Embibe Experts Solutions for Chapter: Ecosystem, Exercise 3: Level 3

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops, will be having:

Select the option that correctly identifies A, B, and C in the given table.

Organism	Trophic level	Food chain
Eagle	$\mathrm{A}$	Grazing
Earthworm	Primary consumer	$\mathrm{B}$
Frog	$\mathrm{C}$	Grazing

	A	B	C
(i)	Top carnivore	Detritus	Secondary consumer
(ii)	Top carnivore	Detritus	Primary consumer
(iii)	Secondary consumer	Grazing	Secondary consumer
(iv)	Scavenger	Grazing	Producer

Read the following statements on ecological succession.

(a) Both hydrarch and xerarch successions lead to hydric and xeric conditions, respectively.

(b) The species that invades a bare area is called a transitional community.

(c) Niche becomes specific and narrower.

(d) Mosses are pioneer communities in hydrarch succession.

How many of the above statements are not correct?

During ecological succession:

An ecosystem resist change because it is in a state of

Identify the following statements as true (T) or false (F) for climax community and choose the option accordingly.

A. It is last community in biotic succession.

B. It is less stable than transitional communities.

C. It is in near equilibrium with the environment of that area.

D. It has a simple food chain and food webs.

Given below is a phosphorus cycle. Select the incorrect statements from the following.
 

(i) It represents phosphorus cycling in an aquatic ecosystem.
(ii) It represents phosphorus cycling in a terrestrial ecosystem.
(iii) The natural reservoir of phosphorus is forest rocks.
(iv) There is a respiratory release of phosphorus into the atmosphere.
(v) Gaseous exchange of phosphorus between organisms and the environment does not occur.

Assertion ($\mathrm{A}$): A primary succession is more common than secondary succession.

Reason ($\mathrm{R}$): Biogeochemical cycling is absent in secondary succession.