Ecosystem - Online Test

Q1. Xerosere that begins on sand is called:
Answer : Option C
Explaination / Solution:

A psammosere is a seral community, an ecological succession that began life on newly exposed coastal sand. Most common psammoseres are sand dune systems.

Q2. Which of the following represents an incorrect feature of ecological succession:
Answer : Option A
Explaination / Solution:

Ecological succession gradually results into gradual increase in the biomass as new species having complex plant body replace the older species. Thus, the biomass increase at each stage of succession.

Q3. The individual transitional communities to inhabit an area are commonly called as:
Answer : Option C
Explaination / Solution:

A seral community (or sere) is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community. In many cases more than one seral stage evolves until climax conditions are attained. seral communities leads to climax communities.

Q4. Primary consumer category in aquatic &/or terrestrial ecosystem will include :
Answer : Option D
Explaination / Solution:

Primary consumers obtain food from producers or autotrophs. In aquatic ecosystem phytoplankton are main prouder and zooplankton are primary consumers along with frog tadpole , snail and tortoise.

Q5. Examples of local and global nutrient cycles will be:
Answer : Option B
Explaination / Solution:

Phosphorus cycle occurs at local level in an ecosystem as it is mainly derived from soil. Carbon cycles occurs through environment and affected by different ecosystem present on earth surface. So, carbon cycle is global in nature.

Q6. Successive transitional communities will show
Answer : Option D
Explaination / Solution:

During ecological succession, transitional communities or seral communities will show increase in the number of species due to addition of nutrient medium at successive stages of succession.

Q7. The ecological niche of an organism will not represent
Answer : Option B
Explaination / Solution:

Ecological niche is the area surrounding an organisms that help them in survive, grow and reproduce. The ecological niche of an organism represents the position and the role played by the organism in the ecosystem in which it lives. The ecological niche of an organism will not represent resources it cannot utilize.

Q8. In which of the following places, succession will occur in short time
Answer : Option B
Explaination / Solution:

Succession will occur in short time in heavily overgrazed pasture. If organic compound are already available in the place new organisms will develops faster as compare to bare land without organic matter.

Q9. Phosphorus will not make part of
Answer : Option A
Explaination / Solution:

Phosphorus is not present in amino acids. Nucleic acids, ATP and Teeth contain phosphorus. Amino acids polymerases to form protein.

Q10. An ecological succession on bare land proceeds towards
Answer : Option B
Explaination / Solution:

An ecological succession on bare land proceeds towards increasing wetness. Availability of water help in faster growth of organism including plants.