MCQ on Ecosystem with Answer Pdf:
- As we know Ecosystems is the relationship between all living and nonliving things (plants, animals, organisms, sun, water, climate, etc) that interact with each other is called ecosystem.
- An ecosystem can be as small as a desert or as big as an ocean, spanning thousands of miles. There are two types of ecosystems, Terrestrial Ecosystem, Aquatic Ecosystem
- In ecosystems, the Producers are included in all autotrophic organisms such as plants. They are called autotrophs because they can produce their food through the process of photosynthesis. Consequently, all other organisms are called consumers because they rely on producers for food.
- Within an ecosystem, there are several types of consumers, which together form a food chain. The types of consumers are divided into:
- Primary consumers: These are the animals that feed on the producers, that is, the herbivorous species;
- Secondary consumers: These are animals that feed on herbivores, the first category of carnivorous animals
- Tertiary consumers: These are large predators such as sharks, killer whales, and lions, which capture large prey, being considered the top predators in the chain;
- Decomposers: These are the organisms responsible for decomposing organic matter, transforming it into mineral nutrients that become available again in the environment.
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MCQ on Ecosystem:
1. Ecosystem may be defined as MCQ?
(a) All organisms such as plants, animals, microorganisms, and human beings as well as the physical surroundings interact with each other and maintain a balance in nature.
(b) a biological community of interacting organisms and their physical environment.
(c) An ecosystem is a structural and functional unit of ecology where the living organisms interact with each other and the surrounding environment.
(d) All of These
2. An ecosystem consists of MCQ_________
(a) producers, consumers, and decomposers in a particular area.
(b) all the plants and animals of an area.
(c) a living community and its environment.
(d) carnivorous and herbivorous of an area
3. Which one of the following would appear as the pioneer organisms on bare rocks?
(a) Green algae
4. Secondary Succession takes place on/in_____
(a) Degraded forests
(b) Newly created pond
(c) Newly cooled lava
(d) Bare rocks
5. The natural reservoir of phosphorus is_______
(d) Animal bones
6. The second stage of hydrosere is occupied by plants like________
7. Which one of the following statements is correct for secondary succession?
(a) It is similar to primary succession except that it has a relatively fast pace.
(b) It begins on a bare rock.
(c) It occurs on a deforested site
(d) It follows primary succession.
8. What type of ecological pyramid would be obtained with the following data?
Secondary consumer: 120g,
Primary consumer: 60 g
Primary producer: 10 g.
(a) Upright pyramid of numbers
(b) Pyramid of energy
(c) Inverted pyramid of biomass
(d) Upright pyramid of biomass
9. Which ecosystem has the maximum biomass________
(a) Forest ecosystem
(b) Pond ecosystem
(c) Grassland ecosystem
(d) Lake ecosystem
10. If 20 J of energy is trapped at the producer level, then how much energy will be available to peacock as food in the following chain________
Plant > Mice > Snake > Peacock
(a) 0.02 J
(b) 0.2 J
(c) 0.002 J
(d) 0.0002 J
11. Of the total incident solar radiation the proportion of PAR is_______
(a) More than 80%
(b) About 60%
(c) About 70%
(d) Less than 50%
12. Presence of plants arranged into well-defined vertical layers depending on their height can be seen in______
(a) Tropical Savannah
(c) Tropical Rain Forest
(d) Temperate Forest
13. The term ecosystem was coined by_______
14. In an ecosystem the rate of production of organic matter during photosynthesis is termed as_________
(a) Net primary productivity
(b) Gross primary productivity
(c) Secondary productivity
(d) Net Productivity
15. Secondary productivity is the rate of formation of new organic matter by________
16. The breakdown of detritus into small particles by earthworms is a process called________
17. The biomass available for consumption by herbivores and decomposers is called_____
(a) Secondary productivity
(b) Standing crop
(c) Gross primary productivity
(d) Net primary productivity
18. Which one of the following statements for the pyramid of energy is incorrect, whereas the remaining three are correct___________
(a) It is upright in shape
(b) Its base is broad
(c) It shows the energy content of different trophic-level organisms
(d) It is inverted in shape
19. The mass of living matter at a trophic level in an area at any time is called______
(b) Standing crop
(c) Standing state
20. Which one occupies more than one trophic level in a pond ecosystem?
21. Pick up the correct statements regarding the food chain.
(i) Removal of 80 tigers resulted in greatly increased growth of vegetation
(ii) Removal of most of the carnivores resulted in an increased population of deer
(iii) Length of the food chain is generally limited to 3-4 trophic levels due to energy loss
(iv) Length of the food chain may vary from 2-8 trophic levels
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
22. The slow rate of decomposition of fallen logs is due to______________
(a) Poor nitrogen content
(b) Anaerobic environment
(c) Low cellulose content
(d) Low moisture content