ECOSYSTEM CLASS 12 (NEET/CBSE) MCQ
1. GPP = ________
a. NPP b. NGP – R c. NGP + R d. None of these
2. Which one of the following has the largest population in a food chain?
a. Producers b. Primary consumers c. Secondary consumers d. Decomposers
3. The second trophic level in a lake is
a. Phytoplankton b. Zooplankton c. Benthos d. Fishes
4. Secondary producers are
a. Herbivores b. Producers c. Carnivores d. None of the above
5. What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation?
a. 100% b. 50 % c. 1-5% d. 2-10%
6. Which of the following is an ecosystem service provided by a natural ecosystem?
a. Cycling of nutrients b. Prevention of soil erosion
c. Pollutant absorption and reduction of the threat of global warming d. All of the above
7. The sequence of communities of primary succession in water is:
a. phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.
b. phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.
c. free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.
d. phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
8. PC (21)
P (4)
The following pyramid is correctly matched with
a. Zooplanktons supporting Phytoplankton b. Inverted pyramid of Energy
c. Pyramid of biomass d. All of these
9. If 500g of dead matter are source of food for 400g of decomposers, what net standing crop mass the dead matter
contributes
a. 100g b. 5/4g c. 200g d. None of these
10. Which of the following is possible in an aquatic ecosystem?
Pyramid of numbers Pyramid of biomass Pyramid of energy
a) Inverted Inverted Inverted
b) Upright Upright Upright
c) Inverted Inverted Inverted
d) Upright Inverted Upright
ANSWER KEY
1. GPP = ________
a. NPP b. NGP – R c. NGP + R d. None of these
2. Which one of the following has the largest population in a food chain?
a. Producers b. Primary consumers c. Secondary consumers d. Decomposers
3. The second trophic level in a lake is
a. Phytoplankton b. Zooplankton c. Benthos d. Fishes
4. Secondary producers are
a. Herbivores b. Producers c. Carnivores d. None of the above
5. What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation?
a. 100% b. 50 % c. 1-5% d. 2-10%
6. Which of the following is an ecosystem service provided by a natural ecosystem?
a. Cycling of nutrients b. Prevention of soil erosion
c. Pollutant absorption and reduction of the threat of global warming d. All of the above
7. The sequence of communities of primary succession in water is:
a. phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.
b. phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.
c. free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.
d. phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
8. PC (21)
P (4)
The following pyramid is correctly matched with
a. Zooplanktons supporting Phytoplankton b. Inverted pyramid of Energy
c. Pyramid of biomass d. All of these
9. If 500g of dead matter are source of food for 400g of decomposers, what net standing crop mass the dead matter
contributes
a. 100g b. 5/4g c. 200g d. None of these
10. Which of the following is possible in an aquatic ecosystem?
Pyramid of numbers Pyramid of biomass Pyramid of energy
a) Inverted Inverted Inverted
b) Upright Upright Upright
c) Inverted Inverted Inverted
d) Upright Inverted Upright
ANSWER KEY
