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251.

Type of relationship in which one organism is benefitted while there is no effect on other:

A.	Symbiosis	B.	Commensalism
C.	Mutualism	D.	Parasitism

252.

The following show commensalisms:

A.	Sea anemon, hermite crab	B.	Bird and rhino
C.	Butter fly and sunflower	D.	Liver fluck and sheep

253.

A lake with nutrients is called:

A.	Trophic	B.	Eutrophic
C.	Oligotrophic	D.	Euphotic

254.

In which type of the forest, humus is formed by the dry and dead leaves:

A.	Coniferous forest	B.	Alpine
C.	Tundra forest	D.	Deciduous forest

255.

Mark the correct statement:

A.	Locusts migrate for feeding occasionally	B.	Whales show periodic migration
C.	Many birds migrate from Siberia to South pole	D.	Arctic term migrate from North to South pole

256.

Aquatic photostratifraction in increasing depth order:

A.	Euphotic, disphotic and aphotic	B.	Aphotic, euphotic and disphotic
C.	Euphotic, aphotic and disphotic	D.	Disphotic, euphotic and aphotic

257.

Which one of the following is well-developed in hydrophyte?

A.	Aerenchyma	B.	Collenchyma
C.	Stomata	D.	Root system

258.

Microorganism living in our intestine and feeding on excreta is:

A.	Mutualism	B.	Symbiosis
C.	Co-operation	D.	Commensalism

259.

Which one of the following is not a matching pair of certain organism/s and the kind of association?

A.	Shark and sucker fish-commensalism	B.	Algae and fungi in lichens-parasitism
C.	Orchids growing on trees-epiphytism	D.	Cuscuta (doder) growing on other flowering plants-epiphytism

260.

Submerged hydrophytes have well developed:

A.	Vascular system	B.	Aerenchyma
C.	Root system	D.	Stoma