Q1.
The term ecosystem was coined by
Q2.
Which one of the following is a characteristic feature of cropland ecosystem?
Q3.
Vertical distribution of different species occupying different levels in a biotic community is known as
Q4.
Which one of the following is not a functional unit of an ecosystem?
Q5.
Which one of the following is one of the characteristics of a biological community?
Q6.
Which of the following is the most stable ecosystem?
Q7.
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
Q8.
The mass of living material at a trophic level at a particular time is called
Q9.
In an ecosystem the rate of production of organic matter during photosynthesis is termed as
Q10.
Secondary productivity is rate of formation of new organic matter by
Q11.
The rate of formation of new organic matter by rabbit in a grassland, is called
Q12.
Mass of living matter at a trophic level in an area at any time is called
Q13.
The biomass available for consumption by the herbivores and the decomposers is called
Q14.
Which one of the following ecosystem types has the highest annual net primary productivity?
Q15.
Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem?
Q16.
The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's
Q17.
Which of the following ecosystem has the highest gross primary productivity?
Q18.
Maximum solar energy is trapped by
Q19.
Which one of the following processes during decomposition is correctly described?
Q20.
The breakdown of detritus into smaller particles by earthworm is a process called
Q21.
The slow rate of decomposition of fallen logs in nature is due to their
Q22.
Plant decomposers are
Q23.
Which of the following acts as nature's scavengers?
Q24.
If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because
Q25.
The primary producers of the deep-sea hydrothermal vent ecosystem are
Q26.
Most animals that live in deep oceanic waters are
Q27.
If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? Plant → Mice → Snake → Peacock
Q28.
Which of the following is a primary consumer in maize field ecosystem?
Q29.
When man eats fish which feeds on zooplanktons which have eaten small plants, the producer in this chain is
Q30.
Identify the possible link "A" in the following food chain.
Plant → Insect → Frog → "A" → Eagle
Q31.
Identify the likely organisms (1), (2), (3) and (4) in the food web shown below.
Q32.
Of the total incident solar radiation the proportion of PAR is
Q33.
Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
Q34.
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
Q35.
Consider the following statements concerning food chains.
A. Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
B. Removal of most of the carnivores resulted in an increased population of deers.
C. The length of food chains is generally limited to 3-4 trophic levels due to energy loss.
D. The length of food chains may vary from 2 to 8 trophic levels.
Which two of the above statements are correct?
Q36.
Bamboo plant is growing in a fir forest then what will be the trophic level of it?
Q37.
Which is the reason for highest biomass in aquatic ecosystem?
Q38.
Energy transfer from one trophic level to other, in a food chain, is
Q39.
In a terrestrial ecosystem such as forest, maximum energy is in which trophic level?
Q40.
The 10% energy transfer law of food chain was given by
Q41.
In a biotic community, the primary consumers are
Q42.
The dominant second trophic level, in a lake ecosystem, is
Q43.
Food chain in which microorganisms breakdown the food formed by primary producers is
Q44.
Pick up the correct food chain.
Q45.
Upper part of sea/aquatic ecosystem contains
Q46.
What is true of ecosystem?
Q47.
In an ecosystem, which one shows one-way passage?
Q48.
Match the trophic levels with their correct species examples in grassland ecosystem.
(A) Fourth trophic level (i) Crow
(B) Second trophic level (ii) Vulture
(C) First trophic level (iii) Rabbit
(D) Third trophic level (iv) Grass
Select the correct option.
Q49.
Which of the following ecological pyramids is generally inverted?
Q50.
What type of ecological pyramid would be obtained with the following data?
Secondary consumer: 120 g
Primary consumer: 60 g
Primary producer: 10 g
Q51.
Which ecosystem has the maximum biomass?
Q52.
Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?
Top: 1
SC: 10
PC: 50
PP: 500
Q53.
The upright pyramid of number is absent in
Q54.
Which one of the following statements for the pyramid of energy is incorrect?
Q55.
Which of the following representations shows the pyramid of numbers in a forest ecosystem?
Q56.
Which one of the following is not used for construction of ecological pyramids?
Q57.
Pyramid of numbers deals with number of
Q58.
Pyramid of numbers in a pond ecosystem is