Home
Class 12
BIOLOGY
Which of the following fish led to the e...

Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichild fish in the lake Victoria of E.Africa ?
(a) Catla catla
(b) Dog fish
(c) Nile perch
(d) African catfish

A

Catla catla

B

Dog fish

C

Nile perch

D

African catfish

Text Solution

Verified by Experts

The correct Answer is:
C

Nile Perch (a predator fish) was introduced in lake Victoria of East Africa. It killed and eliminated ecoligically unique assemblage of over 200 native species of small cichild fish.
Promotional Banner

Similar Questions

Explore conceptually related problems

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.

Which one of the following fish is being illegally introduced for aquaculture purposes and is posing a threat to the indigenous catfishes of Indian rivers? (a) Clarias gariepinus (b) Nile perch (c) climbing perch (d) Protopterus

Around 200 types of Cichlid fish species became extinct because of introduction of Nile Perch, an invasive and alien species in

Which of the following statements regarding the estimates of number of species found on earth is not correct ? (a) Total number of species present on earth are considered to be about 7 million as estimated by Robert May. (b) Plants constitute more than 70% of all the species recorded, whereas animals constitute less than 22% of the total number of species. (c) Insects constitute more than 70% of all the animal species. (d) None of these

Which of the following statements regarding biodiversity hotspots are incorrect? (i) High endemism (ii) High level of species richness (iii) Total number is 34 in the world (iv) Five of these occur in India (v) High alien species invasion (vi) Cover less than 2% of the earth's land area, but if properly conserved, they can reduce extinctions by about 30% (a) (i) and (ii) (b) (iv) and (v) (c) iv), (v) and (vi) (d) (iii), (iv), (v) and (vi)

Introduction of Nile Perch in lake Victoria of South Africa resulted in (a) Excessive growith of water weeds (b) Eliminations of water weeds (c) Elimination of many species of cichild fish (d) Excessive growth of cichild fish.

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this? a) Lots of urea and phosphate fertilizer were used in the crops in the vicinity b) The area was sprayed with DDT by an aircraft c) The lake water turned green and stinky d)Phvtoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in this lake?

Given below are some of the common examples of spcies interaction Catagorise them into predation commensalism mutualism parasitism or competition. a. Egret foraging close to grazing cattle B.Fig flowers polinated by wasp c. Cuckoo laying egg in crow's nest d. Phytophagous insects feeding on a plant. e Clown fishes living among sea anemone. f. Abingdon tortoise in Galapagos islands became extinct withim a decade after goats were intorduced on the island.

Read the following statement (A-E) and answer the question which follows them (A) In Livewords, mosses, and ferns gametophytes are free - living . (B) Gymnosperms and some ferns are heterosporous. (C )Sexula reproduction in Fucus, Volvox and Albugo is oogamous. (D) THe sporophte in liverworts is more elaborate than that in mosses. (E) Both, Pinus and Marchantia are Dioecious. How many of the above statement are correct