Flashcards: Ecosystem | Biology Class 12 - NEET PDF Download

 Page 1


E c o s y s t e m
Flash cards
Page 2


E c o s y s t e m
Flash cards
E c o s y s t e m is a functional unit of nature and comprises abiotic
and biotic components.
Page 3


E c o s y s t e m
Flash cards
E c o s y s t e m is a functional unit of nature and comprises abiotic
and biotic components.
Many ecologists regard the entire biosphere as a global
ecosystem, as a composite of all local ecosystems on Earth.
 It is convenient to divide it into two basic categories,
namely the terrestrial and the aquatic. 
Forest, grassland and desert are some examples of
terrestrial ecosystems.
Pond, lake, wetland, river and estuary are some examples
of aquatic ecosystems. 
Page 4


E c o s y s t e m
Flash cards
E c o s y s t e m is a functional unit of nature and comprises abiotic
and biotic components.
Many ecologists regard the entire biosphere as a global
ecosystem, as a composite of all local ecosystems on Earth.
 It is convenient to divide it into two basic categories,
namely the terrestrial and the aquatic. 
Forest, grassland and desert are some examples of
terrestrial ecosystems.
Pond, lake, wetland, river and estuary are some examples
of aquatic ecosystems. 
Vertical distribution of different species occupying different
levels is called stratification. In forest, trees occupy top
vertical part, shrubs the second and herbs and grasses
occupy the bottom layer.
Page 5


E c o s y s t e m
Flash cards
E c o s y s t e m is a functional unit of nature and comprises abiotic
and biotic components.
Many ecologists regard the entire biosphere as a global
ecosystem, as a composite of all local ecosystems on Earth.
 It is convenient to divide it into two basic categories,
namely the terrestrial and the aquatic. 
Forest, grassland and desert are some examples of
terrestrial ecosystems.
Pond, lake, wetland, river and estuary are some examples
of aquatic ecosystems. 
Vertical distribution of different species occupying different
levels is called stratification. In forest, trees occupy top
vertical part, shrubs the second and herbs and grasses
occupy the bottom layer.
There is u n i d i r e c ti o na l movement of energy.
When energy flows from a particular trophic level to the
next trophic level, some energy is always lost as heat at
each step.