81.

Most animals that live in deep oceanic waters are

• tertiary consumers

• detritivores

• primary consumers

• secondary consumers

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

What is the Greek word for ecology?

• Ethology

• Oekologie

• Synecology

• Hexicology

Rain is called acid - rain when its pH is below

• 7

• 6.5

• 6

• 5.6

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

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.

What is PAR range?

• 200 nm - 800 nm

• 400 nm - 700 nm

• 350 nm - 550 nm

• 600 nm - 100 nm

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

Assertion: 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.

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