?

A1 only

B2 only

CBoth 1 and 2

DNeither 1 nor 2

Question No. 8

With reference to Phytoplankton, consider the following statements:
1.They are the primary producers in aquatic food webs, feeding organisms from zooplankton to large whales.
2.Phytoplankton are responsible for transferring carbon dioxide from the atmosphere to the ocean through photosynthesis.
3.The “biological carbon pump” operated by phytoplankton transfers about 60 gigatonnes of carbon annually to the deep ocean.
How many of the statements given above is/are correct?

AOne only

BTwo only

CAll three

DNone

Question No. 9

With reference to Bioluminescence, consider the following statements:
1.It is mainly produced by microscopic plankton called dinoflagellates, though it is also widespread among deep-sea animals.
2.The light emission results from a reaction between the enzyme luciferase and the compound luciferin in the presence of oxygen.
3.The phenomenon is confined only to tropical oceans and cannot be observed in Indian waters.
Which of the statements given above is/are correct?

A1 and 2 only

B2 only

C1 and 3 only

D1, 2 and 3

Question No. 10

With reference to Mosura fentoni, consider the following statements:
1.It is a newly discovered extinct marine species from the Cambrian period, around 506 million years ago.
2.Its fossils were discovered in the Burgess Shale formation of British Columbia, Canada.
3.It belongs to the group Radiodonta, stem-group arthropods distantly related to modern insects, crustaceans, and arachnids.
Which of the statements given above is/are correct?

A1 and 2 only

B2 and 3 only

C1 and 3 only

D1, 2 and 3

Total Number of Questions :

Total Not Attempted Questions :

Total Correct :

Total Wrong :

For schedule, refer to the archive link given below. Best UPSC institute In Delhi,

For the Prelims Marathon archive – click here,

Marking Pattern

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Question No. 4

Question No. 5

Question No. 6

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