Ecosystem

Ecosystem is formed by:
1. biotic and abiotic conditions
2. communities of all organisms
3. abiotic environment.
Ecosystems are:
1. overland and water
2. communities of all organisms
3. abiotic environment.
Ecosystem is:
1. basic structural and functional unit of nature
2. the basic unit of the abiotic component
3. the basic unit of the biotic component
The balance of the ecosystem can be impaired (by):
1. human activities
2. only when biotic components are disturbed
3. it cannot be disturbed
Relationships between biotic components consist of:
1. organisms
2. inanimate nature
3. human
Ecosystems can also be divided into:
1. natural and artificial
2. contemporary and historical
3. natural
In natural ecosystems life is dependent on:
1. only a solar energy
2. an additional energy
3. a solar and additional energy
Artificial ecosystems are not connected with:
1. a lake, a mountain stream
2. a field, a mountain meadow
3. a brook, a park
The balance of the ecosystem is much affected by:
1. human activities
2. biotic components and relations between them
3. abiotic components
Inserted additional energy:
1. increases production
2. is beneficial to the landscape
3. improves the appearance of natural ecosystems