Assertion $(A):$ $A$ natural ecosystem is usually self-sustainable.
Reason $(R):$ An ecosystem having producers,decomposers,and a source of energy is self-sustainable. Select the correct answer from the options given below:

  • A
    Both assertion and reason are true and reason is the correct explanation of assertion
  • B
    Assertion is true but reason is false
  • C
    Both assertion and reason are false
  • D
    Both assertion and reason are true but reason is not the correct explanation of assertion

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$A$: In hydrosere,the reed swamp stage is followed by the floating plant stage.
$R$: The sedge meadow stage has amphibious herbaceous plants.

How many statements are correct?
$(a)$ Some animals like cockroaches,crows,etc.,are omnivores.
$(b)$ Detritus food chain $(DFC)$ begins with dead organic matter.
$(c)$ Each trophic level has a certain mass of living material at a particular time called as standing crop.
$(d)$ Species composition and stratification are two main structural features of an ecosystem.

Which of the following is a producer in the plant kingdom?

Biogeochemical cycles can be traced in

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