Assertion :Aquatic herbivores are usually more productive as compared to terrestrial herbivores. Reason: Phytoplanktons achieve faster growth rate and are more nutritious to heterotrophs than their terrestrial counterparts due to their small size and lack of structural tissues.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Most plant material is not consumed or is not digested by terrestrial herbivores, because plants have so much structural material. Most algal material (phytoplanktons) is consumed and digested by aquatic herbivores, because algae have very little structural material. Moreover, photoplanktons turn over much more rapidly than terrestrial plants, so biomass at any given time is low as compared to the productivity. Phytoplanktons grow and reproduce rapidly, so a small mass can have a faster rate of primary production. In contrast, terrestrial primary producers grow and reproduce slowly. Thus, terrestrial herbivores are less productive than aquatic herbivores.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Similar questions

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

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can be derived from Van der Waal's equation.

Assertion (A) p-nitrophenol is more acidic than phenol.
Reason (R) Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. With regard to the assertion and reason, choose the correct option:
Assertion [A]: Inhabitants close to very busy airports are likely to experience health hazards.
Reason [R]: Sound levels of jet planes usually exceed 150 dB.

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