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Ecosystem · Question 79

AIPMT 2000MCQHard📈 Topic in 50% papers+4−1
1

Which is the reason for highest biomass in aquatic ecosystem?

  1. Benthonic and brown algae
  2. Nanoplankton, blue green algae, green algae
  3. Diatoms
  4. Sea grass and slime moulds

Answer

(1) Benthonic and brown algae

Solution

The benthic region is the sea floor from the shore line to the deepest waters.

⇒ Its shallow, lighted part (littoral zone) receives abundant light, oxygen and CO2, so dense benthic vegetation grows there.

⇒ Large brown algae (kelps) of this zone form the bulkiest standing crop of plants in water.

∴ The benthic and brown algae account for the highest biomass in the aquatic ecosystem.

Answer: (1)

AIPMT 2000

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2

Match List I with List II :

  1. A-III, B-II, C-I, D-IV
  2. A-IV, B-III, C-I, D-II
  3. A-I, B-II, C-III, D-IV
  4. A-III, B-IV, C-II, D-I
NEET (UG) 2026
3

Match List I with List II :

  1. A-III, B-I, C-II, D-IV
  2. A-I, B-II, C-III, D-IV
  3. A-III, B-I, C-IV, D-II
  4. A-I, B-III, C-IV, D-II
NEET (UG) 2026
4

Ecological pyramids represent the relationship between the organisms at different trophic levels and they are generally inverted for :

  1. Pyramid of number in grassland
  2. Pyramid of energy in pond ecosystem
  3. Pyramid of biomass in grassland
  4. Pyramid of biomass in sea
NEET (UG) 2026
5

Which of the following are primary consumers in a food chain?

  1. Carnivores
  2. Parasites
  3. Predators
  4. Herbivores
RE-NEET (UG) 2026
6

Which of the following statements are correct?

  1. B and C only
  2. A, B and C
  3. A and B only
  4. A and C only
RE-NEET (UG) 2026
7

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Statement I is correct but statement II is incorrect
  2. Statement I is incorrect but statement II is correct
  3. Both statement I and statement II are correct
  4. Both statement I and statement II are incorrect
NEET (UG) 2025
8

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Statement I is correct but statement II is incorrect
  2. Statement I is incorrect but statement II is correct
  3. Both statement I and statement II are correct
  4. Both statement I and statement II are incorrect
NEET (UG) 2025
9

Which of the following is the unit of productivity of an Ecosystem?

  1. kcal m-3
  2. (kcal m-2) yr-1
  3. g m-2
  4. kcal m-2
NEET (UG) 2025
10

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x ( kcal m-2 ) yr-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

  1. x10 ( kcal m-2 ) yr-1
  2. x ( kcal m-2 ) yr-1
  3. 10x ( kcal m-2 ) yr-1
  4. 100x3x ( kcal m-2 ) yr-1
NEET (UG) 2024
11

Consider the pyramid of energy of an ecosystem given below: [figure] If T4 is equivalent to 1000 J, what is the value at T1 ?

  1. 1000010 J
  2. 1000010 4 J
  3. 10,000 J
  4. 10,00,000 J
RE-NEET (UG) 2024

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