CBSE
Multiple Choice QuestionsAssertion: A network of food chains existing together in an ecosystem is known as a food web.
Reason: An animal like kite cannot be a part of a food web
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
What is PAR range?
200 nm - 800 nm
400 nm - 700 nm
350 nm - 550 nm
600 nm - 100 nm
Which one of the following correctly represents an organism and its ecological niche?
Vallisneria and pond
Desert locust (Scistocerca) and desert
Plant lice (aphids) and leaf
Vultures and dense forest
Assertion : Secondary succession takes place in recently denuded area.
Reason : It is caused due to baring of an area.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Most animals that live in deep oceanic waters are
tertiary consumers
detritivores
primary consumers
secondary consumers
Assertion: The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity.
Reason: Gross primary productivity is the rate of net production of organic material (biomass).
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
The bacteria which attack dead animals are
first link of the food chain and are known as primary producers
second link of the food chain and are herbivorous
third link of the food chain and are tertiary consumers
the end of food chain and are decomposers.
Rain is called acid - rain when its pH is below
7
6.5
6
5.6
What is the Greek word for ecology?
Ethology
Oekologie
Synecology
Hexicology
Assertion: In a terrestrial ecosystem, detritus food chain is the major conduit for energy flow.
Reason: Solar energy is the direct source for energy supply in a detritus food chain.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
