Question No:1
Unit of productivity is :
[A] gm-2yr-1
[B] Kcal/m2/year
[C] Both (a) and (b) . [D] None
Question No:2
NPP means:
[A] Available biomass for the consumption of heterotrophs
[B] Biomass produced by producers
[C] Gross primary product of respiratory losses [D] All of the above
Question No:3
The annual net primary productivity of the whole biosphere is how much billion tons (dry weight) of organic matter?
[A] 120
[B] 170
[C] 210 [D] 150
Question No:4
Oceans occupy ______ % of the surface of earth but productivity of ocean are ______ billion tons.
[A] 70,45
[B] 60,55
[C] 70, 55 [D] 60, 65
Question No:5
Productivity of ocean is less because:
[A] It occupies 70% of earth’s surface.
[B] Light is a major limiting factor which decreases with increase in water depth.
[C] It contains algae as a chief producer. [D] All of the above
Question No:6
What is the percentage of primary productivity of oceans?
[A] 50%
[B] 90%
[C] 32% [D] 70%
Question No:7
Earthworms help in:
[A] Breakdown of complex organic matter
[B] Loosening of soil
[C] Both (a) and (b) [D] None of the above
Question No:8
Detritus contain:
[A] Dead plant remains (leaves, bark and flower)
[B] Dead animal remains
[C] Fecal matter [D] All of the above
Question No:9
The important steps in the process of decomposition are:
[A] Fragmentation
[B] Leaching
[C] Catabolism [D] All of these
Question No:10
Match the columns:
Column-I—-Column-II
1)Fragmentation A. Break down of detritus into smaller particles
2)Leaching B. Precipitation of water soluble nutrients as unavailable salt
3) Catabolism C. Degradation of detritus by bacterial and fungal enzymes
[A] 1-A,2-B,3-C
[B] 1-B, 2-C, 3-A
[C] 1-C,2-B,3-A [D] 1-C,2-A, 3-B
Question No:11
Which of these are true about humus?
[A] Dark colored amorphous substance
[B] Colloidal in nature
[C] Reservoir of nutrient [D] All of the above
Question No:12
Humus is degraded by some microbes and release of inorganic nutrients occur by the process known as ______.
[A] Fragmentation
[B] Leaching
[C] Humidification [D] Mineralization
Question No:13
Find out total number of incorrect statements from the following:
(A) Decomposition is largely an anaerobic process.
(B) Fragmentation, leaching and Catabolism occur simultaneously on detritus.
(C) Vertical distribution of different species occupying different level is called stratification.
(D) Pond is a deep water body.
(E) The rate of decomposition is controlled by chemical composition of detritus and climatic factors.
[A] 1
[B] 2
[C] 3 [D] 4
Question No:14
Decomposition is favoured by:
[A] Warm and moist environment
[B] Rich amount of nitrogen and water soluble substance like sugar in detritus
[C] Aerobic environment [D] All of the above
Question No:15
Rate of decomposition process is decreased by:
[A] Aerobic environment
[B] Rich amount of lignin and chitin in detritus
[C] Worm and moist environment [D] All of the above
Ecosystem Mock Exam-2
CategoriesNEET Biology