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BIOLOGY 1 Marks Question

Ecosystems · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 124 questions.

Questions · Page 3 of 3

1 Marks Question

Question 1011 Mark
Define ecological succession.
Answer
Ecological succession is a community controlled phenomenon, in which the structure and composition of communities change in an orderly and sequential manner, leading ultimately to the establishment of a climax community.
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Question 1021 Mark
Mark the odd one in the following group.
Phytoplanktons, Zooplanktons, Reed-swamp stage, Lichens.
Answer
Lichens.
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Question 1031 Mark
Name the two climatic factors that regulate decomposition.
Answer
Temperature and soil moisture are the two climatic factors that regulate decomposition.
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Question 1051 Mark
Why is the assimilation of energy at the herbivore level, called secondary productivity?
Answer
Herbivores are the primary consumers; the rate of assimilation or formation of new biomass at the consumer level is secondary productivity.
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Question 1061 Mark
What is common to earthworm, mushroom, soil mites and dung beetle in an ecosystem.
Answer
They are all detritivores, i.e., decomposing organisms which feed on dead remains of plants and animals.
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Question 1081 Mark
Name the two forms of reservoirs of carbon that regulate the ecosystem carbon cycle.
Answer
Dissolved carbon in oceans and carbon in rocks, sediments and fossils are the two forms of carbon reservoirs.
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Question 1091 Mark
Where is the reservoir for gaseous type of biogeochemical cycle located?
Answer
It is in the atmosphere.
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Question 1101 Mark
In the following table the ecological units are mentioned in the first column vertically and their attributes are mentioned horizontally. Match the ecological units and its attribute and put a tick in the blank with the table:
Attribute $\rightarrow$
Ecological Unit $\downarrow$
Age
Flow of Energy
Natality
Predator prey relationship
Individual organism
 
 
 
 
Population
 
 
 
 
Commupity
 
 
 
 
Ecosystem
 
 
 
 
Answer
Attribute $\rightarrow$
Ecological Unit $\downarrow$
Age
Flow of Energy
Natality
Predator prey relationship
Individual organism
$\checkmark$
 
 
 
Population
 
 
$\checkmark$
 
Commupity
 
 
 
$\checkmark$
Ecosystem
 
$\checkmark$
 
 
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Question 1111 Mark
Name the natural reservoir of phosphorus and the form in which it is present.
Answer
  1. Rocks are the natural reservoir of phosphorus.
  2. It is present in the form of phosphates.
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Question 1121 Mark
What is meant by species composition in an ecosystem?
Answer
Species composition refers to all the plant, animal and microbial species present in a given ecosystem.
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Question 1141 Mark
What does 'R' represent in the given equation for productivity in an ecosystem?
GPP - R = NPP
Answer
In the given equation for productivity in an ecosystem, GPP-R= NPP. 'R' represents the energy utilised by plants or producers in respiration. It is also referred to as respiration losses.
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Question 1151 Mark
What is the starting point of a grazing food chain and of a detritus food chain? 6. Why is a food web formed in nature?
Answer
Producers and dead organic matter, respectively.
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Question 1161 Mark
Name the two forms of reservoir of carbon, that regulate the ecosystem carbon cycle.
Answer
  1. Dissolved carbon in oceans.
  2. Carbon in fossil fuels.
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Question 1171 Mark
What is 'stratification' in an ecosystem?
Answer
'Stratification' in an ecosystem refers to the vertical distribution of different species occupying different levels.
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Question 1181 Mark
Define the term transducers.
Answer
Producers are also called transducers because they are able to change radiant or light energy into chemical form.
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Question 1191 Mark
In the North East region of lndia, during the process of jhum cultlvation, forests are cleared by burning and left for regrowth after a year of cultivation. How would you explain the regrowth of forest in ecological terms?
Answer
It is secondary succession.
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Question 1201 Mark
What is meant by humification?
Answer
The process of formation of humus from detritus or organic matter is called humification.
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Question 1211 Mark
Define food chain.
Answer
It is referred to the transfer of energy (food) from the producers through a series of consumers.
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Question 1221 Mark
What is the approximate value of net primary productivity of the biosphere?
Answer
170 billion tons of (dry weight) organic matter.
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Question 1231 Mark
Write a difference between net primary productivity and gross primary productivity.
OR
How is net primary productivity different from gross primary productivity?
Answer
A difference between c and gross primary productivity is:
S. No.
gross primary productivity.
net primary productivity
1.
It is the rate of production of biomass/organic matter by producers during photosynthesis.
It refers to the biomass/ organic matter available for the consumption to heterotrophs, left after some respiratory losses.
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Question 1241 Mark
Define climax community.
Answer
The community established at the terminal stage of succession, is called climax community.
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