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Alien species introduced into lake Victo...

Alien species introduced into lake Victoria that was responsible for extinction of cichlid species is :

A

African Catfish

B

Murrels

C

Water Hyacinth

D

Nile Perch

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Adaptation of a species is its:

The major reason for extinction of species is:

Assertion : The Nile perch introduced into lake Victoria in east Africa led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake. Reason : When alien species are introduced deliberately for economic or other uses, they often become invasive and cause extinction of indigenous species. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

New species develop due to:

Introduction of alien species into new area poses a threat to extinction of indigenous species due to (a) their high nutrient requirement (b) their symbiotic relationship (c) absence of their natural predators (d) more intraspecific competition.

What are species?

Ecological study of single species is :

Write definition of Species diversity

USHA PUBLICATION-ORGANISMS AND ENVIRONMENT-EXERCISE
  1. Geographic limit within which a population exists is called :

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  2. The species though insignificant in number determines the existence of...

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  3. Alien species introduced into lake Victoria that was responsible for e...

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  4. Figs belong to :

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  5. A phenomenon when parasite parasitizes another parasite is :

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  6. Bell - shaped polygonal pyramid indicates :

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  7. Which is appropriately defined ?

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  8. Predtaion perform all . Except

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  9. Parasitic phanerogams absorb water and solute from host plant by :

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  10. Microscopic aquatic organisms lacking locomotory ability and drifting ...

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  11. Two important factors that influences the life of organisms are

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  12. Under unfavourable conditions many zooplankton species in lakes and po...

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  13. Select the correct pair of adaptations in desert lizards : ( A ) Burro...

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  14. Ecology describes

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  15. Monarch Butterfly is not eaten by predators because of :

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  16. A logistic growth curve depicting population that is limited by carryi...

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  17. population with natality equal to mortality is :

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  18. Sigmoid // logistic growth curve is represented by :

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  19. A population growing in a habitat with limited resources shows four ph...

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  20. Which one is parasite in true sense ?

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